A A

MicrologicControl units2.0, 5.0 and 6.0

Low voltage electrical distribution

User manual04/2010

MicrologicControl units 2.0, 5.0 and 6.0

�04443722AA - 04/20�0

Contents

Discovering your control unit 2Identifying your control unit 2Overview of functions 4

Setting your control unit 8Setting procedure 8Setting the Micrologic 2.0 control unit 9Setting the Micrologic 5.0 control unit �0Setting the Micrologic 6.0 control unit ��

Fault and status indications 12Resetting the fault indications and checking battery status on Micrologic 6.0 �2Testing the control unit �3

Technical appendix 14Tripping curves �4Changing the long-time rating plug �6Thermal memory �7

2 04443722AA - 04/20�0

Discovering your control unit

DB

�289

53

All Compact NS800-3200 and Masterpact NT and NW circuit breakers are equipped with a Micrologic control unit that can be changed on site.Control units are designed to protect power circuits and connected loads.

Identifying your control unitDesignations

X: type of protection 2 for basic protection5 for selective protection6 for selective + earth-fault protection 7 for selective + earth-leakage protection.

Y: version number Identification of the control-unit generation."0" signifies the first generation.

Z: type of measurementA for "ammeter"P for "power meter"H for "harmonic meter"no indication = no measurements.

bbbb

bbbb

Micrologic 2.0

YX

Z

Micrologic 2.0: basic protection

E5�

266B Micrologic 2.0

.4.5.6

.7.8

.9.95.98

1

x Ir

22.5

3 4 56

8101.5

setting

Isd

.512

48

121620

instantaneous

long timealarmIr tr

(s)

x In at 6 Ir24

DB

1193

96

0 Ir Isd I

t

Long time + Instantaneous

Micrologic 5.0: selective protection

E51

353A

Micrologic 5.0

setting delay

short timeI itsd

(s)

long timealarm

x In

34

68

101215

off2

.4.5.6

.7.8

.9.95.98

1

Ir

x In

x Ir

22.5

34 5

68

10

Isd

1.5

.512

48

121620

tr(s)

at 6 Ir24

on I2t

.2

.3.4 .4

.1

.2.3

.10

instantaneous

DB

1193

97

0 Ir I

t

IiIsd

Long time + Short time + Instantaneous

Micrologic 6.0: selective + ground-fault protection

DB

�289

22 Micrologic 6.0

delay

short time

on I2t

.2

.3.4 .4

.1

.2

.10

long timealarm

ground fault

setting

4

test

.4.5.6

.7.8

.9.95.98

1

Ir

x In .512

48

121620

tr(s)

at 6 Ir24

x Ir

22.5

3 4 568

10

Isd

1.5

tsd(s)

x In

3

68 10

1215

off2

BC

D E FGH

I

Ig

Aon I

2t

.2

.3.4 .4

.1

.2.3

.10off

tg(s)

.1

.3instantaneous

I i

DB

�289

23

0 Ir I

t

IiIsd

DB

�289

24

0 I

t

I2t off

I2t on

Ig

Long time + Short time + Instantaneous

Ground-fault protection

304443722AA - 04/20�0

1 Top fastener2 Bottom fastener3 Protective cover4 Cover opening point5 Lead-seal fixture for protective cover6 Long-time rating plug7 Screw for long-time rating plug8 Connection with circuit breaker9 Housing for battery10 Terminal block for external connections

Adjustment dials

11 Long-time current setting Ir12 Long-time tripping delay tr13 Short-time pickup Isd14 Short-time tripping delay tsd15 Instantaneous pick-up Ii16 Ground-fault pick-up Ig17 Ground-fault tripping delay tg

Indications

18 LED indicating an overload19 LED indicating long-time tripping20 LED indicating short-time tripping21 LED indicating ground-fault tripping22 LED indicating auto-protection tripping

Test

23 Button for fault-trip reset and battery test24 Test button for ground-fault protection25 Test connector

Identifying your control unitPresentation

E51

355B

E51

356A

Micrologic 2.0

.4.5.6

.7.8 .9

.95

.98

1.5

12

48 12

16

20

24

long time

alarm

Ir

tr(s)

x In@ 6 Ir

1

5

3

7

6

4

28


DB

�289

25

.4.5.6

.7.8 .9

.95

.98

1.5

12

48 12

16

20

24

long time

alarm

Ir

tr(s)

x In@ 6 Ir

7

6

3

2

1

10

5

9

Micrologic 6.0

4

DB

�289

52

Micrologic 2.0

.98

instantaneous

long timealarm

.512

48

121620

tr(s)

at 6 Ir24.4

.5

.6.7

.8.9

.95

1

Ir

x In

x Ir

22.5

3 4 568

101.5

setting

Isd

11

12

13

7

18

5

25

DB

�289

26

.4.5.6

.7.8

.9.95.98

1

delay

short timeI itsd

(s)

on I2t

.2

.3.4 .4

.1

.2.3

.10off

long timealarmIr

x In

ground fault

BC

DE F

GH

I

Ig tg(s)

on I2t

.2

.3.4 .4

.1

.2.3

.10off

A

.512

48

121620

tr(s)

at 6 Ir24

settingx Ir

22.5

34 5

68

10

Isd

1.5x In

34

68 10

1215

off

test

instantaneous

2

Micrologic 6.0

12

11

14

13

17

16

18

23

7

15

25

22212019

24

5

DB

�289

54 Micrologic 5.0

setting delay

short time

long timealarm

4

.4.5.6

.7.8

.9.95.98

1

Ir

x In .512

48

121620

tr(s)

at 6 Ir24

I i

x In

3

68 10

1215

off2

tsd(s)

on I2t

.2

.3.4 .4

.1

.2.3

.10offx Ir

2

2.53

4 568

10

Isd

1.5

11

12

7

18

5

25

13

14

15

instantaneous

4 04443722AA - 04/20�0


Overview of functionsCurrent protection

Protection settingsDepending on the type of installation, it is possible to set the tripping curve of your control unit using the parameters presented below.

Micrologic 2.0 Micrologic 5.0 and 6.0 Micrologic 6.0

DB

1193

98

0 Ir Isd I

t1

2

3

DB

1193

99

1

2

34

5

0 Ir Isd I

t

Ii

I2t off

I2t on DB

�289

27

0 I

t

I2t off

I2t on

Ig

1

2

�. Current setting Ir (long time)2. Tripping delay tr (long time) for 6 x Ir3. Pick-up Isd (instantaneous)

�. Current setting Ir (long time)2. Tripping delay tr (long time) for 6 x Ir3. Pick-up Isd (short time)4. Tripping delay tsd (short time)5. Pick-up Ii (instantaneous)

�. Pick-up Ig (ground fault)2. Delay tg (ground fault)

Long-time protectionThe long-time protection function protects cables (phases and neutral) against overloads. This function is based on true rms measurements.

Thermal memoryThe thermal memory continuously accounts for the amount of heat in the cables, both before and after tripping, whatever the value of the current (presence of an overload or not). The thermal memory optimises the long-time protection function of the circuit breaker by taking into account the temperature rise in the cables.The thermal memory assumes a cable cooling time of approximately 15 minutes.

Long-time current setting Ir and standard tripping delay tr

Micrologic control unit Accuracy 2.0, 5.0 and 6.0Current setting Ir = In (*) x … 0.4 0.5 0.6 0.7 0.8 0.9 0.95 0.98 1Tripping betweeen �.05 and �.20 Ir Other ranges or disable by changing rating plug

Time setting 0.5 1 2 4 8 12 16 20 24Time delay (s) tr at 1.5 x Ir

tr at 6 x Irtr at 7.2 x Ir

0 to - 30%0 to - 20%0 to - 20

�2.50.7 (1)

0.7 (2)

25�0.69

502�.38

�0042.7

20085.5

300�28.3

400�6��

50020�3.8

60024�6.6

(*) In: circuit breaker rating(1) 0 to - 40%(2) 0 to - 60%

Setting accuracy of the Ir setting may be enhanced by using a different long-time rating plug.See the technical appendix "Changing the long-time rating plug".

Overload LED

E51

360A

x Ir

2

2.53 4 5

6

8101.5

setting

Isdinstantaneous

long timealarmtr

(s)

.4.5.6

.7.8

.9.95.98

1

Ir

x In .512

48

121620

at 6 Ir24

E51

361A

.4.5.6

.7.8

.9.95.98

1

delay

short timeI itsd

(s)

on I2t

.2

.3.4 .4

.1

.2.3

.10

off

long timealarmIr

x In .512

48

121620

tr(s)

at 6 Ir24

settingx Ir

2

2.53 4 5

68

10

Isd

1.5x In

34

6 8 101215

off2

instantaneous

DB

�289

28

.4.5.6

.7.8

.9.95.98

1

delay

short timeI itsd

(s)

on I2t

.2

.3.4 .4

.1

.2.3

.10off

long timealarmIr

x In

ground fault

BC

DE F

GH

I

Ig tg(s)

on I2t

.2

.3.4 .4

.1

.2.3

.10off

A

.512

48

121620

tr(s)

at 6 Ir24

settingx Ir

22.5

34 5

68

10

Isd

1.5x In

34

68 10

1215

off

test

instantaneous

2

This LED signals that the long-time current setting Ir has been overrun.

504443722AA - 04/20�0

Short-time protectionThe short-time protection function protects the distribution system against

impedant short-circuits.The short-time tripping delay can be used to ensure discrimination with

a downstream circuit breaker.This function carries out true rms measurements.

The I2t ON and I2t OFF options enhance discrimination with downstream protection devices.

Use of I2t curves with short-time protection:I2t OFF selected: the protection function implements a constant time curveI2t ON selected: the protection function implements an I2t inverse-time curve up to

�0 Ir. Above �0 Ir, the time curve is constant. Short-time pick-up Isd and tripping delay tsd

Micrologic control unit 2.0, 5.0 and 6.0Pick-up Isd = Ir x … accuracy ±10 % �.5 2 2.5 3 4 5 6 8 �0Time delay (ms)at �0 Ir

setting I2t OffI2t On

0 0.�0.�

0.20.2

0.30.3

0.40.4

I2t On orI2t Off

tsd (max resettable time)tsd (max break time)

2080

80�40

�40200

230320

350500

Instantaneous protectionThe instantaneous-protection function protects the distribution system

against solid short-circuits. Contrary to the short-time protection function, the tripping delay for instantaneous protection is not adjustable. The tripping order is sent to the circuit breaker as soon as current exceeds the set value, with a fixed time delay of 20 milliseconds.

This function carries out true rms measurements.

Instantaneous pick-up Isd

Micrologic control unit 2.0Pick-up Isd = Ir x … accuracy ±10 % �.5 2 2.5 3 4 5 6 8 �0Time delay (ms) tsd (max resettable time)

tsd (max break time)2080

Instantaneous pick-up Ii

Micrologic control unit 5.0 and 6.0Pick-up Ii = In (*) x … accuracy ±10 % 2 3 4 6 8 �0 �2 �5 OFFTime delay (ms) tsd (max resettable time)

tsd (max break time)2050

(*) In: circuit-breaker rating.

b

b

b

b

bvv

b

b



6 04443722AA - 04/20�0



Neutral protection on four-pole circuit breakersProtection of the neutral conductor depends on the distribution system. There are three possibilities:

Type of neutral DescriptionNeutral unprotected The distribution system does not require protection

of the neutral conductor.Neutral protection at 0.5 In

The cross-sectional area of the neutral conductor is half that of the phase conductors.

The long-time current setting Ir for the neutral is equal to half the setting value

The short-time pick-up Isd for the neutral is equal to half the setting value

The instantaneous pick-up Isd (Micrologic 2.0) for the neutral is equal to half the setting value

The instantaneous pick-up Ii (Micrologic 5.0 and 6.0) for the neutral is equal to the setting value

b

b

b

b

Neutral protection at In The cross-sectional area of the neutral conductor is equal to that of the phase conductors.

The long-time current setting Ir for the neutral is equal to the setting value

The short-time pick-up Isd for the neutral is equal to the setting value

The instantaneous pick-ups Isd and Ii for the neutral are equal to the setting value

b

b

b

Neutral protection on three-pole devicesNeutral protection is not available on three-pole devices.

Ground-fault protection on Micrologic 6.0 A ground fault in the protection conductors can provoke local temperature rise at

the site of the fault or in the conductors.Ground-fault and neutral protection are independent and can therefore be

combined. The purpose of the ground-fault protection function is to eliminate this type of fault.

There are two types of ground-fault protection.

Type DescriptionResidual The function determines the zero-phase sequence current, i.e.

the vectorial sum of the phase and neutral currentsIt detects faults downstream of the circuit breaker.

b

b

Source Ground Return Using a special external sensor, this function directly measures the fault current returning to the transformer via the earth cable

It detects faults both upstream and downstream of the circuit breaker

The maximum distance between the sensor and the circuit breaker is ten metres.

b

b

b

Ground-fault pick-up Ig and tripping delay tgThe pick-up and tripping-delay values can be set independently and are identical for both the residual and "source ground return" ground-fault protection functions.

Micrologic control unit 6.0Pick-up Ig = In (*) x … accuracy ±10 % A B C D E F G H I

In y 400 A 0.3 0.3 0.4 0.5 0.6 0.7 0.8 0.9 �400 A < In y �200 A 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 �In > �200 A 500 A 640 A 720 A 800 A 880 A 960 A �040 A ��20 A �200 A

Time delay (ms)at �0 In (*)

setting I2t OffI2t On

0 0.�0.�

0.20.2

0.30.3

0.40.4

I2t On orI2t Off

tg (max resettable time)tg (max break time)

2080

80�40

�40200

230320

350500

* In: circuit-breaker rating.

b

b

b

704443722AA - 04/20�0


Overview of functionsMicrologic 6.0 fault indications

The battery maintains the fault indications.If there are no indications, check the battery.

DB

�289

29

Micrologic 6.0 Signals tripping due to an overrun of the long-time current setting Ir.

DB

�289

30

Micrologic 6.0 Signals tripping due to an overrun of the short-time pick-up Isd or the instantaneous pick-up Isd / Ii.

DB

�289

3�

Micrologic 6.0 Signals tripping due to an overrun of the ground-fault pick-up Ig.

DB

�289

32

Micrologic 6.0 Signals tripping due to the auto-protection function of the control unit.The auto-protection function (excessive temperature or short-circuit higher than circuit breaker capacity) opens the circuit breaker and turns on the Ap LED.

Important remarkIf the circuit breaker remains closed and the Ap LED remains on, contact the Schneider after-sales support department.

8 04443722AA - 04/20�0

Setting your control unit Setting procedure

Important remarkWith the 4P 3D setting, the current in the neutral must not exceed the rated current of the circuit breaker.

Selecting the type of neutral protectionOn four-pole circuit breakers, it is possible to select the type of neutral protection using the three-position switch:

E51

383A

4P 3D

3D+N/2

4P 4D

Neutral unprotected (4P 3D)

Neutral protection at 0.5 In (3D + N/2)

Neutral protection at In (4P 4D).

b

b

b

Setting procedureUsing the adjustment dials

DB

1194

00

Micrologic 2.0

1

DB

1194

01

Micrologic 2.0

2D

B�2

0063

Micrologic 2.0

3

Open the protective cover.

Select the desired setting. Close the protective cover and, if necessary, install a lead seal to protect the settings.

904443722AA - 04/20�0

Setting the Micrologic 2.0 control unit

Setting your control unit

The rating of the circuit breaker in this example is 2000 A.

DB

�200

64

In = 2000 A

Micrologic 2.0

In = 2000 A

See pages 4, 5 and 6 for information on the available settings.

Set the threshold values

DB

1194

05

In = 2000 A

Ir = 0.7 x In = 1400 A

Isd = 3 x Ir = 4200 A

alarm

x Ir

22.5

3 4 568

101.5

setting

Isdinstantaneous

.4.5.6

.7 .8 .9.95.98

1

long timeIr

x In

DB

1194

06

0 I

tIr

Isd

Set the tripping delay

DB

1194

04

long timealarm

.512

48

121620

tr(s)

at 6 Ir24

tr = 1 second

DB

1194

07

0 I

t

tr

�0 04443722AA - 04/20�0

Setting your control unit Setting the Micrologic 5.0 control unit




DB

1194

08 In = 2000 AIr = 0.7 x In = 1400 A

Ii = 3 x In = 6000 A

Isd = 2 x Ir = 2800 A.4.5.6

.7 .8 .9.95.98

1

setting

short timeI i

x Ir

22.5

3 4 568

10

Isd

1.5

long timealarmIr

x In

x In

34

6 8 101215

off2

instantaneous

I2t OFF curve I2t ON curve

DB

1194

10

Ir

Isd

Ii

0 I

t

DB

1194

10

Ir

Isd

Ii

0 I

t


DB

1194

09

tr = 1 second

tsd = 0.2 seconds

short time

long timealarm

.512

4 8 121620

tr(s)

at 6 Ir24

delay

tsd(s)

on I2t

.2

.3.4 .4

.1

.2.3

.10

I2t on I2t off

I2t OFF curve I2t ON curve

DB

1194

12

tr

tsd

0 I

t

DB

1194

13

tr

tsd

0 I

t

��04443722AA - 04/20�0

Setting your control unit Setting the Micrologic 6.0 control unit




DB

�289

34

short time

long timealarm

ground fault

setting

.4.5.6

.7.8

.9.95.98

1

Ir

x In

x Ir

22.5

3 4 56

810

Isd

1.5

BC

D E FGH

I

Ig

A

I i

x In

34

6 8 101215

off2

In = 2000 A

Ir = 0.7 x In = 1400 A

Ii = 3 x In = 6000 A

Isd = 2 x Ir = 2800 A

B Ig = 640 A

instantaneous

test

I2t ON curve I2t OFF curve

DB

�289

35 Ir

Isd

Ii

0 I

t

DB

�289

36

Ir

Isd

Ii

0 I

t

DB

�289

37

0 I

t

Ig

DB

�289

38

0 I

t

Ig


DB

�289

43

short time

long timealarm

ground fault

.512

48

121620

tr(s)

at 6 Ir24

delay

tsd(s)

on I2t

.2

.3.4 .4

.2.3

.10

off

tg(s)

on I2t

.2.3

.4 .4

.1

.2.3

.10off

tr = 1 s

tsd = 0.2 s

tg = 0.2 s

I2t on I2t off.1

test

I2t ON curve I2t OFF curve

DB

�289

39

tr

tsd

0 I

t

DB

�289

40

tr

tsd

0 I

t

DB

�289

4�

0 I

t

tg

DB

�289

42

0 I

t

tg

�2 04443722AA - 04/20�0

Fault and status indications Resetting the fault indications and checking battery status on Micrologic 6.0

The procedure for closing the circuit breaker following a fault trip is presented in the circuit-breaker user manual.

Resetting the fault indicationsDetermine why the circuit breaker tripped. The fault indication is maintained until it

is reset on the control unit. Press the fault-trip reset button.

b

b

DB

�289

44 Micrologic 6.0

Check the parameter settings of the control unit.b

Checking the battery

DB

�289

44 Micrologic 6.0

Press the battery-test button (which is the same as the fault-trip reset button) to check the luminance of trip indicator light.

If trip indicators are dim or there is no luminance, then the battery needs to be changed.

b

b

If the battery needs to be changed, order a new battery with the Schneider catalogue number 33593.b Lithium batteryb �.2 AA, 3.6 V, 850 mA/hb SAFT LS3 SONNENSCHEIN TEL-Sb Service life ten years.

Changing the control-unit battery�. Remove the battery cover.

2. Remove the battery.

DB

�289

45

DB

�289

46

3.Insert a new battery.Check the polarity.

4. Put the cover back inplace. Press the battery-test button to check the new battery.

DB

�289

47

DB

�289

48

�304443722AA - 04/20�0

Testing the control unitFault and status indications

See the user manual for the portable test kit. Testing the control unitTo test the control unit, connect the portable test kit via the test connector

DB

1194

00

Micrologic 2.0

1

DB

1194

15

Micrologic 2.0

2

Micrologic 2.0

2

Testing the ground-fault protection on Micrologic 6.01. Charge and close the circuit breaker.2. Using a screwdriver, press the test button for ground-fault protection. The circuit breaker should open.

Important remarkIf the circuit breaker does not open, contact the Schneider after-sales support department.

DB

�289

50

Micrologic 6.0

�4 04443722AA - 04/20�0

Technical appendix Tripping curves

Long-time and instantaneous protection - Micrologic 2.0

DB

1194

16

.5 .7 1 2 3 4 5 7 10 20 30 50 70 100 200 300

I / Ir

10 0005 000

2 0001 000

500

200100

50

2010

5

21.5

.2

.1.05

.02

.01.005

.002

.001

t(s)

tr = 0.5…24 s

Isd = 1.5…10 x Ir

Ir = 0.4…1 x In

Long-time, short-time and instantaneous protection - Micrologic 5.0 and 6.0

DB

1194

17

0

0.40.30.20.1

t(s)

.5 .7 1 2 3 4 5 7 10 20 3 5 7 10 20 30

10 0005 000

2 0001 000

500

200100

50

2010

5

21.5

.2

.1.05

.02

.01.005

.002

.001

x In

tr = 0.5…24 s

Isd = 1.5…10 x Ir

Ir = 0.4…1 x In

Ii = 2…15 x In . OFF

I2t OFF

x Ir

0.40.30.20.1

I2t ON

0

�504443722AA - 04/20�0

Technical appendix Tripping curves

Ground-fault protection - Micrologic 6.0

DB

�289

5�

�6 04443722AA - 04/20�0

Changing the long-time rating plug

Technical appendix

Select the long-time rating plugA number of setting ranges for the long-time current setting are available on Micrologic 2.0, 5.0 and 6.0 control units by changing the long-time rating plug.The available rating plugs are listed below:

Part number Setting range for the Ir value33542 standard 0.4 to 1 x Ir33543 low setting 0.4 to 0.8 x Ir33544 high setting 0.8 to 1 x Ir33545 without long-time protection

Ir = In for the short-time protection setting

Important remarkFollowing any modifications to the long-time rating plug, all control-unit protection parameters must be checked.

Change the long-time rating plugProceed in the following manner.

�. Open the circuit breaker.2. Open the protective cover of the control unit.

3. Completely remove the long-time rating plug screw.

DB

1194

18

DB

��94

�9

If no long-time rating plug is installed, the control unit continues to operate under the following downgraded conditions:

the long-time current setting Ir is 0.4, whatever the position of the adjustment dial

the long-time tripping delay tr corresponds to the value indicated by the adjustment dial.

b

b

4. Snap out the rating plug. 5. Clip in the new rating plug.

DB

1194

20

.4.5.6

.7.8 .9

.95

.981

long time

alarm

Ir

x In.5

12

48 12

1620

tr(s)

@ 6 Ir24

DB

1194

21

.4.5.6

.7.8 .9

.95

.981

long time

alarm

Ir

x In.5

12

48 12

1620

tr(s)

@ 6 Ir24

6. Refit the screw for the long-time rating plug.

7. Check and/or modify the control-unit settings

�704443722AA - 04/20�0

Thermal memory

Thermal memoryThe thermal memory is a means to simulate temperature rise and cooling caused by changes in the flow of current in the conductors. These changes may be caused by:

repetitive motor starting;loads fluctuating near the protection settings;repeated circuit-breaker closing on a fault.

Control units without a thermal memory (contrary to bimetal strip thermal protection) do not react to the above types of overloads because they do not last long enough to cause tripping. However, each overload produces a temperature rise and the cumulative effect can lead to dangerous overheating.

Control units with a thermal memory record the temperature rise caused by each overload. Even very short overloads produce a temperature rise that is stored in the memory.This information stored in the thermal memory reduces the tripping time.

Micrologic control units and thermal memoryAll Micrologic control units are equipped as standard with a thermal memory.

For all protection functions, prior to tripping, the temperature-rise and cooling time constants are equal and depend on the tripping delay in question:

if the tripping delay is short, the time constant is low;if the tripping delay is long, the time constant is high.

For long-time protection, following tripping, the cooling curve is simulated by the control unit. Closing of the circuit breaker prior to the end of the time constant (approximately 15 minutes) reduces the tripping time indicated in the tripping curves.

Short-time protection and intermittent faultsFor the short-time protection function, intermittent currents that do no provoke tripping are stored in the Micrologic memory.This information is equivalent to the long-time thermal memory and reduces the tripping delay for the short-time protection.Following a trip, the short-time tsd tripping delay is reduced to the value of the minimum setting for 20 seconds.

Ground-fault protection and intermittent faultsThe ground-fault protection implements the same function as the short-time protection.

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Technical appendix

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As standards, specifications and designs change from time to time, please ask for confirmation of the information given in this publication.

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