Thông số kĩ thuật siemens monitoring devices

11/1

11

Monitoring Devices

11/2 Introduction

11/5 5TT3 46 fault signaling units

11/7 7LQ2 1, 5TT3 3 dusk switches

11/10 7LQ2 0 temperature controllers

11/13 5TT3 170 fuse monitors

11/15 5TT3 171 line circuit relays

11/17 5TT3 42 phase/phase sequence monitors

11/19 5TT3 1 and 5TT3 4 voltage relays

11/26 5TT6 1 current relays

11/32 5TT6 10 priority switches

11/34 5TT3 47 insulation monitors for industrial applications

11/37 7LQ3 35 insulation monitorsfor medical premises

11/45 5TT3 472 p.f. monitors

11/47 5TT3 435 level relays

11/50 5TT3 43 thermistor motor protection relays

11/52 5TT7 1 GSM alarm modules

Monitoring Devices

Introduction

11/2 Siemens ET B1 T · 2007

Overview

Devices Application Standards Usage

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Fault signaling units

• 5TT3 460 centralized fault signaling units Evaluation and display of fault alarms and alarm signals for monitoring indus-trial plants and control systems

IEC 60255, DIN VDE 0435-303

-- • 5TT3 461 expansion fault signaling units --

Dusk switches For demand-oriented switching of light-ing installations for shop windows or paths in order to cut costs

EN 60730 --7LQ2 1, 5TT3 3

Temperature controllers Controlling and limiting of temperatures

EN 60730 7LQ2 0

Fuse monitors5TT3 170

Monitoring of all types of melting fuses IEC 60255, DIN VDE 0435

--

Main isolating relays5TT3 171

Shutdown of unused lines IEC 60255, DIN VDE 0435

-- --

Phase/phase sequence monitors5TT3 421/5TT3 423

Monitoring of the phase sequence of a system and the power supply

IEC 60255, DIN VDE 0435

-- --

monitoring devices

Monitoring Devices

Introduction

11/3Siemens ET B1 T · 2007

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Voltage relays

• Undervoltage relays5TT3 400 to 5TT3 403

Monitoring of the power supply of emergency lighting in public buildings

IEC 60255, DIN VDE 0435-303,DIN VDE 0108

-- --

• Undervoltage relays5TT3 404 to 5TT3 406

-- --

• Short-time voltage relays5TT3 407

Monitoring of the power supply for short-time failures of 20 ms

– -- --

• Under/overvoltage relays5TT3 408

Monitoring of the power supply for ensuring operational parameters for devices or system components

IEC 60255, DIN VDE 0435

-- --

• Under/overvoltage relays5TT3 410

Monitoring of the neutral conductor for breaks

DIN VDE 0633 --

• Overvoltage relays5TT3 19

Monitoring of the power supply for ensuring operational parameters for devices or system components

IEC 60255, DIN VDE 0435

-- --

Current relays 5TT6 1

Monitoring of emergency and signal lighting and motors

IEC 60255, DIN VDE 0435-303

--

Priority switches5TT6 10

Switching of system loads in residential buildings

IEC 60669 (VDE 0632),BTO § 6 Clause 4

-- --

Insulation monitors for industrial applications

Monitoring of the insulation resistance in non-grounded systems

IEC 60255, IEC 61557

-- --

5TT3 4

Insulation monitors for medical premises7LQ3 350

For monitoring the insulation resistance in non-grounded systems on medical premises

EN 61557-8 (VDE 0413 Part 8) IEC 61557-8:1997-02EN 61557-8:1997-03DIN VDE 0100-710 (VDE 0100, Part 710):2002-11ÖVE-EN 7-1991ASTMF12071996-00IEC 60364-7-710:2002-11

-- --

Signaling and test combinations7LQ3 351

For displaying operation and fault signals of the insulation monitor

IEC 60364-7-710:2002-11 DIN VDE 0100-710 (VDE 0100, Part 710):2002-11

-- --

Power supply units7LQ3 352

For powering a max. of 3x 7LQ3 351 signaling and test combinations

IEC 60742:1983 + A1:1992, modified, EN 60742:1995-09 EN 61558-1:1997-07 IEC 61558-1:1997, modified

-- --

Measuring current transformers7LQ3 353

7LQ3 353 measuring current transform-ers for monitoring power supplies on medical premises. They record the load current and convert it into a usable signal for evaluation devices

EN 60044-1:2001-11 Measuring transformers – Part 1: Current transformers (IEC 60044-1:1999 + A1:2000), German versionEN 60044-1:2001-11

-- --

P.f. monitors For monitoring of the underload of motors up to approx. 5 A AC by making p.f. measurements

IEC 60255 -- -- 5TT3 472 IEC 61557

Monitoring Devices

Introduction


DefinitionsIe = Rated operational currentUe = Rated operational voltageIc = Rated control currentUc = Rated control voltagePs = Rated operational power1 MW = 18 mm modular width

Transparent caps

Adding a transparent cap extends the 55 mm mounting depth of a device to 70 mm. This is a useful option for improving the appear-ance of a distribution board.


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Level relays5TT3 430/5TT3 435

Control of liquid levels in containers IEC 60255, DIN VDE 0435

--

Thermistor motor protection relays5TT3 43

Thermal protection of motor windings

IEC 60255, DIN VDE 0435

-- --

GSM alarm modules Mobile monitoring and switching of system components

Monitoring Devices

5TT3 46 fault signaling units


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Overview

• 4 fault signal inputs with LED• 1 LED as centralized fault indicator• One unit each for centralized fault indication and acoustic

signaling• With acknowledgment for acoustic indicators• Open-/closed-circuit principle to the 4 inputs can be set via

jumpers X1-X2• A maximum of 39 5TT3 461 expansion fault signaling units can be

connected to the 5TT3 460 centralized fault signaling unit

• The maximum possible cable length between 5TT3 460 central-ized fault signaling units and 5TT3 461 expansion fault signaling units is approx. 100 m with a conductor cross-section of 1.5 mm2.

Function

A fault is indicated as a centralized fault at the LED, and a central-ized fault indication is initiated. The assigned LED remains lit until the fault is eliminated. Until the acknowledgment, momentary faults can be identified by the remaining centralized fault.

Technical specifications

Selection and ordering data

Dimensional drawings Schematics

Circuit diagrams

Data according to DIN VDE 0435-110, -303, IEC 60255 5TT3 460 5TT3 461

Rated control voltage Uc V AC 230

Operating range × Uc 0.8 ... 1.1

Rated frequency Hz 50/60

Fault signaling inputs S1... S4 V AC 230

Signal voltage to terminals S and H V 7 ... 10

Noise pulse duration ms ≥ 100

Acknowledgment pulse duration ms ≥ 200

Rated operational voltage Ue V AC 230 --

Rated operational current Ie A 5 --

Minimum contact loads V/mA 10/100 --

Terminals 1 screw (Pozidriv) 1

Conductor cross-sections rigid max. mm2 2 × 2.5flexible with sleeve min. mm2 1 × 0.5

Permissible ambient temperature °C -20 ... +60

Humidity class acc. to IEC 60068-2-30 F

Ue Ie Uc MW Order No. Weight1 unitapprox.

PS*/P. unit

V AC A V AC kg Unit(s)

Centralized fault signaling units with transparent cap

230 5 230 2 5TT3 460 0.130 1

Expansion fault signaling units with transparent cap

230 2 5TT3 461 0.110 1

5 4364

45 90

I2_1

1511

A2

36

14 A

13 X1

24 QH 2

36

S HA1

X2

S1 S2 S3 S4

S HA1

S1 S2 S3 S4

X123 X2

5TT3 460 5TT3 461

5TT3 460 5TT3 461

* You can order this quantity or a multiple thereof.

Monitoring Devices

5TT3 46 fault signaling units


Schematics

Switching example, function chart

The terminals A1, S1 to S4 and QH must be operated in-phase. If no external acknowledgment key is connected, terminal QH must be laid to L1.If jumper X1/X2 is fitted, open-circuit protection (otherwise closed-circuit protection).Contacts 13/14 and 23/24 close in the event of an incoming fault. The assigned LED and the centralized fault indication LED SM light up.The alarm sensor (contact 13/14) is switched off using the acknowl-edgment key. The assigned LED and the centralized fault indication LED continue to light up and contact 23/24 remains closed until the fault is eliminated.Cables S and H carry an extra-low voltage. In the case of long con-nections between different distribution boards a shielded cable must be laid parallel to the installed load lines.As a light signal sensor for the group messages, we recommend devices 5TE5 7 or 5TE5 8; as alarm sensor, the devices 5TT3 450 to 5TT3 453.

A1 A2

L1

N

13 23 S1 S2 S3 S4 A1 A2 S1 S2 S3 S4

X1 X2 S HX1 X2 S H

QH

SM14 24

5TT3 460 5TT3 461

I2_07282bAC 230 V

FaultalarmFA

Acknow-ledgementkey

Working current Closed-circuitcurrent

A

I2_07283bFault 1

Fault 2

Central indicationrelay

Central indicationhorn

Acknowledge.horn

dark bright

A

Monitoring Devices

7LQ2 1, 5TT3 3 dusk switches


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Overview

Function

A light sensor measures the level of daylight. Switching depends on the desired brightness. A time delay and the switching hysteresis prevent clock-pulse behavior.The sensor must be mounted so that it is not influenced by thelighting (feedback).

Energy savingDusk switches are used for the demand-oriented switching of light-ing installations for shop windows or paths in order to cut operating costs.

A single light sensor serves several switching channelsThe devices 7LQ2 101 and 7LQ2 103 have 2 switching channels that can be set independently of each other. 12 of these devices can be switched parallel to a light sensor. This saves the multiple installation of light sensors in a single system. All switching channels operate independently of each other and can be adjusted individually.


7LQ2 100 7LQ2 101 7LQ2 102 7LQ2 103 5TT3 303

Setting ranges in lux 2 ... 500 2 x 2 ... 500 2 ... 500 2 x 2 ... 500 2 ... 2000

Adjustable time delay -- -- --

Switching status indication

Light sensor, max. cable length 50 m 50 m 50 m 50 m --

Switching channels 1 2 1 2 1

Incandescent lamp load 2000 W 2 x 2000 W 2000 W 2 x 2000 W 1200 W

Data according to EN 60730 7LQ2 100 7LQ2 101 7LQ2 102 7LQ2 103 5TT3 303


Operating range at 50/60 Hz × Uc 0.85 ... 1.15 0.85 ... 1.1

Rated frequency Hz 48 ... 62 50

Measuring ranges, setting ranges Lux 2 ... 500 2 × 2 ... 500 2 ... 500 2 × 2 ... 500 2 ... 2000

Time delay non-adjustable s 75 ± 25 no 75 ± 25 no 50adjustable no 2 × 50 ... 100 no 2 × 50 ... 100 no

Contacts µ contact 1 NO contact

2 NO contacts

1 NO contact

2 NO contacts

1 NO contact

Contact switching closes with approaching darkness

Terminals 3/4 5/6 and 9/10 3/4 5/6 and 9/10 no

Status indication, LED switching status indication instantaneous noswitching state OFF green noswitching state ON red no

Rated operational voltage Ue V AC 250

Rated operational current Is at p.f. = 1 A 16 10at p.f. = 0.4 A 4 2

Incandescent lamp load W 2 000 2 × 2 000 2 000 2 × 2 000 1 200

Different phases actuator/contact permissible yes yes yes yes nocontact/contact no yes no yes no

Electrical isolations creepage and clearancesactuator/contact mm 4 4 4 4 nocontact/contact mm no 4 no 4 no

Rated impulse withstand voltage Uimp actuator/contact kV > 2.5 > 2.5 > 2.5 > 2.5 no1.2/50 µs contact/contact kV no > 2.5 no > 2.5 no

Minimum contact loads V; mA 10; 100

Terminals +/- screw (Pozidriv) 1

Conductor cross-sections rigid mm2 1.5 ... 6 1.5flexible with sleeve min. mm2 0.75 0.5

Permissible ambient temperature device °C -10 ... +55 nolight sensor °C -30 ... +70 no

Permissible humidity device % < 80 nolight sensor % < 98 no

Resistance to climate according to DIN 50016 FW 24

Degree of protection according to EN 60529device IP20 IP54light sensor IP55 IP65 no

Safety class according to EN 61010 II

Monitoring Devices




Dimensional drawings


PS*/P. unit


7LQ2 100

Dusk switches

Setting range 2 ... 500 lux

1-channel version, with 7LQ2 910 light sensor for surface mounting, IP55

250 16 230 2 7LQ2 100 0.210 1

2-channel version, with 7LQ2 910 light sensor, for surface mounting, IP55expandable to 24 channels through parallel switching of 12 devices, which can be mutually controlled through a light sensor.

250 16 230 3 7LQ2 101 0.210 1

1-channel version, with 7LQ2 911 light sensor for flush wall mounting, IP65

250 16 230 2 7LQ2 102 0.210 1

7LQ2 103

2-channel version, with 7LQ2 911 light sensor, for flush wall mounting, IP65expandable to 24 channels through parallel switching of 12 devices, which can be mutually controlled through a light sensor.

250 16 230 3 7LQ2 103 0.210 1

5TT3 303

Setting range 2 ... 2000 lux

1-channel version, for surface mounting, IP55, with integrated light sensor

250 10 230 – 5TT3 303 0.190 1

Replacement light sensors

with watertight/resistant resin molding material, heat-resistant to 70 C

Degree of protection IP55, for 7LQ2 100 and 7LQ2 101,for surface mounting, 2 ... 500 lux

7LQ2 910 0.060 1

Degree of protection IP65, for 7LQ2 102 and 7LQ2 103,for flush wall mounting, 2 ....0 500 lux

7LQ2 911 0.060 1

7LQ2 1007LQ2 102

7LQ2 1017LQ2 103


Monitoring Devices



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Schematics

If the device measures a light level below the set value or if the device is no-voltage, the contacts are in the position shown.• If the surrounding light level increases by approx. 30 to 100 %

above the set value, the light is switched off after the set delay time. • If the surrounding light level falls below the set value, the light is

switched on after the set delay time.

5TT3 303 7LQ2 910

7LQ2 911

Wall-mounted version

#

6

6

Dusk switches7LQ2 1007LQ2 102

Dusk switches7LQ2 1017LQ2 103

Up to 12 dusk switches with a single sensor7LQ2 1017LQ2 103

The cable length between the device and the light sensor must not exceed a maximum of 50 m. The conductor cross-section must be a minimum of 2 x 0.75 mm².

Up to 12 dusk switches can be operated with a single sensor

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Monitoring Devices

7LQ2 0 temperature controllers

11/10 Siemens ET B1 T · 2007

Overview

Application

The temperature controllers are used for controlling or limiting tem-peratures in residential and non-residential buildings, as well as in industrial areas. They're used for heating registers, panel and hot air heating and direct floor heating, as a limiting thermostat for air-con-ditioning systems and cooling systems, switchgear cabinet cooling, etc. as well as for temperature control in humid and dusty rooms. Can also be used for inaccessible room temperature setting for rooms in public buildings, such as schools, dayrooms and compa-rable applications.

Function

Electronic 2-element temperature controllers with LED red/green for voltage indication, switching status indication and temperature sen-sor monitoring. The temperature sensor with the measuring element KTY or a PT100 measuring element is monitored for short circuits and interruptions.


7LQ2 001 7LQ2 002 7LQ2 003 7LQ2 005

Setting ranges in °C -30 ... +30 0 ... +60 +40 ... +100 +2 ... +400

Switching status indication

Adjustable switching hysteresis in °C 1 ... 5 1 ... 5 1 ... 5 1 ... 20

Temperature sensor, measuring element KTY 11-6 KTY 11-6 KTY 11-6 for PT100

Max. cable length 100 m 100 m 100 m 100 m

Data according to EN 60730 7LQ2 001 7LQ2 002 7LQ2 003 7LQ2 005


Operating range at 50/60 Hz × Ue 0.85 ... 1.15

Rated frequency Hz 48 ... 62

Measuring ranges, setting ranges °C -30 ... +30 0 ... +60 +40 ... +100 2 ... +400

Switching hysteresis adjustable °C 1 ... 5 4 ... 20

Contacts µ contact 1 CO

Contact switching closes with increasing temperature Terminals 3/4

Status indication, LED switching status indicationactuating voltageswitching state ONbreak or short-circuit ofsensor conductor

greenredred flashing


Rated operational current Is at p.f. = 1at p.f. = 0.4

AA

164

Different phases actuator/contact permissible Yes

Electrical isolations creepage and clearances actuator/contact mm 4

Rated impulse withstand voltage Uimp1.2/50 µs

actuator/contact kV > 2.5

Minimum contact loads V; mA 10; 100

Terminals ± screw (Pozidriv) 1

Conductor cross-sections rigidflexible with sleeve

mm2

min. mm21.5 ... 6 0.75

Permissible ambient temperature devicetemperature sensor

°C°C

-10 ... +55-30 ... +105

-10 ... +55–

Permissible humidity devicetemperature sensor

%%

≤ 80≤ 98

≤ 80–

Degree of protection according to EN 60529device IP20 IP20temperature sensor IP65 –

Safety class according to EN 61010 II

Monitoring Devices



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Characteristic curves


PS*/P. unit


7LQ2 001

Temperature controllers

With KTY 11-6 temperature sensor

Setting range -30 ... +30 °C, 1 CO contact250 16 230 2 7LQ2 001 0.210 1

Setting range 0 ... +60 °C, 1 CO contact

250 16 230 2 7LQ2 002 0.210 1

Setting range +40 ... +100 °C, 1 CO contact

250 16 230 2 7LQ2 003 0.210 1

Temperature controllers without temperature sensor

For PT 100 measuring element (not included in delivery)

Setting range +2 ... +400 °C, 1 CO contact

250 16 230 2 7LQ2 005 0.210 1

KTY 11-6 replacement temperature sensors

Safety class IP65, for 7LQ2 001, 7LQ2 002 and 7LQ2 003, encapsulated, with watertight/resistant resin material, with 1 m silicone line, heat-resistant up to 105 °C, can be extended up to 100 m

230 7LQ2 900 0.040 1

Resistor characteristic curves KTY11-6 Resistor characteristic curves PT100 according to EN 60751 (96)


Monitoring Devices


11/12 Siemens ET B1 T · 2007


Schematics

Switching examples

7LQ2 00. 7LQ2 900

7LQ2 0 temperature controllers in cooling operation with adjustable functioning temperature difference

7LQ2 0 temperature controllers in cooling operation with adjustable functioning temperature difference

The cable length between the device and the temperature sensor must not exceed a maximum of 100 m. The conductor cross-section must be a minimum of 2 x 0.75 mm².

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Monitoring Devices

5TT3 170 fuse monitors


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Overview

• For all fuse systems• Signal is output even when load is shut off• Also suitable for asymmetrical networks, networks with harmonics

or motors with feedback• With two display LEDs, 1 for "Fuse OK" and 1 for "Fuse Failed"

Application

For the fuse monitoring of all kinds of melting fuses, in particular for the automatic shutdown and closing lockout of 3-phase AC motors in the event of the failure of one or more phase fuses.Note:The internal resistance of the measuring paths of the fuse monitor is in the MΩ range so that the VDE regulations with regard to touch voltage are met in the event of faulty fuses (>1000 Ω/V). To isolate, the main switch must be switched off. The enclosed label should be affixed to the switchgear as a reminder.



Data according to DIN VDE 0435-110, IEC 60255 5TT3 170

Rated control voltage Uc V 3x 380 ... 415


Rated frequency Hz 50 ... 400

Internal resistance of measuring paths Ω/V > 1000

Max. permissible rear feed % 90

Response/release time ms < 50

Rated impulse withstand voltage Uimp input/output kV > 4


Rated operational current Ie AC-1 A 4

Electrical service life in switching cycles at 1 A 1.5 × 105

AC-11




Resistance to extreme climates according to EN 60068-1 20/45/4


PS*/P. unit

V AC A V kg Unit(s)

Fuse monitors with transparent cap

for all low-voltage fuse systems.Can be used in asymmetric systems afflicted with harmonics and regenerative feedback motors. Alarm also for disconnected loads.

230 4 3x 380 ... 415 2 5TT3 170 0.150 1


Monitoring Devices

5TT3 170 fuse monitors

11/14 Siemens ET B1 T · 2007


Schematics

Circuit diagram

Switching example, function chart

If the fuse fails, the motor is immediately disconnected (prevention of 2-phase run). After changing the fuse, the motor can be restarted by pressing the "ON" button. Unlike conventional motor circuit-breakers, it is not possible to switch the motor on, if the fuse is faulty.Note:The internal resistance of the measuring paths of the fuse monitor is in the MΩ range so that the VDE regulations with regard to touch voltage are met in the event of faulty fuses (>1 000 Ω/V). To isolate, the main switch must be switched off. The enclosed label should be affixed to the switchgear as a reminder.

36

L1 L2 L3

14

L1 L2 L3

15

5 4364

45 90

I2_1

1512

M

N

L2

L1 L2 L3

13

I2_07251a

3 ~

L1 L3

L2' 14L1' L3'

L

F1 F2 F3

Off

On

A

Monitoring Devices

5TT3 171 line circuit relays


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Overview

• Adjustable from 2 to 20 VA• With status display for contact position• With switch continuously ON• With safety information on stickers for socket outlets and distribu-

tion boards

Application

For disconnecting the voltage or field circuit of electrical systems even when loads are disabled.

The line circuit relay switches off the system component, but is not a device for ensuring isolation in the sense of safe disconnection.

Function

If loads are disconnected manually, and if the line circuit relay mea-sures a usage of only 2 to 20 VA (adjustable), it disconnects the ca-ble to the supply voltage and switches over to extra-low voltage. As soon as loads are reconnected, the line circuit relay detects the in-crease in usage and switches back to the supply voltage. It detects resistive, capacitive and inductive loads.The line circuit relay is unable to detect consumers with electronic power supply units, e.g. electronically controlled vacuum cleaners. It is expedient to connect such equipment to a base load resistance (PTC resistor) so that the line circuit relay is reset to supply voltage.







Rated power dissipation Pv electronics VA 5contacts VA 2.6

Monitoring voltage V 3

Response value adjustable VA 2 ... 20

Release value % of the response value 70

Rated impulse withstand voltage Uimp input/output kV > 4


Rated operational current Ie AC-1 A 16AC-11 A 3

Contacts µ contact

Electrical service life in switching cycles at 3 A,AC-11

5 × 105




Degree of protection according to DIN 60529 IP20

Safety class according to EN 61140/ VDE 0140 Part 1 II

Humidity class according to IEC 60068-2-30 F


PS*/P. unit


5TT3 171

Line circuit relay with transparent cap

for disconnecting the voltage or field circuit of electrical systems even when loads are disabled.

1 NC contact 250 16 230 1 5TT3 171 0.072 1

Base load resistor for electronic devices

with 15-cm connection wires, end sleeves and shrink sleeving 5TG8 222 0.010 1


Monitoring Devices

5TT3 171 line circuit relays

11/16 Siemens ET B1 T · 2007

Dimensional drawings Schematics

Switching example

If the output falls to 2 to 20 VA (adjustable), the line circuit relay dis-connects the line from the system voltage and switches over to ex-tra-low voltage.Once consumption increases, it reconnects. An electronic load must be connected with the 5TG8 222 base load resistor.

L N

5 4318

I2_1

0775

64

45 90

L N

L1

N

PTC

i

I2_0

7036

aElec-tronic

A

230 V AC

Monitoring Devices

5TT3 42 phase/phase sequence monitors


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Overview• Phase monitors with 3-fold LED display• Phase sequence monitors with single LED display

Application

For visual detection/signaling of phase failures in a 3-phase system.The phase sequence is arbitrary. The device is also suitable for 1, 2 or 3-phase operation.Indication of phase sequence in 3-phase system.



Data according to DIN VDE 0435, IEC 60255 5TT3 421 5TT3 423

Rated control voltage Uc V AC 230/400 400



Rated power dissipation Pv electronics VA 9contacts VA 0.2


Rated operational current Ie A 4

Minimum contact load V/mA 10/100

Rated insulation voltage Ui between coil/contact kV 4

Contacts µ contact (AC-11) A 3

Electrical isolations creepage and clearancesactuator/contact mm 4

Rated impulse withstand voltage Uimp actuator/contact kV > 2.5


Conductor cross-sections rigid max. mm2 2 × 2.5flexible with sleeve min. mm2 –

Degree of protection according to EN 60529 IP20

Safety class according to EN 61140/ VDE 0140 Part 1

II




PS*/P. unit


Phase monitors with transparent cap

with 3 green LEDs for 3 phases

1 CO 250 4 230/400 1 5TT3 421 0.060 1

Phase sequence monitors with transparent cap

with one green LED, which lights up for right-rotating field

1 CO 250 4 400 1 5TT3 423 0.050 1


Monitoring Devices

5TT3 42 phase/phase sequence monitors

11/18 Siemens ET B1 T · 2007


Schematics

Circuit diagrams

Switching examples

5TT3 421 phase monitorsThe phase monitor can be operated either in 1, 2 or 3-phase opera-tion.

5TT3 423 phase sequence monitorsPhase sequence monitors must always be connected in 3-phase.

5 4364

45 90

18

I2_1

0780

18

L2

NL1

L3

1114

12

L2

L1

L3

14

12

11

5TT3 421 5TT3 423

5TT3 421 5TT3 423

14 12

11

I2_1

0776

L1 L2 L3 N

NL1

Single-phase operation

14 12

11I2_1

0777

L1 L2 L3 N

L1 L2 N

Two-phase operation

14 12

11I2_1

0778

L1 L2 L3 N

L1 L3L2 N

Three-phase operation

A

I2_1

0779

L1 L2 L3

L1 L2 L3

14 12

11

M

K1

PE

Monitoring Devices

5TT3 1 and 5TT3 4 voltage relays


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Overview

Application

General voltage monitoring For general device and plant protection, voltage relays with switch-ing thresholds of 0.7 x Uc, i.e. 161 V are used. If they have fixed, unchangeable switching thresholds, they switch back to normal operation at 0.85 Uc, 195 V or at 0.9 x Uc, 207 V, depending on the version. If they have adjustable threshold values, they switch back to normal operation with 4 % hysteresis, 9 V.

1, 2 or 3 phases against N or 3 phases against N All voltage relays require an N-conductor. Devices for 1, 2 or 3 phas-es against N can be used for 1, 2, or 3-phase operation. Devices for 3 phases against N require all three phases, whereby the sequence in which they are connected is irrelevant.

Asymmetry detectionIf different voltages occur in a 3-phase network, this is called phase asymmetry. Some voltage relays detect an asymmetry of approx. 6 to 8 % of the phase-to-neutral voltage, i.e. approx. 14 to 16 V and switch off. This type of operation is used to protect motors against a "skew" (for example).

N-conductor monitoringAn N-conductor break causes a skew, depending on the phase load. In extreme cases, this could cause 380 V to be applied to a phase and destroy the connected devices. Each voltage relay with asymmetry detection is tripped by an N-conductor break, if the phase displacement is at least 14 to 18 V.The 5TT3 410 N-conductor monitor detects a phase displacement of 5 %, which is roughly 12 V. This provides earlier protection against overvoltage for connected devices. The N-conductor monitor does not react if the voltage drops or rises in all phases simultaneously; or if a phase is swapped with the N-conductor.

Reverse voltage detectionIf a phase fails, the motors feed a reverse voltage to the missing phase. However, voltage relays with reverse voltage detection will disconnect in this case because they are monitoring the phase angle.

Phase failure detectionIf a phase fails completely, the voltage relays disconnect with a delay as specified in the technical specifications.

Short-time failure detectionShort-time failures upwards of 20 ms cannot be detected with conventional voltage relays. However, they can occur in the case of system transfers or lightning strikes and can lead to uncertainty for sensitive process sequences or measuring procedures. The 5TT3 407 short-time voltage relay has a reset function that allows a procedure to be permanently interrupted after a fault.

Series fuse 2 AThe voltage relays do not require a series fuse as device protection. However, they are often installed in junctions, i.e. in main supply sys-tems with high fusing. In this case, the supply lead to the voltagerelay must be short-circuit resistant. The series fuse only serves as line protection.

Monitoring of safety light devices DIN VDE 0108 requires that buildings/rooms where "people meet" have emergency lighting. Depending on what the rooms are used for the emergency lighting must be switched on after 0.5 to 15 s if the voltage falls 15 % below the rated voltage of 230 V, i.e. 195 V. This switching threshold must not be adjustable. The voltage relays for safety light devices react after 150 ms. At 5 % undervoltage, i.e. at 218 V, they switch back to normal operation.

Monitoring of medical premises according to DIN VDE 0107In the case of undervoltage, there is no guarantee that medical equipment will continue to function. Because of the risk this presents to patients, e.g. during operations, it is essential that systems switch to an emergency power supply in the event of undervoltage.

5TT3 5TT3 5TT3 5TT3 5TT3 5TT3 5TT3 5TT3 5TT3 5TT3 5TT3 5TT3194 195 400 401 402 403 404 405 406 407 408 410

General monitoring -- -- -- -- -- -- --

Monitoring of safety light devices -- -- -- -- -- -- -- -- --

Monitoring of medical facilities -- -- -- -- -- -- -- -- -- -- --

Monitoring of N-conductor -- -- -- -- -- -- -- -- -- -- --

Monitoring of short-time interruptions -- -- -- -- -- -- -- -- -- -- --

Overvoltage -- -- -- -- -- -- -- -- --

Undervoltage -- -- --

1, 2, 3-phase against N -- -- -- -- -- --

3 phases against N -- -- -- -- -- -- --

Asymmetry detection -- -- -- -- -- --

N-conductor monitoring -- -- -- --

Reverse voltage detection -- -- -- -- -- -- --

Short-time failure detection -- -- -- -- -- -- -- -- -- -- --

Phase failure detection --

Switching thresholds: -- -- -- -- -- -- -- -- -- -- -- --

0.7 / 0.9 x Uc, not adjustable -- -- -- -- -- -- -- -- --

0.8 / 0.85 x Uc, not adjustable -- -- -- -- -- -- -- -- -- -- --

0.85 / 0.95 x Uc, not adjustable -- -- -- -- -- -- -- -- --

0.7 ... 0.95 x Uc, 5 % hysteresis, adjustable -- -- -- -- -- -- -- -- -- -- --

0.7 ... 1.1 x Uc, 4 % hysteresis, adjustable -- -- -- -- -- -- -- -- -- -- --

0.9 ... 1.3 x Uc, 4 % hysteresis, adjustable -- -- -- -- -- -- -- -- --

Adjustable time delay -- -- -- -- -- -- -- -- -- -- --

Contact: 1 CO contact -- -- -- -- -- -- -- -- -- --

Contact: 2 CO contacts -- --

Monitoring Devices


11/20 Siemens ET B1 T · 2007


Data according to DIN VDE 0435-110, -303, IEC 60255 5TT3 400 5TT3 404 5TT3 406 5TT3 194 5TT3 1955TT3 401 5TT3 4055TT3 4025TT3 403

Rated control voltage Uc V AC 230/400 400

Operating range (overload capability) × Uc 1.1 1.35


Back-up fuse terminals L1/L2/L3 A 2

Response values × Uc ON-switching 0.9/0.95 4 % hysteresisOFF-switching 0.7/0.85 0.7 ... 0.95 0.9 ... 1.3


Phase asymmetry setting accuracy % -- approx. 5 ... 10 -- approx. 5 ... 10

repeat accuracy % -- 1 -- 1

Phase failure detection at L1 or L2 ms 100 140at L3 ms 100 30

N-conductor monitoring -- Yes --



Electrical isolations creepage and clearancesactuator/contact mm 3 5.5

Rated impulse withstand voltage Uimp actuator/contact kV > 2.5 > 4


Conductor cross-sections rigid max. mm2 2 × 2.5flexible with sleeve min. mm2 0.5



Data according to DIN VDE 0435-110, IEC 60255 5TT3 407 5TT3 408 5TT3 410

Rated control voltage Uc V AC 230/400

Operating range (overload capability) × Uc 1.1 1.35 1.2


Back-up fuse terminals L1/L2/L3 A 2

Response values × Uc overvoltage:OFF-switching -- 0.9 ... 1.3 Uc --ON-switching -- 4 % hysteresis --

undervoltage:OFF-switching 0.8 0.7 ... 1.1 Uc --ON-switching 0.85 4 % hysteresis --


Phase asymmetry setting accuracy % approx. 5 ... 10

repeat accuracy % 1

Phase failure detection at L1, L2 or L3 ms ≥ 20 100 --

OFF delay s -- 0.1 ... 20 --

Automatic reclosing delay s 0.2 ... 20 - --


Contacts µ contact (AC-11) A 3 1 4

Electrical isolations creepage and clearances contact/contact mm -- 4 --actuator/contact mm 4 5.5

Rated impulse withstand voltage Uimp actuator/contact kV > 4

Rated operational power Ps AC operation:230 V and p.f. = 1 VA 2 000 -- --230 V and p.f. = 0.4 VA 1 250 -- --

DC operation:Ue = 24 V and Ie = 6 A W max. 100 -- --Ue = 60 V and Ie = 1 A W max. 100 -- --Ue = 110 V and Ie = 0.6 A W max. 100 -- --Ue = 220 V and Ie = 0.5 A W max. 100 -- --


Conductor cross-sections rigid max. mm2 2 × 2.5flexible with sleeve min. mm2 0.5


Humidity class according to IEC 60068-2-30 F

Monitoring Devices



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34567891011121314151617



PS*/P. unit


5TT3 194

5TT3 400

5TT3 402

5TT3 404

5TT3 407

5TT3 408

Voltage relays with transparent cap

for general overvoltage monitoring of 1, 2 or 3 phases against N, with reverse voltage and phase failure detectionswitching thresholds: 0.9 ... 1.3 x Uc, 4 % hysteresis, adjustable

Contact, 2 CO contacts 230 4 230/400 2 5TT3 194 0.150 1

for general overvoltage monitoring of 3 phases against N, with asym-metry, reverse voltage and phase failure detection, with N-conductor monitoring, switching thresholds: 0.7 ... 0.9 x Uc, not adjustable


for general undervoltage monitoring of 1, 2 or 3 phases against N, with phase failure detection, switching thresholds: 0.7/0.9 x Uc, not adjustable

Contact, 1 CO contact 230 4 230/400 1 5TT3 400 0.065 1

for undervoltage monitoring of safety light devices of 1, 2 or 3 phases against N, with phase failure detection, switching thresholds: 0.85/0.95 x Uc, not adjustable

Contact, 1 CO contact 230 4 230/400 1 5TT3 401 0.065 1

for general undervoltage monitoring of 1, 2 or 3 phases against N, with phase failure detection, switching thresholds: 0.7/0.9 x Uc, not adjustable


for general undervoltage monitoring of 1, 2 or 3 phases against N, with phase failure detection, switching thresholds: 0.9 ... 0.95 x Uc, 5 % hysteresis, adjustable


for general undervoltage monitoring of 3 phases against N, with asym-metry, reverse voltage and phase failure detection, with N-conductor monitoring, switching thresholds: 0.7/0.9 x Uc, not adjustable


for undervoltage monitoring of safety light devices of 3-phases against N, with asymmetry, reverse voltage and phase failure detection,with N-conductor monitoring,switching thresholds: 0.85/0.95 x Uc, not adjustable

Contacts, 2 CO contacts 230 4 230/400 2 5TT3 405 0.110 1

for undervoltage monitoring of medical premises of 3 phases against N, with asymmetry, reverse voltage and phase failure detection, with N-conductor monitoring, switching thresholds: 0.9 ... 0.95 x Uc, 5 % hysteresis, adjustable


for monitoring of short-time failure detection ≥ 20 ms of 1, 2 or 3 phases against N, with phase failure detection and N-conductor monitoring,switching thresholds: 0.8 ... 0.85 x Uc, not adjustable


for general under and overvoltage monitoring of 3 phases against N, with asymmetry, reverse voltage and phase failure detection, with N-conductor monitoring and adjustable time delay of 0.1 ... 20 s, switching thresholds: undervoltage: 0.7 ... 1.1 x Uc, 4 % hysteresis, adjustableovervoltage: 0.9 ... 1.3 x Uc, 4 % hysteresis, adjustable



Monitoring Devices


11/22 Siemens ET B1 T · 2007


Characteristic curves


PS*/P. unit


N-conductor monitors with transparent cap

with asymmetry detection and N-conductor monitoring


Timing interval of 5TT3 400 – 5TT3 406 undervoltage relays

Timing interval of 5TT3 410 N-conductor monitors

Timing interval of5TT3 407 short-time voltage relays

Timing interval of5TT3 408 under/overvoltage relays

tv: adjustable automatic reclosing delay 0.2 to 20 s t: adjustable OFF delay 0.1 to 20 s

The undervoltage relay switches at a phase asymmetry of approx. 6 to 8 %, regardless of the response values for undervoltage. The above diagram shows the timing interval for undervoltage or asym-metry.

The undervoltage relay switches at a phase asymmetry of approx. 6 to 8 %, regardless of the response values for undervoltage. The above diagram shows the timing interval for undervoltage.

I2_0

7033

b

A

11-1411-12

L1, L2, L3

C

N

I2_07516b

PEN conductorinterruption

I2_07271c

11-1411-12

UN

tv tv

tv tv

"RESET""RESET"T0

11-1411-12

0

A

Response time

Good-signal Good-signal

Good-signal Good-signal

without faultstorage

with faultstorage

Response time

I2_07270b

11-1411-12

on

t

UH

U

off

on

off

on

off

>U

<U

<U

>U

tt

L1, L2, L3

LED

LED

LED

green

red

red

A

hysteresis

hysteresis


Monitoring Devices



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5TT3 410 N-conductor monitors

Schematics

Circuit diagrams

Switching example for 5TT3 195, 5TT3 40 voltage relays1, 2, 3-phase operation against N

L1 L2 L3 N

14 11 24 21

12 22

L1 L2 L3 N

14 11 24 21

12 22

18 36 36 36

L1 L2

L1

14 11

12

14 11 24 21

12 22

L1 L2 L3N

5 4364

45 90

I2_1

1515

5TT3 4005TT3 401

5TT3 4025TT3 403

5TT3 4045TT3 4055TT3 4075TT3 408

5TT3 1945TT3 1955TT3 406

L1 L2 L3 N

14 11 24 21

12 22

36 5 4364

45 90

I2_1

1516

5TT3 1945TT3 195

5TT3 4025TT3 4035TT3 4045TT3 405

5TT3 4065TT3 4075TT3 4085TT3 410

5TT3 4005TT3 401

14 12 24 22

11 21I2_0

7594

a L1 L2 L3 N

NL1

One-phase operation

A

14 12 24 22

11 21

I2_0

7595

a

L1 L2 L3 N

L1 L2

Two-phase operation

14 12 24 22

11 21I2_0

7596

a L1 L2 L3 N

L1 L3L2 N

Three-phase operation

A

Monitoring Devices


11/24 Siemens ET B1 T · 2007

Schematics

Switching example for 5TT3 401, 5TT3 403, 5TT3 405 undervoltage relays

Application of the undervoltage relay is according to DIN VDE 0108, which stipulates switching to a safety power supply after a fault. Buildings are distinguished according to use, such as business premises, exhibition areas or guest houses. These are all covered generically as rooms/buildings where "people meet". There is a fault if the voltage of the general power supply drops for 0.5 seconds > 15 % in relation to the rated voltage (i.e. 195 V at 230 V).In this case, depending on the type of use of the building, the lighting must be switched to a safety power supply after 0.5 to 15 s. A safety power supply may be: battery system, generating set or a quick-starting standby generating set.

Switching example for 5TT3 404, 5TT3 405, 5TT3 406, 5TT3 408 voltage relays

Switching example for 5TT3 407 short-time voltage relay

These voltage relays can only be used for 3-phase operation. They monitor not only under and overvoltages according to their description, but also reverse voltage, asymmetry and N-conductor breaks.

In the case of sensitive technical sequences, it is often not possible to tell whether this interrupt has interfered with the process sequence. The switch disconnects the power supply, which can then be switched back by using the reset pushbutton.

14 12 24 22

11 21

L1' L2' L3' N'

I2_0

7272

b

L1 L2 L3 L4

K2

L1 L2 L3 N

K1

K1 K2

3x AC 230 V

A

Emergencylighting

Standardlighting

Emergencypower supply

Standardpower supply

I2_07273c

L1 L2 L3 N

L1 L2 L3 N

K1

14 12 24 22

11 21

M

PE

Phase failure

Monitoring Devices



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34567891011121314151617

Schematics

Switching example for 5TT3 407 short-time voltage relay

In simple cases, it may be sufficient that a short-time interrupt is reg-istered without the need to disconnect the power supply. In the case of a short-time interrupt, this is counted by the pulse counter. The pulse counter can be reset if required.

Switching example of 5TT3 410 N-conductor monitors

3 × 230 V AC

L1

5TT3 410

L2 L3

N

K1

L1

L2

L3

N

PE

F1

F2

F3

S1 F4 F5 F6

11

14

K1I2_07517a

Test andservice switch

A

Monitoring Devices

5TT6 1 current relays

11/26 Siemens ET B1 T · 2007

Overview

Direct measurement, transformer measurementAll current relays can be connected with direct measurement or through transformers.

N potentialVersions 5TT6 113 to 5TT6 120 can be connected with a separate N potential.

Response timeCurrent relays are not circuit-protective devices for lines. They switch with a delay in the ms range.

Overload capabilityIndependent of the set measuring range and set measured value, current relays can be permanently overloaded up to 15 A and 20 A; for 3 s, even up to 20 A and 30 A.

Application

Current relays provide 1 and 3-phase monitoring of the over/under-current in an AC system. They are used to monitor lighting and motors.

Buildings/object-safe guiding lightsIn the approach corridors of planes, high buildings must be fitted with position lighting. The same planning instructions apply to the monitoring of this type of lighting and runway lighting as the monitor-ing of emergency lighting.

Monitoring of emergency lighting with incandescent lampsThe function of emergency lighting according to DIN VDE 0108 must be checked at regular intervals. The operational current is continu-ously monitored using current relays. It is irrelevant whether this lighting is integrated in the general lighting or is only supplied on demand with emergency current. The current relay is set so that it is switched on at the max. lamp current. If an incandescent lamp fails, a fault is signaled.

Monitoring of motorsIf the warning is sent early enough, the fault can be eliminated before the motor starts to overheat and the circuit-breaker switches the motor off. Current relays reliably safeguard the monitoring of fault-free running motors and, in some cases are more suitable than a voltage relay, which is geared more towards motor protection.

Example: screw conveyorHard objects in screw conveyors, e.g. in sewage treatment plants, often lead to the conveyor system to getting blocked up. Appropriately set, the current relay signals over its contact(s) that a hazardous situation has occurred and threatens to block the motor.

Example: stirrerAs with the conveyor processes, changes to the viscosity can lead to an overload of the motors.

Example: crane motor control systemThe current monitoring of the main motor (hoisting motor) ensures that the electrical holding brake is not released until the main motor is in operation and the load is held.

Example: dust extraction In the interests of work safety and to protect against massive dust development, it is essential to ensure that the dust extraction system is working perfectly before a saw or sanding machine is switched on.

Device overview 5TT6 111 5TT6 112 5TT6 113 5TT6 114 5TT6 115 5TT6 120

Undercurrent -- --

Overcurrent -- --

1-phase --

3-phase -- -- -- -- --

Separate N potential -- --

Measuring ranges:

Link:

0.1 ... 1 A Z1-Z2 -- -- --

0.5 ... 5 A Z1-Z3 -- --

1 ... 10 A Z1-Z4 --

1.5 ... 15 A Z1-Z3-Z4 -- -- --

Can be programmed over links -- -- --

Contacts 1 CO contact -- -- -- --

2 CO contacts -- --

Monitoring Devices



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Function

Planning the monitoring of an incandescent lampCurrent relays have a hysteresis of approx. 4 %. The smallest lamp must not exceed the set measuring range by more than 8 %.Example: 12 lamps à 100 W = 1200 W, which corresponds to a current of approx. 5.2 A. If a lamp fails, the current drops by 0.4 A. This 0.4 A corresponds to 8 % of the set measured value 5.2 A.

Response timeThe response time of the fault signal is produced by the "Adjustable switching delay" (see the technical specifications) and an additional delay, which is determined from the actual current and the set value.

Function chart for 5TT6 1 undercurrent relay signal

5TT6 1 overcurrent relay signal

Function chart for 5TT6 115 under/overcurrent relay signal

Contrary to all other current relays, a fault signal is always output over the contact 11-14 (21-24). The red LEDs indicate whether the signal is for an undercurrent or an overcurrent.

F Pick-up Dropoutms ms

1 10 250

2 70 70

5 120 30

10 180 15

20 220 10

30 240 12

F =Iact

ImeasIact: Actual currentImeas: Set current threshold value to be measuredPick-up: With an overcurrent relay, the contact 11-14 (21-24) to the

fault signal closes when the actual current flowing is higher than the switching threshold. The relay picks up.

Dropout: With an undercurrent relay, the contact 11-12 (21-22) to the fault signal closes when the actual current flowing is lower than the switching threshold. The relay drops out.

I2_07508c

on

t

off

on

offLED

LED

t

14

2

N

N

tv tv

Hyst.

green

red

Fault

I2_07469b

on

t

off

on

off

LED

LED

t

14

2

t

N

N

v

Hyst.

green

red

Fault

I2_07472b

on

t

U

off

on

offLED

LED

t

t

1 4

2

on

offLED

N

N

tvv tv

green

red

red

Fault Fault

Hyst.

Hyst.

Monitoring Devices


11/28 Siemens ET B1 T · 2007


1) Current corresponds to the rated operational power of the continuous-flow heater.

Data according to DIN VDE 0435-303, IEC 60255 5TT6 111 5TT6 112

Rated control current Ic A 1 ... 10


Operating range Uc V 0.9 ... 1.1Overload capability, continuous A 15Overload capability, short-time at 50 °C ambient A 20

temperature max. 3 s


Response values × Ic switching on infinitely variable, 0.1 ... 1switching off non-adjustable 4 % hysteresis

Switching delay tv infinitely adjustable s 0.1 ... 20

Response time non-adjustable ms 1)


Rated insulation voltage Ui between coil/contact kV 2.5

Contacts µ contact (AC-15)NO contacts A 3NC contacts A 1

Electrical isolations creepage and clearances mm 3actuator/contact






Data according to DIN VDE 0435-303, IEC 60255 5TT6 113 5TT6 114 5TT6 115 5TT6 120

Rated control current Ic 4 ranges 1 areaA 0.1 ... 1 0.5 ... 5A 0.5 ... 5A 1 ... 10A 1.5 ... 15


Operating range Uc V 0.9 ... 1.1Overload capability, continuous A 20 15Overload capability independent of at 50 °C ambient A 30measuring range temperature max. 3 s


Response values × Ic switching on infinitely variable, 1 ... 10switching off non-adjustable 4 % hysteresis

Switching delay tv infinitely adjustable s 0.1 ... 20

Response time non-adjustable ms see page 5/27


Rated insulation voltage Ui between coil/contact kV 2.5

Contacts µ contact (AC-15)NO contacts A 5NC contacts A 1

Electrical isolations creepage distances and clearances

mm 3

actuator/contact






Monitoring Devices



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Ue Ie Measuringrange

MW Order No. Weight1 unitapprox.

PS*/P. unit

V AC A A AC kg Unit(s)

5TT6 111

Current relays with transparent cap for 1-phase loads up to 230 V AC, auxiliary voltage and measuring circuit, not isolated

Undervoltage monitoring, 1-phase

1 CO 230 5 1 ... 10 1 5TT6 111 0.065 1

Overvoltage monitoring, 1-phase

1 CO 230 5 1 ... 10 1 5TT6 112 0.065 1

5TT6 113

5TT6 115

Current relays with transparent cap for 1-phase loads up to 230 V AC, auxiliary voltage and measuring circuit, isolated

undervoltage monitoring, 1-phase

2 COs 230 5 4 ranges 2 5TT6 113 0.122 10.1 ... 10.5 ... 51 ... 101.5 ... 15

overvoltage monitoring, 1-phase

2 COs 230 5 4 ranges 2 5TT6 114 0.122 10.1 ... 10.5 ... 51 ... 101.5 ... 15

Over/undervoltage monitoring, 1-phase

2 COs 230 5 4 ranges 2 5TT6 115 0.122 10.1 ... 10.5 ... 51 ... 101.5 ... 15

Current relays, mounting depth 55 mm, for 3-phase loadsfor 3 × 400 V AC, separate signal with N-wire connection

Over/undervoltage monitoring, 3-phase

2 CO contacts each for over-current/undercurrent respec-tively

230 5 0.5 ... 5 4 5TT6 120 0.220 1


Monitoring Devices


11/30 Siemens ET B1 T · 2007


5TT6 11 current relays 5TT6 120 current relays

Schematics

Circuit diagrams

3618

A2A1

1412

11

N

11

12

14

Z3Z2

ki

21

22

24

Z4Z1

L/i L/i

L/k

36

A2A1

11

12

14

Z3Z2

ki

21

22

24

Z4Z1

5 4364

45 90

I2_1

1518

5 4355

45 90

I2_1

1517

A2A1

11

12

14

k1i1

21

22

24

72

A2A1

31

32

34

k3i3

41

42

44

5TT6 1115TT6 112

5TT6 1135TT6 114

5TT6 115 5TT6 120

5TT6 1115TT6 112

5TT6 113 5TT6 114 5TT6 115 5TT6 120

Switching example: 5TT6 111 undercurrent relay Switching example: 5TT6 114 with transformer measurement for overcurrent measurement

L/i N

L1

N

12 14

11L/k

I2_07522bAC 230 V

To the 5TT3 460or 5TT3 461 faultsignaling relay

A

Monitoring Devices



12

34567891011121314151617

Schematics

Switching example: 5TT6 114 with direct measurement up to 15 A for overcurrent measurement

Switching example: 5TT6 120 with direct measurement up to 5 A for under/overcurrent measurement

Monitoring Devices

5TT6 10 priority switches

11/32 Siemens ET B1 T · 2007

Overview

• Control circuit terminals, sealable• Reduction of the connection fee, which depends on the maximum

load to be supplied (BTO, German Federal Regulation on Tariffs § 6 Section 4), when used in systems with continuous-flow heaters and electric storage heaters where the continuous-flow heaters are switched with priority.

Application

In mixed operation of electric hot water and electric storage heaters, the priority switch interrupts the charging procedure of the storage heater if hot water is required during the low-tariff time, thus limiting the connected load.


1) Current corresponds to the rated operational powerof the continuous-flow heater.

2) Continuous rise not permissible.




Data according to EN 60669 (VDE 0632), BTO § 6 Section 4 5TT6 101 5TT6 102 5TT6 103

Rated control current Ic A 401) 541) 6 ... 401)

Rated frequency Hz 50

Response currents A 132) 232) 6

Rated operational power for continuous-flow heatersup to 230 V AC kW 9 12 1.5 ... 9to 3 × 230 V AC kW 27 36 4.5 ... 27

Rated impulse withstand voltage Uimp kV > 2.5


Rated operational current Ie at Ue = 230 V AC A 1


Conductor cross-sections Coil,for conductor cross-sections up to

mm2 10

contact,for conductor cross-sections up to

mm2 2 × 2.5


Resistance to climate according to DIN 50 016 FW 24

Ue Ie Response-current


PS*/P. unit

V AC A A kg Unit(s)

5TT6 101

Priority switches, mounting depth 55 mm

for continuous-flow heaters up to 27 kW

230 40 13 1 5TT6 101 0.100 1

for continuous-flow heaters up to 33 kW

230 54 23 1 5TT6 102 0.100 1

for electronically controlled continuous-flow heaters up to 27 kW

230 40 6 ... 40 1 5TT6 103 0.100 1

5TT6 101, 5TT6 102, 5TT6 103with terminal cover


Monitoring Devices



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Schematics

Circuit diagram

Switching example: 5TT6 10

In mixed operation of electric hot water and electric storage heaters, the priority switch interrupts the charging procedure of the storage heater if hot water is required during the low-tariff time, thus limiting the connected load.

5TT6 1015TT6 1025TT6 103

A22 4 6

A1

A114 12

A2

5TT3 983

111 3 5

k

i

v

L1 L2 L3L1L1L1 L2 L3 N NN

5TT3 080

I2_07042b

5TT6 101or 5TT6 102or 5TT6 103

Continuous-flowwater heater

Electricstorageheater

EVU release

A

230 V 3AC 230 V AC 400 V 3AC

Monitoring Devices

5TT3 47 insulation monitorsfor industrial applications

11/34 Siemens ET B1 T · 2007

Overview

Version for AC voltage:• For AC voltage systems from 0 to 500 V AC and 10 to 1000 Hz• Adjustable alarm value 2 to 100 kΩ• Electrical insulation of measuring circuit, power supply and contact

voltage• Also supports monitoring in current-free systems.Version for direct voltage:• For direct voltage systems from 12 to 280 V DC • Adjustable alarm value 2 to 200 kΩ• Selective insulation-fault detection according to L+ and L-• Electrical insulation of measuring circuit contact voltage.Both versions:• Closed-circuit principle• Adjustable fault storage and hysteresis• LED display for operation and insulation faults• With canceling and test button

Application

We recommend using insulation monitors in all non-grounded systems according to regulations:• VDE 0100 erection of power installations up to 1000 V• VDE 0105 operation of power installations up to 1000 V• VDE 0113 working and processing machines• VDE 0118 underground mining• VDE 0168 open-pit mining, quarries and others

Function

If the insulation resistance of the system falls below the value set at the device, the output relay drops out. If the insulation resistance subsequently improves, the relay picks up again after a hysteresis.Alternatively the response can be stored through wiring. The reset is then implemented by pressing a pushbutton or by briefly discon-necting the device.Actuating the test button "Test" simulates an insulation fault so that the functionality of the device can be tested.


5TT3 470 5TT3 471

Rated control voltage Uc V AC 220 ... 240 --V DC -- 12 ... 280

Operating range for AC supply × Uc 0.8 ... 1.1 --for DC supply -- 0.9 ... 1.25

Frequency range for Uc Hz 45 ... 400 --

Rated power dissipation Pv for AC supply approx. VA 2 --for DC supply approx. W -- 1

Rated impulse withstand voltage Uimp terminals A1 to A2 kV < 4 < 4terminals L to PE kV < 4 < 4terminals A1, A2 to L, PE kV < 4 < 3terminals against contacts kV < 6 < 6

Measuring circuit for AC systems for direct voltage systems

Measurement voltage range Umeas V AC 0 ... 500 --V DC -- 12 ... 280

Operating range × Umeas 0 ... 1.1 0.9 ... 1.1

Frequency range for Umeas Hz 10 ... 1000 --

Alarm values measuring shunt RAL kΩ 5 ... 10 5 ... 200

Setting of alarm value on absolute scale infinitely variable infinitely variable

Alternating current internal resistance internal testing resistor kΩ > 250 --

Direct current internal resistance internal testing resistor kΩ > 250 --L+ and L- to PE kΩ -- 75 each

Measurement voltage internal approx. V DC

15 --

Max. measurement current short-circuit mA < 0.1 0.2 ... 4 depending on the voltage

Direct interference voltage max. permissible V DC 500 --

Response delay at RAL 50 kΩ and 1 µFand ∞ up to 0.9 x Rmeas s < 1.3 0.8and Rmeas from ∞ to 0 Ω s < 0.7 0.4

Switching hysteresis at Rmeas 50 kΩ % 15 10 ... 15

Contact µ contact 2 COs 2 COs

Rated operational voltage Ue V AC 250 250

Rated operational current Is thermal current limit Ith A 4AC-13 at 24 V DC A -- 3AC-13 at 250 V DC A -- 0.2AC-15 A -- 3AC-15 NO contacts A 5 --AC-15 NC contacts A 2 --

Terminals +/- screw (Pozidriv) 2 2

Conductor cross-sections rigid max. mm2 2 × 2.5flexible with sleeve min. mm2 1 x 0.50


Degree of protection according to EN 60529 °C IP20

Resistance to climate according to EN 60068-1 20 / 060 / 04

Monitoring Devices



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34567891011121314151617



Schematics

5TT3 470 for AC and 3-phase systems

Switching example for monitoring a non-grounded system of 3× 0 ... 500 V AC with a frequency of 10 ... 1000 HzThe actuating voltage of terminals A1 – A2 can be taken from the system being monitored. However, in this case it is important to ensure compliance of the voltage range with the technical specifica-tions.With a jumper LT1 – LT2: a fault signal is not stored; the device is automatically released again if the insulation resistance improves.Without a jumper LT1 – LT2: the error message is stored; pressing the pushbutton terminals LT1 – LT2 clears the fault signal.Pressing the pushbutton terminals PT – PE simulates a fault.

5TT3 471 for direct voltage systems

Switching example for monitoring a non-grounded direct voltage system 12 ... 280 V.The actuating voltage for the terminals L+ and L- is also the measurement voltage.With a jumper LT – X1: a fault signal is not stored; the device is automatically released again if the insulation resistance improves. Without a jumper LT – X1: the error message is stored; pressing the pushbutton terminals LT – X1 clears the fault signal.Pressing the pushbutton terminals PT – X1 simulates a fault.

Uc Ue Measur-ing range


PS*/P. unit

V AC V kΩ kg Unit(s)

5TT3 470

Insulation monitors with transparent cap

for monitoring the insulation resistance in non-grounded AC and 3-phase systems from 10 ... 1000 Hz

Contacts, 2 CO contacts 250 0 ... 500 V 5 ... 100 2 5TT3 470 0.160 1

for monitoring the insulation resistance in non-grounded DC systems

Contacts, 2 CO contacts 250 12 ... 280 V 5 ... 200 2 5TT3 471 0.170 1

36

PTPE

L

LT2LT1

11

12

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22

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36

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5TT3 470 5TT3 471

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Monitoring Devices


11/36 Siemens ET B1 T · 2007

More information

Function charts

5TT3 470 for AC and 3-phase systemsWhile direct interference voltages do not damage the devices they often interfere with conditions in the measuring circuit. In a system being monitored, only one insulation monitor should be connected. This must be taken into account if gateways are used. System capacitances against the protective ground do not corrupt the insulation measurement as these are implemented with direct current. However, it may extend the response time in the event of an insulation fault, primarily in the case of the time constant RE times CE. The auxiliary voltage of the insulation monitor can be taken from a separate system or from the one being monitored. In this case the voltage range of the auxiliary power input must be taken into account.LEDs:• Green LED lights up if actuating voltage Uc is applied.• Red LED lights up in the event of an insulation fault.

5TT4 71 for direct voltage systemsThe insulation monitor can be installed in systems with higher leak-age capacitance against PE. In the case of high-resistance alarm values, a transient alarm signal may occur when switching on the system being monitored due to an existing ground leakage capaci-tance.For the following set values for R, these values for the CE capaci-tance are approx.:• R = 200 kΩ: CE > 0.8 µF• R = 50 kΩ: CE > 2.0 µF• R = 20 kΩ: CE > 4.5 µFIn these applications, you should work without an alarm storage. Due to the measuring function with bridge circuit, the insulation monitor does not respond in the event of a simultaneous, exactly symmetric ground fault of L+ and L-. However, exactly symmetric ground faults are highly unlikely in practice.LEDs:• Green LED lights up if actuating voltage Uc is applied• Red LED 1 lights up for insulation fault L+ against PE• Red LED 2 lights up for insulation fault L- against PE

Front views

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5TT3 470, 5TT3 471

I2_11971

PE PT LT1 LT2

L A1 A2

T1

T2

12 22

14 11 24 21

E1

LED green:

LED red:

E1:

T1:

T2:

status display (ON)

insulation fault (AL)

alarm value adjuster (RAL)

Test

Reset

LED red

LED green

5TT3 470

I2_11972

PE PX X1 LT

L+

T1

T2

12 22

14 11 24 21

L–

E1

LED 1 red

LED green

LED 2 red

LED grün:

LED 1 rot:

LED 2 rot:

E1:

T1:

T2:

status display (ON)

insulation fault L– (RE–)

insulation fault L+ (RE+)

alarm value adjuster (RAL)

Test

Reset

5TT3 471

Monitoring Devices

7LQ3 35 insulation monitorsfor medical premises


12

34567891011121314151617

Overview

7LQ3 350 insulation monitors7LQ3 350 insulation monitors are combination monitoring devices for:• Insulation monitoring of an AC IT system• Load current monitoring of an IT system transformer up to 50 A• Monitoring of an IT system transformer for a non-permissible

temperature riseDevice features:• Adjustable response value 50 kΩ to 500 kΩ• Lad and temperature monitoring• Alarm LED• Connection monitoring for system, ground, current transformer and

temperature sensor • TEST pushbutton• RS485 interface• Group alarm relay with floating CO contact• Illuminated plain text display

7LQ3 351 signaling and test combinationsThe 7LQ3 351 signaling and test combination serves the display of status and fault signals of the insulation monitor.

7LQ3 352 power supply unitsThe 7LQ3 352 power supply unit serves the supply of the 7LQ3 351 signaling and test combination with a power supply of 20 V AC and a total power input of maximum 9 VA.

7LQ3 353 measuring current transformers7LQ3 353 measuring current transformers are used for monitoring power supplies on medical premises. They record the load current and convert it into a usable signal for evaluation devices.

Application

7LQ3 350 insulation monitorsThe 7LQ3 350 insulation monitors are used for monitoring the insula-tion resistance of non-grounded systems on medical premises, such as hospitals, doctors' surgeries and outpatient treatment centers. They also simultaneously monitor the load current and the tempera-ture of the IT system transformer. Used together with the 7LQ3 351 signaling and test combination they comply with the demands of the standards DIN VDE 0100, Part 710 (VDE 0100-710):2002-11 and IEC 60364-7-710:2002-11.

7LQ3 351 signaling and test combinationsThe alarm and event messages output by the 7LQ3 350 insulation monitors are displayed by the 7LQ3 351 with different LEDs and acoustic signals.

7LQ3 352 power supply unitsThis supplies a maximum of 3x 7LQ3 351 signaling and test combinations.

7LQ3 353 measuring current transformersThe measuring current transformer converts currents with a transfor-mation ratio of 50/0.05. The measuring current transformer is con-nected to terminals k and l of the 7LQ3 350 line insulation monitor.Measuring range:• Primary rated current min. 0.5 A• Primary rated current max. 50 A

Functions

7LQ3 350 insulation monitors• Insulation monitoring

The device measures the insulation resistance in 1-phase AC IT systems, which may also contain DC components. Adaptation to the system leakage capacitance (max. 5 µF) is automatic.

• Load current measurement In AC systems, a measuring current transformer records the load current.

• Temperature measurement The temperature in the transformer development is recorded over PTC thermistor or NC contacts.

• Evaluation If one of the values is outside the limit values, an alarm (group message) is triggered. The "ALARM" LED lights up, the alarm relay switches and a message appears in the LCD. This alarm is for-warded to the 7LQ3 351 signaling and test combination over the measuring device interface link.

Legend for control elements

LED/pushbutton Meaning

1 Illuminated text display(2 x 16 characters).

2 LED "ALARM" (yellow)

lights up when a response value is exceeded

3 Arrow keys• In display mode no function• In menu mode for navigating within the menu and for changing

parameters

4 "MENU/ENTER"pushbutton• In display mode for switching from display mode to menu mode.• In menu mode for confirming the selected menu units or con-

firming the selected parameters

5 "TEST" pushbutton• In display mode activates the TEST function (self-test) in display

mode.• In menu mode effects a return to display mode from any posi-

tion. If pressed while changing a parameter, the last change is not saved

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Monitoring Devices


11/38 Siemens ET B1 T · 2007

Functions

7LQ3 351 signaling and test combinationsThe following is shown on LEDs:• Ready to run (green)• Insulation fault (yellow)• Overload (yellow)• Overtemperature (yellow)• CPU malfunctions of the 7LQ3 351 and the 7LQ3 350Self-testThe TEST pushbutton can be used to start a self-test of the 7LQ3 351 and the respective insulation monitoring device. If the TEST push-button is pressed for longer than one second, all the respective LEDs light up. If the TEST pushbutton is released, the lamp test is terminated.At the same time, the respective connected 7LQ3 350 insulation monitor receives a command over the measuring device interface link to carry out its own self-test. The alarms are shown after a few seconds by the LEDs of the signaling combination. The internal buzzer also sounds. The signaling combination then switches back to normal mode.The messages of the self-test are only displayed on the signaling and test combination at which the test was triggered.Muting the alarm buzzerPressing the "Mute" pushbutton silences the alarm buzzer.By adjusting the jumper, the buzzer can be reactivated at three different times.Parameter assignmentThe 7LQ3 351 signaling and test combination has one DIP switch and a 4-position jumper for the purpose of parameter assignment.Display and control elements

7LQ3 352 power supply unitsA 230 V AC power supply is connected to terminals A1/A2. A 20 V AC output voltage is available at terminals U2/V2. Input and output terminals are available in pairs so that several7LQ3 352 can be switched in parallel. However, the A1/A2 and U2/V2 are not interchangeable.The secondary circuit of the in-built safety transformer is protected by a PTC thermistor.

1 The "ON" LED (green) lights up when the power supply unit is in operation.

7LQ3 353 measuring current transformersThe 7LQ3 353 measuring current transformer monitors the load current of a phase for the incoming supply of medical premises. The evaluation is implemented over the 7LQ3 350 isolation monitor (for example).

P1 (K) from the power supply unitP2 (L) to the loadS1 (k), S2 (l) measuring current transformer connections

LED/pushbutton Meaning

1 LED "ON" Status display

2 LED Alarm signal: insulation fault

3 LED Alarm signal: overload

4 LED Alarm signal: overtemperature

5 Pushbutton Mute alarm buzzer

6 "TEST" pushbutton Triggers self-test and test for connected isolation monitoring device

@

#A?B #AB

A"B

A$B

Monitoring Devices



12

34567891011121314151617


7LQ3 350

insulation monitors

7LQ3 351

signaling and test combinations

7LQ3 352

power supply units

7LQ3 353

measuring current transformers

Co-ordination of insulation according to IEC 60664-1Rated voltage V AC 250 250 250 750Rated withstand voltage/pollution severity kV 4 4 4 2.5Pollution severity 3 3 3

Voltage rangesRated system voltage Un V 230Rated frequency fn Hz 50 ... 60

Power supply Us V 230 24 230 --Operating range Us V 0.85 ... 1.15 x Us 12 ... 28 0.85 ... 1.1 x Us --Power consumption max. VA 3 2.5 --

Secondary fuse (internal) -- -- PTC thermistor --Output voltage AC, 50 ... 60 Hz V AC -- -- 20 --Output frequency Hz -- -- 50 ... 60 --Max. total rated output VA -- -- 9 --

General DataEMC immunity to interference according to EN 61326 EN 61000-6-2 EN 61000-6-2 --EMC emitted interference according to EN 61326 EN 61000-6-4 EN 61000-6-4 --

Shock resistance according to IEC 60068-2-27 (device in operation)

g/ms 15/11

Bumping according to IEC 60068-2-29 (transport) g/ms 40/6

Vibration strain according to IEC 60068-2-6• Device in operation g/Hz 1/10 ... 150• Transport g/Hz 2/10 ... 150

Ambient temperature• Operation °C -10 ... +55 -5 ... +55 -5 ... +50 0 ... +85• Transport °C -40 ... +70 -25 ... +60 -25 ... +60 -40 ... +85

Climatic category according to IEC 60721-3-3 3K5Operating mode continuous dutyMounting position as required

Connection type terminal blocks FASTON connector 6.3 x 0.8

Tightening torque Nm 0.5 ... 0.6 --lb. in 4.3 ... 5.3 --

Connection capacity• Rigid mm2 0.2 ... 4 --• Flexible mm2 0.2 ... 2.5 --• Flexible with end sleeve mm2 0.25 ... 2.5 --Conductor size (AWG) AWG 24 ... 12 -- 24 ... 12 --

Degree of protection according to EN 60529• Built-in components IP30 IP50 IP30 --• Terminals IP20 IP20 IP20 --Screw-type attachment 2 x M4 -- 2 x M4 --Quick fastening onto DIN-rail according to IEC 60715 -- IEC 60715 --Flammability class UL 94V-0 UL 94V-0 UL 94V-0 --

Weight approx. kg 0.400 0.150 0.360 --Installation screw mounting,

DIN-rail, distribution boards

flush mounting, cable duct, panel

screw mounting, DIN-rail, distribution boards

--

Enclosure type -- flush-mounting enclosure

-- --

Standard -- -- -- IEC60044-1

Measuring circuit insulation monitoringResponse value Rresp kΩ 50 ... 500 --Response deviation % 0 ... +10 --

Response time tresp• At RF = 0.5 x Rresp s 3 --• At Ce = 1 µF s 3 --

Hysteresis % 25 --Measurement voltage Um V ≤12 --Measurement current Im max (at RF = 0 Ω) µA ≤50 --

Internal resistance DC Ri kΩ ≥ 240 --Impedance Zi at 50 Hz kΩ ≥ 200 --

Permissible direct interference voltage Ufg = DC V ≤375 --Permissible system leakage capacitance Ce µF ≤5 --

Measuring circuit load current monitoringResponse value A 5 ... 50 --Hysteresis % 4 --Temperature influence %/°C < 0.15 --

Measuring circuit temperature monitoringResponse value kΩ 4 --Release value kΩ 1.6 --PTC thermistor according to DIN 44081, max. Units 6 in series --

Monitoring Devices


11/40 Siemens ET B1 T · 2007


7LQ3 350

insulation monitors

7LQ3 351

signaling and test combinations

7LQ3 352

power supply units

7LQ3 353

measuring current transformers

Display and control elementsDisplay (illuminated) LCD --Characters• Number of rows x characters 2 x 16 --• Height mm 3.5 --

Display area measured value kΩ 10 ... 5000 --Operating error acc. to IEC 61557-8 --LEDs -- ON, isolation fault,

overload,overtemperature

--

Pushbuttons -- isometer test buzzer muting

--

InterfacesInterface RS 485 RS 485/terminals A/B --Cable length, max. m 1200 1200 --

Recommended cable (shielded, shield single-sided at PE) JY(ST)Y 2 x 0.6 JY(ST)Y 2 x 0.6 --Terminating resistor Ω 120 (0.25 W) 120 (0.5 W) --Device address 2 1, 3 ... 7 --

Switching elementsAlarm relay 1 CO contact --Mode of operation, adjustable quiescent current or

working current--

Factory presetting working current --

Electrical service life switch-ingcycles

12000 --

Contact class IIB (IEC60255-0-20) IIB (IEC 60255-0-20) --

Rated contact voltage• AC V 250 --• DC V 300 --

Making capacity• AC A 5 --• DC A 5 --

Breaking capacity at• 230 V AC, p.f. = 0.4 2 --• 220 V DC, L/R = 0.04 s 0.2 --

Connecting cable to measuring current transformerCable length, max.• Individual wires = 0.75 mm² m -- 1• Individual wires, twisted = 0.75 mm² m -- 10• Shield cable = 0.6 mm² (shield single-sided at PE)

e.g. JY(ST)Y 2 x 0.6m -- 40

Screw-type attachment -- M3Flammability class -- UL 94V-0

Measuring circuitRated transmission ratio kn A -- 50/0.5Rated load Ω -- 65

Primary rated current• Min. A -- 0.5• Max. A -- 50

Rated output VA -- 2Rated frequency Hz -- 50 ... 400Internal resistance Ω -- 23Accuracy class -- 1

Thermal rated uninterrupted current A -- 60Thermal rated short-time current (1 s) A -- 300Dynamic rated current (30 s) A -- 600

Monitoring Devices



12

34567891011121314151617


Dimensional drawings7LQ3 350 insulation monitors with transformer monitoring

7LQ3 351 signaling and test combinations

7LQ3 352 power supply units

Ue MW Order No. Weight1 unitapprox.

PS*/P. unit

V AC kg Unit(s)

Isolation monitor with load and temperature monitoring

Contacts, 2 CO contacts Response value 50 ... 500 kΩ

250 5.5 7LQ3 350 0.523 1

Signaling and test combinations

with flush-mounting box 250 7LQ3 351 0.250 1

Power supply units 250 3 7LQ3 352 0.560 1

Measuring current transformers 50 A/50 mA AC

with snap-in base, mounting bracket, tapping screws 3 x 8, cap screws M3 x 6, connectors

Measuring range 0.5 ... 50 A 250 7LQ3 353 0.100 1

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Monitoring Devices


11/42 Siemens ET B1 T · 2007

Dimensional drawings7LQ3 353 measuring current transformersMounting option 1

A Snap-in baseB Mounting bracketC Tapping screw 3 mm x 8 mmD Cap screw M3 x 6 mmE ConnectorP1 (K) from the power supply unitP2 (L) to the loadS1 (k), S2 (l) measuring current transformer connections

Mounting option 2

Schematics7LQ3 350 insulation monitors with transformer monitoring

A1, A2 Connection of the power supply UsL1, L2 Connection of monitored systemZ1, Z2 Connection of temperature monitoringk, l Connection of load current monitoringE, KE Dual connection to PEA, B Link of measuring device – interface11, 12, 14 Connection of alarm relay K

F Back-up fuse 6 A (power supply Us)CT 7LQ3 353 measuring current transformers for load

current monitoringδ PTC thermistors (or NC contacts) in the transformer wind-

ing. Max. 6 PTC thermistors may be connected in seriesK Alarm relay without error memory for indication of insula-

tion, overcurrent, overtemperature and CPU malfunctions

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Monitoring Devices



12

34567891011121314151617

Schematics7LQ3 351 signaling and test combinations

7LQ3 350 insulation monitor7LQ3 351 signaling and test combination for insulation monitors7LQ3 352 power supply unit for insulation monitorsA1, A2 connection of the power supply UsU2, V2 output voltage

More information

IT systemIn the IT system designation, the first letter describes the grounding conditions of the power source. I stands for isolation of all live parts from the ground or the linking of a point to the ground over an imped-ance.The second letter designates the grounding conditions of the body of the electrical plant. T means that the body is directly grounded, independently of any existing grounding of a point of the power source.

IT system according to DIN VDE 0100-300:1996-01/IEC 364-3: 1933 and DIN VDE 0100 Part 300/IEC 60364-3

The IT system with additional equipotential bonding and insulation monitorThe IT system is powered over an isolating transformer or an inde-pendent power source (e.g. a battery). The special feature here is the fact that no active conductor is directly linked to the ground in this system. This has the advantage that only a small residual current can flow in the event of a insulation fault. This is largely due to the system leakage capacitances. The upstream fuse does not respond so that the power supply, and therefore operation, is maintained, even in the event of a single-pole ground fault.The high reliability of an IT system is ensured by continuous isolation monitoring. The insulation monitor detects isolation faults as they de-velop and signals in good time if a value falls below a limit value, be-fore any further insulation faults can lead to an unexpected shutdown.

Typical configuration of an IT system with additional equipotential bonding and insulation monitoring

@ @ @

F F

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,D,

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F

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I2_12110

PE

L2

L3

L1

Body

IT system

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M

L2

L3

PE

L1

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Insulationmonitor

Additional equipotential bonding

Monitoring Devices


11/44 Siemens ET B1 T · 2007

More information

Electrical safety for man and machine Insulation resistance is of key importance when considering the protection objectives. Without sufficient insulation resistance • the protection cannot be guaranteed in the event of direct and/or

indirect contact• protective measures against overcurrent or residual currents will

continuously lead to shutdowns• short-circuit current and ground-fault current fires may occur and

destroy plants or system components• high costs are incurred due to shutdowns and damage.

What influences the insulation resistance?Electrical influences:• Static overvoltage• Transient overvoltage• Frequency changes• Lightning strikes• Overcurrent• Voltage waveformMechanical influences:• Shocks, surges• Kinks, bending• Vibrations• Penetration of foreign bodiesEnvironmental influences:• Climate• Humidity, temperature• Chemical influences• Pollution, dust, oil• Corrosive exhaust air, vapor• AgingOther influences:• Animals (e.g. biting)• Plants• Incorrect connection

Result of insulation faultsDanger to persons due to• High touch voltage• Risk of injuryHigh costs due to• Absence of personnel due to injury• Shutdowns• Damage to equipmentRisk of fire/explosions due to• Electric arcs• HeatShutdowns due to• Unwanted shutdowns• Defective devices• Maloperation

Information lead in the IT systemEarly information on falling insulation resistance is crucial, particular-ly in highly sensitive areas, such as that of medical engineering. The insulation monitors in IT systems provide the necessary information lead.

Information lead in the IT system

Principle of operation of insulation monitorsThe insulation monitor is connected between the active conductors and ground (PE conductor) and superimposes a measurement volt-age onto the system. This may be a direct voltage or a pulsing volt-age, depending on the system to be monitored. If an insulation fault occurs, the measuring circuit closes, a small measurement current flows. This measurement current is a measure for the insulation resistance and is evaluated by the device electronics.

Measuring accuracyModern systems contain a broad interference spectrum, which can often prevent or corrupt the measurement of the insulation resis-tance. However, due to the use of cutting edge measurement tech-niques and carefully selected components, Siemens monitoring devices are able to blank out such interferences and produce accu-rate measurements of the insulation resistance. A key feature is our patented AMP measuring method, which is used in all IT systems, particularly in IT systems with converters.

I2_12112

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tTime

Critical value

Information lead

Response value of insulation monitor

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Monitoring Devices

5TT3 472 p.f. monitors


12

34567891011121314151617

Overview

• For AC and 3-phase loads, such as motors• Adjustable p.f. response value, from 0 to 0.97• Current range up to 8 A• For motors up to approx. 5 A, phase-sequence independent• Suitable for transformer connection• LED display for operation and alarm• Automatic resetting of alarm

Application

Monitoring of asynchronous motors for underload and no-load oper-ation, e.g. for fan monitoring in the case of V-belt breakage, for monitoring filters in the event of filter blockages, for pump monitoring in the event of valve closure or dry runs, or for general power factor monitoring.

Function

The p.f. monitors monitor the phase displacement between current and voltage. Because the phase displacement angle changes with the load of the motor, this measurement method is ideal for the monitoring of asynchronous motors for underloading and no-load operation, independent of size. However, in some cases, the p.f. barely changes if the load of the motor changes, e.g. in the case of relatively minor load changes on large-scale motors or 1-phase split-pole motors or collector motors.If the p.f. value set at the p.f. monitor is fallen below for the duration of the set response delay, the output relay switches to the alarm state and the red LED lights up. If it exceeds the p.f. value, the output relay switches back without any significant delay.



5TT3 472

Rated control voltage Uc 3 V AC 400

Operating range for AC supply × Uc 0.8 ... 1.1

Frequency ranges Hz 45 ... 65

Rated power dissipation Pv approx. VA

11

Rated impulse withstand voltage Uimp against contacts kV < 4

Current measuring circuits for AC systems

Current measuring range Imeas A AC 0.4 ... 8

Short-time overload capability for 2 s A 20for 0.5 s A 40

Current transformer, Class 3 or better secondary current A 1 or 5

Setting ranges adjustable p.f. 0 ... 0.97

Response delay adjustable s 1 ... 100

Contacts µ contact 1 CO


Rated operational current Ie thermal current A 415 AC NO contacts A 315 AC NC contacts A 113 AC at 24 V DC A 1

Short-circuit strength fuse 4 A gL A 4





Degree of protection according to IEC/EN 60529 IP20

Resistance to climate according to EN 60068-1 20/060/04

Ie Uc Measuringrange


PS*/P. unit

A V AC A AC kg Unit(s)

p.f. monitors with transparent cap

for monitoring of the underload of motors up to approx. 5 A AC by making p.f. measurements, setting range p.f. from 0 to 0.97

Contact, 1 CO contact 4 3 × 400 0.4 ... 8 1 5TT3 472 0.065 1


Monitoring Devices

5TT3 472 p.f. monitors

11/46 Siemens ET B1 T · 2007


Schematics

More information

Function charts

If the p.f. value set at the p.f. monitor has fallen below for the duration of the set response delay, the output relay switches to the alarm state and the red LED lights up. Contact 11-14 closes and the red LED lights up.

Front view

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B

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B

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Connection of 3-phase load Connection of 1-phase load

Connection of 3-phase load with exter-nal current transformer. Whereby the winding sense of the current transformer must be taken into account.

Connection of motors with separate windings

E

F..G

F.G

/

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L3 L2

11

L1 L1'

14

E1

E2

I2_11973

12

LED 1 green:

LED 2 gelb:

E1:

E2:

status display (U)

underloading indicator (cos alarm)

response value

response delay

LED green

LED yellow

y

Monitoring Devices

5TT3 435 level relays


12

34567891011121314151617

Overview

• 3 electrode connections for 1-step and 2-step level control• All standard products can be used as electrodes• High immunity to interference of the measuring circuit isolated from

the system• Max. cable length to the electrodes: 1500 m• Large setting range: 2 to 450 kΩ,

which enables differentiation between foam and liquid• Programmable for open-circuit principle (with bridge X2 COM) or

closed-circuit principle (without jumper)• Separately adjustable delay times for tv min and tv max, 0.2 to 2 s.

Application

Level monitoring and control of conductive liquids and powders, e.g. maximum and minimum levels, overflow and dry run protection. Monitoring and control of mixture ratio of conductive liquids. General resistance monitoring tasks, e.g. temperature limit detection with PTC.LED displays:• Green LED: lights up if operational voltage is applied• Yellow LED: lights up if MIN output relay is activated• Red LED: lights up if MAX output relay is activated.






Setting range of the liquid level kΩ 2 ... 450

Switching point hysteresis of set value at 450 kΩ % 3at 2 kΩ % 6

Voltage temperature influence from set value % < 2

Max. cable length to the set value kΩelectrodes at 100 µF/km 450 m 50

100 m 20035 m 50010 m 1500

5 m 3000

Electrode voltage, max. AC V approx. 10

Electrode current, max. AC mA approx. 1.5

Response delay adjustable s 0.2 ... 20

OFF-delay adjustable s 0.2 ... 20

Rated operational voltage Ue V 250


Test voltage input/auxiliary circuit kV 4input/output circuit kV 4auxiliary/output circuit kV 4





Monitoring Devices


11/48 Siemens ET B1 T · 2007



5TT3 43 level relays 5TG8 223 immersion electrodes


PS*/P. unit


Level relays with transparent cap

230 4 230 2 5TT3 435 0.162 1

Immersion electrodes

• Made of stainless steel, with PG13 sealing cap• Temperature range 0 ... 60 °C• Suitable for pure water in open containers

with terminal connection 5TG8 223 0.100 1/24

COM 2

1

X

4

MAX

2

A1 A2MIN

12 22

11 24 1

36

COM 2

1

X

4

MAX

2

A1 A2MIN

12 22

11 24 1

36

2X1

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45 90

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5TT3 430 5TT3 435

7914

013

5

Ø16

21

5I2

_124

35

5TG8 223


Monitoring Devices



12

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Schematics

Circuit diagram

Switching example: 5TT3 4351-step level control

2-step level control

The one-step level control is particularly suitable for dry run or overrun protection with free inflow/outflow.The COM reference electrode and the MAX electrode are required.Without the jumper X1-COM only relay 21-22-24 switches.With the jumper X1-COM both relays switch together.

21-2421-22

21-2421-22

COM X2

COM X2

MAX

0

11-14/21-2411-12/21-22

11-14/21-2411-12/21-22

COM X2

COM X2

X1

X1

X1

X1

COM X2

COM X2

I2_07520b

Level

Supply

Static current

Load current

AL1 N

A1 A2

1411

12

2421

22

COM MIN MAX X2

MIN

MAX

X1

I2_07518a

AC 230 V

Level

A

t = tv max adjustable from 0.2 s to 20 s

L1 N

A1 A2

1411

12

2421

22

COM MIN MAX X2

MIN

MAX

X1

I2_07519a

AC 230 V

Level

A

21-2421-22

11-1411-12

COM X2

MAX

0

MIN

H

1

2

X1

21-2421-22

11-1411-12

COM X2

min

X1

11-14, 21-2411-12, 21-22

max

COM X2X1

11-14, 21-2411-12, 21-22COM X2X1

COM X2

COM X2

v

v

min v

max v

Level

Static current

Load current

The 2-step level control keeps the liquid level between a minimum and a maximum level. Three electrodes are required: MIN, MAX and COM.Without the jumper X1-COM, switching is as follows:• If the max. level has fallen be-

low/exceeded, only relay 21-22-24 switches.

• If the min. level has fallen be-low/exceeded, only relay 11-12-14 switches.

With the jumper X1-COM, both relays switch together if the max. level is exceeded or the min. level has fallen below.

tv max and tv min adjustable from 0.2 s to 20 s

Monitoring Devices

5TT3 43 thermistor motor protection relays

11/50 Siemens ET B1 T · 2007

Overview

• For the detection of- temperature limits being exceeded- wire breaks in sensor circuits

• 1 input for 1 to 6 thermistors• With 2 LEDs green/yellow for ready-to-run and fault• Response value: 3.2 to 3.8 kΩ• Release value: 1.5 to 1.8 kΩ• Max. cable length of sensor supply cable NYM 2 × 1.5 is 100 m• Remote reset: over A1/A2 (NC contact) or over X1/X2 (NO contact)

Application

For the prevention of thermal motor overloads, e.g. due to high switching frequency, single-phasing, disabled cooling or excessive ambient temperatures.LED displays:• Green LED: lights up if operational voltage is applied• Red LED: lights up in the event of overtemperature or an

interruption in the sensor circuit



Data according to DIN VDE 0435-110, IEC 60255 5TT3 4315TT3 432




Response value kΩ 3.2 ... 3.8

Release value kΩ 1.5 ... 1.8






Electrical isolations creepage and clearancesactuator/contact mm 4

Rated impulse withstand voltage Uimp actuator/contact kV > 2.5






PS*/P. unit


5TT3 431

Thermistor motor protection relays with transparent cap

230 5 230 2 5TT3 431 0.160 1

with fault storage, reset pushbutton and remote reset

230 5 230 2 5TT3 432 0.160 1


Monitoring Devices



12

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Schematics

Circuit diagrams

Switching examples: 5TT3 431, 5TT3 432

If one of the thermistors (possible for up to 6) reaches the response temperature, the device switches.5TT3 431 (without terminals X1/X2 and without RESET pushbutton) switches back on after cooling and after the value falls below that permanently set for the hysteresis. To switch on before this time, briefly disconnect the power supply.5TT3 432 stores the fault and remains switched off until the RESET pushbutton is pressed.

A1 1

1

P

4 2

X1 X2

12 22

11 24 1

2P

A2

A1 1

1

P

4 2

12 22

11 24 1

2P

A2

36 36 5 4364

45 90

I2_1

1530

5TT3 431 5TT3 432

5TT3 431 5TT3 432

H

R

I2_07280c

TEST/RESET

TEST/RESET

TEST/RESET-

11-14

3,2 k

1,8 k

P1/P2

5TT3 432: 11-12

11-145TT3 431: 11-12

(X1/X2)

U

t

tkey

Overtemperature/sensor breakage

Voltagefailure RESET

A

Monitoring Devices

5TT7 1 GSM alarm modules

11/52 Siemens ET B1 T · 2007

Benefits• Mobile monitoring and control of electrical plants and system

components• Fast and reliable alarm message by SMS• Simple operation and parameterization by means of SMS• Saves space and can be retrofitted in any plant• 1 administrator telephone number from any mobile network for

configuration• Transmission of alarm messages to up to 5 cell phones• Customized tests for 2 alarm inputs and switchable output.

ApplicationThe GSM alarm module (GSM = Global System for Mobile Commu-nications) enables cost-effective remote control of industrial and private building management, e.g. of heating, air-conditioning and cooling systems. But it is also possible to safely control elevators and escalators and all kinds of production equipment, such as machines, automatic devices and conveyor belts. The GSM alarm module is particularly suitable for distant plants, such as monitoring the heating of summer houses or the pumps of a water treatment plant.By using voltage relays, current relays, fuse monitors, miniature circuit-breakers, residual current operated circuit-breakers or surge suppressors fitted with auxiliary switches or signal contacts there are virtually no limits to the type of monitoring tasks that can be carried out. The use of remote control mechanisms with miniature circuit-breakers and residual current operated circuit-breakers also allows realization of a range of cost-effective solutions.Note:Because the availability of mobile networks cannot be guaranteed, GSM alarm modules should not be used for safety-relevant control functions.

Function

SIM cardAn activated SIM card of a GSM network provider is used (e.g. T-Mobile D1, Vodafone D2, E-Plus, O2 – even prepaid cards). The card is prepared for use in the GSM alarm module in a conventional cell phone, by setting the PIN to "1234". The device can then be sim-ply configured and put into service without any software tools or pro-gramming skills. The status of two digital inputs are monitored and in the event of any change, an SMS is sent. By sending an SMS from a cell phone to the GSM alarm module you can switch the output.

AdministratorOne cell telephone number has administrator rights. This administra-tor number is used to specify the signaling and control texts, define time responses at output and inputs and register and store up to 5 further phone numbers in the device. An SMS alarm message is then also sent to these 5 phone numbers in the event of a fault.

Freecall functionThe freecall function is an extremely interesting feature and – unlike the sending of SMS messages – completely free. It can be used for the functions of the GSM alarm module. By simply selecting the device, this function can be used to switch the output, switch it over or call up the switching states of inputs and outputs. The GSM alarm module detects the phone number that is calling, checks the autho-rization and executes the desired function. To use this function, the anonymous call feature must be disabled on the phone being used.

Safety in the event of power failureIn contrast to the 5TT7 110-0 GSM alarm module, the 5TT7 120-0 version is also fitted with a backup battery. Any device power faillure is detected by the 5TT7 120-0 GSM alarm module. The device then sends an appropriate alarm SMS and switches itself off.

Status interrogationA status SMS can be used to query the switching state of both inputs and the output. If required, the freecall function can also be used for this purpose.

Heartbeat functionThe GSM alarm module automatically sends a status SMS at user-definable intervals.

User-definable device nameIn the devices, users can define their own device names. This device name then prefixes each SMS. If more than one device is in use, the user can clearly see where the alarm has occurred.

Power-On SMSIf required, the GSM alarm module automatically sends a so-called Power-On SMS with device name and time delay after the system is switched on. A time delay can be set for the inputs. If there is a change in the device state, the alarm SMS is then not sent until the set delay time has expired.

Time delayThe adjustable delay time serves to suppress the sending of multiple Alarm messages, e.g. in the case of chattering contacts. This time is started after an alarm SMS is sent. No further SMS is then sent within the set time interval.

Monoflop functionThis allows a time to be set after which the output is automatically reset to zero.

Password protectionIf the password protection is activated, the password must be entered in front of each SMS. This protects against unauthorized access

Interrogation settingsAll the settings of a device can be called up using a range of of SMS interrogations.

Monitoring Devices



12

34567891011121314151617


1) Continuous operation possible with restricted function: The device is able to log into the system and there is a > 90 % likelihood it will execute calls with a signal strength of -85 dBm. The sender output capacity and the receiver sensitivity may be reduced.


5TT71 110-0 5TT71 120-0

Rated operational voltage Ue V DC 10 ... 30

• Permissible residual ripple

- at 10 V % < 1

- at 30 V % < 10

Rated power Ps W 3.5 4.5

Digital inputs V DC 24; 2-wire connection, isolated

Signal voltage "0" at the input V DC -2 ... 2

Signal voltage "1" at the input V DC 8 ... 30

Maximum contact load at p.f. = 1 V;A 250; 5

Maximum contact load V;A 30; 5

Vibration resistance according to EN 60068-2-34 g 1 at 10 ... 500 Hz

Shock resistance according to EN 60068-2-27 g 30 for 18 ms

Shock resistance according to EN 60068-2-29 g 25 for 6 ms

EMC according to EN 6100-6-2, EN 61000-6-3 complied with

Ambient temperature °C -20 ... +55 -20 ... +50

• Expanded1) °C -30 ... +75 ---

Storage temperature °C -40 ... +85 -20 ... +50

Frequency band E-GSM 900 / GSM 1800

Power class GSM 900:4 (2 W) / GSM 1800:1 (1 W)

GPRS class multislot class 8, operation mode class B, HSCSD, SAT

Terminals ± screw (Pozidriv) 1

Conductor cross-sections rigid max. mm2 1.5 ... 4

1 ... 2.5flexible with sleeve min. mm2

Humidity at 40 °C % 0 ... 95


PS*/P. unit

V AC A AC V DC kg Unit(s)

GSM alarm modules

for GSM network operatin with two alarm inputs and one switching output

230 5 24 4 5TT7 110-0 0.205 1

• With backup battery for signaling in the event of power failures

230 5 24 4 5TT7 120-0 0.250 1

Aerials

Rod aerial with magnet base, MMC connection and connecting cable

5TT7 908-1 0.070 1

Flat form for adhesion, with MMC connection and connecting cable

5TT7 908-2 0.050 1


Monitoring Devices


11/54 Siemens ET B1 T · 2007

Dimensional drawings5TT7 110-0 5TT7 120-0

Schematics

Circuit diagram5TT7 110-0 5TT7 120-0

4560772

90

I2_1

2854

34

DI1

56

DI2

78

D0

+24V12

I2_1

2852

Monitoring Devices



12

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Switching example

Switching a 5TT3 051 remote control• The GSM alarm module sends an ON command. • The switching relay switches and sends this command to the

remote control, whereby the voltage at the remote control switches the relay from the OFF to the ON input over the changeover contact.

• The auxiliary switch relays the ON position of the remote control to the input of the GSM alarm module. This sends the switching posi-tion ON per SMS.

N

L1

24 V DC – +

4

DI1

56

DI2

78

D0

+24 V 12

A1A213212214

M

3 2 OFF ON

1 N P N 5 3 1

N 6 4 2

13 21 22 14

3

I2_1

3381

5ST3 051 Remote controlled mechanism

5SM3 346-6 RCCB

5ST3 010 Auxiliary switch

Power supply

5TT4 205-0 Switching relay

5TT7 110-0 5TT7 120-0 GSM alarm module

230 V AC

Monitoring Devices

Notes

11/56 Siemens ET B1 T · 2007

Business

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