What Speedometer does?

It is a safety device & fitted in Locomotive Cab/Cabs in front of Driver.

It visualizes & records the speed & distance, travelled by the Locomotive at any instant as

desired.

Hence it avoids over speed & lower speed.

Over speed leads to an accident.

Lower speed causes punctuality loss.

System of working of Speedometer

The system is designed to indicate the speed and time data of the locomotive continuously and records the data on solid non volatile backup memory card.

The distance traveled (Odometer reading) can also be viewed in LCD display in loco standing condition.The system also displays the • Date• Time• Driver’s No,• Train No• Loco No.The switch mode power supply (SMPS) makes the system free from interference due to OHE as well as Walkie-talkie used by Driver on locomotive.

Power Supply Unit

Consisting of DC-DC Converter with electric isolation between input and outputs. The input power is taken from Locomotive battery

The unit produces regulated outputs for all devices of speed controller and speed sensors.

Protection

It has surge suppressor to prevent the devices from power line surge generated by Locomotive.

Interlocking

It is designed to shut down outputs if input voltage exceeds the specified range.It automatically resumes normal output supply as soon as input is in specified range.

System Description

The system consists of the following units:

Speed Sensor

Junction box

Recorder cum Indicator unit

Additional Speed Indicator

MOUNTING OF UNITS

Units Location

1. Speed Sensor Axle Box Cover

2. Speed Indicator Locomotive Cab

3. Recorder Cum Indicator do 4. Junction Box Locomotive Frame

Main Components

Speed Sensor –

A square wave generator with number directly proportional to the distance covered and with the frequency proportional to the speed of the locoNos of cycle = Distance, Nos of cycle per seconds = Speed

It has the fork to fit driving spindle, a round disc having cuts around circumference and a sensor unit.

Sensor works on 6/9 Volt DC and supply received from RCI unit.

It has optical detectors & it is so designed that when the working detector fails, automatically change over to the another.

Unit is supposed to be maintenance free as no rubbing parts.

This sensor is an optical system that operates in infrared range.

The continuous light beam of an emitter is interrupted by the rotating disc.

The receiving transistor detects the pulsating light beam & generates frequency α speed.

This frequency is transmitted via Amplifier to SMD technology to the evaluation system for processing

--ve --ve +ve +ve

O/P 1 O/P2

SEN1

SEN2

CableSS to JB

PG

Junction boxThe junction box is used for interconnection of cables

from Speed Sensor and Recorder cum Indicator unit.

It is provided for easy disconnection of Speed Sensor

in case of bogie body disconnection for maintenance

Recorder cum Indicator unit

It is the main equipment connected with all the peripherals.This unit contains the following sub- assemblies: Microcontroller card Speed Indicator Card Serial Communication Card Memory Card Input Card Output Card Mother board for Recorder Alpha- Numeric Display Data Entry Keyboard

STDMC (Speed, Time, Distance Memory Card)

It is the basic part that has:

> A Micro-controller.

> A Battery backed quartz crystal controller-timer.

> Internal Data Memory

Micro-Controller

* Continuously measures the frequency of the pulses coming from speed sensor.* Continuously computes actual speed applying wheel diameter correction from configuration memory and drives stepper motor to move pointer on dial to indicate analog reading. * Continuously computes distance data from same signal and updates kilometer count (Odometer) with LCD display.* Continuously display the real time from timer with LCD display.* Speed, Time, Distance, Dynamic braking status and fault in system/equipments data is recorded continuously in both Long & Short term Memory Card.* It drives an “ Over Speed Alarm”, when ever the configured speed limit exceeds.* It records & display latest error code in case of any fault occurs. Latest error code can be viewed in 16 character alphanumeric display.

Internal Data Memory

This is subdivided into 04 parts as:

* System Configuration Memory* Error Log* Short Term Data Memory* Long Term Data Memory

The Configuration data consists of various parameters:> Wheel diameter> Over speed limit> Mode of Recording> Sampling Rate.

Analog Speed Indicator

* Consists of a graduated dial with 270 degree scale spread over and 127 mm visible diameter.* It is driven by stepper motor & controller through microcontroller* It can indicate speed with a good stability down to a very low speed of 1 kmph

Recorder cum Indicator Unit

The central control with --controllers and flash EEPROM (Electrical Erase Permanent Read Only Memory), Internal memory for calculating & recording the journey data,

A portable flash memory card and power supply thatreceives 110/72Volts from the locomotive.It also provides analog indication of speed on dial .

This unit has the following components: 1. Memory2. RS 232 Common Port3. Parameter Set Button4. Memory Freeze Button

A 16 digits two lines alphanumeric display whichdepicts the required parameters by pressing thedisplay

* Key board

* Memory full function digit display

* Audio visual over speed alarm with LED indication

* Visual indication for Equipment/Recording fails.

RCI Unit also continuously records the following in the memory:

1.Speed in KMPH

2. Real time in Hrs, Minutes & Second

3.Dynamic brake status (ON/OFF)

4.Fault in system/Equipment

A SHORT TERM MEMORY –

It stores the most recent data of at least 10 hours of travel in loop form in respect of parameters with resolution of one second

A LONG TERM MEMORY –

It stores most recent 60 days data with a resolution of 20 second

FAULT & CONFIGURATION MEMORIES –

It records the status of the equipment& internal faults and contains customer’s specific configuration parameters to process the store data.

Speed Indicator Unit –

An independent microcomputer is used to indicate the actual speed on a dial on the front panel similar to an analog speedometer with pointer.The dial graduated in 5 KMPH intervals on 240 degree scale.

INTERNAL SETTING – Provision has been made in both the RCI and Indicator units for

manual input by the keyboard of:1.The train number in 04 digit & Driver’s code/token No in 08 digit. Once data

is stored by the locomotive Driver ,either in Indicator or in RCI the other unit will accept also.

2.Shed or Maintenance depot personnel• Locomotive No• Wheel diameter• Permissible permitted speed• Date & Time• Driver& Asst driver’s Code• Train No

Facilities Medha Auto meters Laxven

MRT912

MRT912M

MRT912 C

MRT918VI

MRT918VII

RT9 SP90S

TELPRO LAXVEN2000

Graph roll availabili

ty

Yes Yes No No No Yes No No No

Memory capacity

No 6 Hrs 60 Days

60 Days

90 Days

No 30 Min.

60 Days

60 Days

Memory freezer switch

No No Yes Yes Yes No Yes Yes Yes

Driver/train ID entry

Facility

No No Yes Yes Yes No No Yes Yes

Digital speed display

No No Yes Yes Yes No Yes Yes Yes

TYPES OF SPM

SPEED TIME DISTANCE RECORDER CUM INDICATOR

MRT – 918 PARTS:

•1.MEMORY INDICATION

•2.TOP COVER LOCK

•3.FAULT INDICATION

•4.SM POINTER

•5.16CH ALFA NUMERIC DISPLAY

•6.PS 232 SERIAL PORT

•7SELECT PARAMETERS SWITCH

•8.MEMORY FREEZE INDICATION

•9.MEMORY CARD

•10.MEMORY FREEZE SWITCH

•11.KEY BOARD

•12.MEM CARD BOARD

•13.MEM CARD BOARD LOCK

Memory Freeze Switch

CANCEL

ENTER

0 1 2 3 4

5 6 7 8 9

LOAD DISPDRIVNO

TRAINNO

MEMORYFREEZE

Memory Freeze Indicator

MEMORY FREEZE OPERATION

* The Memory Freeze switch & the indication are provided inside a sealed glass cover on the Indicator Unit.* The glass has to be broken to operate the switch.* Once the switch is operated the LED will be “ON”.* There will be no more memory recorded in Short Term Memory as soon as switch is “ON”.

There is no effect of Memory Freeze operation on the recording in Long Term Memory.

RECORDING MODES

The data memory card is recorded both short & Longmemory.

Long memory is to be recorded with samples once inevery 20 seconds.Short memory is to be recorded with samples once inevery 01 second.In this format the standard 2MB memory card can store--- more than 60 days (90 days) in Long memory --- more than 10 Hours in Short memory

The memory data is always duplicated in the Recorder cum Indicator Unit’s system memory, so that even if the memory card is not inserted also both the memories are maintained in the system memory to facilitate analysis after any unusual occurrences.

TIME BASED RECORDING

The data is recorded at pre determined interval of time.

As per specification –

The Long Term Memory is to be recorded at 20 seconds

interval.

The value can be selected between 1 – 120 seconds.

Default value is 20 seconds

DISTANCE BASED RECORDING

The data is recorded at pre determined interval of time.

The distance interval can be selected in the configuration.

The value can be selected between 20 – 400 meters.

Default value is 400 meters.

SPEED BASED RECORDING

Data can be recorded whenever speed changes by a

pre determined value (5 KMPH).

The speed interval can be selected in the configuration.

The value can be selected between 1-10 KMPH.

The default value is 5 KMPH

EVENT DRIVEN RECORDING

This mode can be combined with any of the Time based,

Distance based & Speed based modes.

Any change in digital signal creates one extra record.

It is to facilitates recording exact time of change of status

of any digital signal.

INTELLIGENT MODE RECORDING

One record is created whenever any of the following events occur:

Ж for every change in speed by X KMPH (selected speed)

Ж within this X KMPH interval also whenever the speed is changed

from acceleration to deceleration or vice versa ( Peak detection)

Ж whenever distance travelled exceeds a specified distance (selected)

Ж whenever the status of any digital input changes.

CHANGE OF MEMORY CARD

* Locomotive should be in standstill condition.

* Open the Memory card door by Key.

* Press the release Lever back just below the Card.

* Memory Card will come out.

* Put the another Card inside the box & lock the door.

Opto - electronic pulse generator

• Wax impregnated paper -- 102 mm width.• On 40-mm width, lines are printed in 10 KMPH intervals• Speed is recorded on this portion.• On 20-mm width,10 lines (1mt) are printed on this portion.•Recording STYLUS moves to and fro on these lines.• Each transition of the STYLUS corresponds to 10mts of time elapsed•On the top of this line,hours are printed numerically.• 24 hours format by an Hour Wheel and a Hammer(Controlled by µ-P)•Speed of the CHART-- It moves by 05 mm/ hour of time elapsed(HALT)•It moves 05mm/KM or 2.5 mm/KM (RUNNING)•It saves paper when loco is stopped without losing time information.

•Available in Standard Speed Scale ranges are

:0-75, 0-120, 0-150 and 0-180 Km/h.

•Conforming to RDSO Spec. No.: MP.0.3700-02 of Indian Railways •

Power Supply --- 50V -- 90V ; Power Required ---15W(Recorder),05W(Indicator)Max

Accuracy of Recording & Speed Indication -- ± 0.8% of full scale

Range of Indication -- 240 degree full scale on 120 mm visible diameter

Time display --- 06 digits, 24 hours format in hours,minutes and seconds.

Odometer range -- 07 digit with 01 KM resolution % &Accuracy -- ±0.1%,0.1KM of the distance traveledWheel Dia. Adjustment --- Possible to adjust Wheel dia in 01 mm steps.

Dial Illumination -- Through LEDs with adjustable illumination level ( 10 - 90%)

DISPLAY -- 16 character Alpha-numeric LCD display FOR S,T,D,Fault message & Diagnostic message.Memory--- 1> Long Term Memory. 2> Short Term Memory. 3> Configuration. 4> Error LogMemory Card -- 02 MB Capacity, Water proof,Sealed and without backup Battery.Weight -- 4.5 Kg(Recorder),4.0Kg(Indicator), 3.0Kg(Speed Sensor T-813M).

TECHNICAL SPECIFICATIONS:

1. Indications• Speed in Kmph in Analog Form on 127mm Dia dial with accuracy of ±0.8% of Full Scale reading

• Time in Hours, Minutes and Seconds in LCD Display with an accuracy of better than ±3 seconds per day.

• Distance Traveled (Odometer) in a six digit format whenever desired in the LCD Display.

2. Odometer     Accuracy

• 6 digit with 1 Km resolution

• ±0.1% -1 km of the distance travelled

3. Recording (On Back up     Memory)

• Speed in Kmph.• Date and Time• Distance Traveled in Metres

4. Working Voltage • Loco Battery Supply• 14V-30V (Diesel Hydraulic Locos)• 50V-90V (Diesel Electric Locos)• 60V-140V (Electric Locos)

5. Memory Capacity • 10 Hours of Run-time Minimum (Short Memory)• 60 Days of Run-time minimum (Long Memory)

6. Dial Illumination • 12V, 30 mA - LED based, long life

7. Power Requirement • 8 Watts Max.

8. Approximate Weight • 4.5 Kgs

SALIENT FEATURES

• RELIABILTY -- It does not have carbon brushes and rubbing parts in speed sensor

• LESS MAINTENANCE-- It does not require any demagnetization, matching and cleaning of commutator

• LOW POWER CONSUMPTION-- It consumes only 15 Watt• HIGH ACCURACY -- Computers are used to compute the

parameters hence accuracy obtained is much better• SAFE OPERATION -- A preset audio-visual speed alarm with

modulated tone is provided and the speed limit can be set with 01 KMPH resolution

• EASE IN INSTALLATION -- Self contained unit with minimum wiring causes ease in installation

• LOW MAINTENANCE COST-- Cost of maintenance is low as the system is basically electronic with simple mechanism

• STABLE SYSTEM -- there is no need to switch off power when the locomotive is at rest.

FAILURE ANALYSIS

SYMPTOM PROBABLE DEFECTS RECTIFICATION1.Total System not Wkg Power Cable connection Check power cable & restore loco 72V

Fuse blown,PSM DC power up to terminal BP & BN onPSM

2.No Speed Indication Speed Sensor Cable Check & restore cable connection from

SS to Jn Box & Jn Box to Indicator.

Speed Sensor Check it through Simulator

PSM Check PSM

STDMC Computer Card Replace STDMC Computer Card

3.Speed is more or less Wheel diameter setting Set it properly

4.Over speed alarm Speed limit setting Adjust setting

sounding at wrong speed

5.No Time indication & STDMC Card Replace card

recording

6.LCD Display not STDMC Card Replace card

showing parameter

7. LCD Display not Door Sensor Ensure Memory Door is closed properly

showing Driver’s No & Train No

FAILURE ANALYSIS

SYMPTOM PROBABLE DEFECTS RECTIFICATION

8.Parameter value not changing INCREMENT S/W Check Switch function

STDMC card Replace STDMC card

9.Data not recorded in Mcard 15 pin D connector on Mcard Remove & check pin

15 pin D connector on

Memory mechanism & Check STDMC Card If

its wiring wiring OK

Memory Card Replace memory card

STDMC Card Replace STDMC card

9. Data recorded but not Data Retrieval Unit Check & retrieve again

retrieved on PC Software Use proper software

Serial interface cable Check cable & connect

properly

NOTE – IN case of any difficulty in Fault Rectification or Repetitive Failures in

Service,Contact Factory for Assistance of a Service Engineer.

ERROR CODE

Sl.

No

Error code

Significance Action to be taken

1 0000 No error -----

2 0001 M-Detector feed back error at run

Check the alignment of Detector slot & set it

3 0002 M-Detector feed back error at zero speed

Check the alignment of Detector slot at 0 speed & set it properly.

4 0005 M-Detector /SM Motor faulty

Check function & connection, replace faulty parts

5 0006 G-Detector/ SM Motor faulty

Check function & connection, replace faulty parts

6 0007 LCD faulty Check and replace if faulty

ERROR CODE

Sl.No

Error code

Significance Action to be taken

7 0008 RTC faulty Replace SMTD card

8 0009 Initialization error in Memory Card

Replace Memory Card

9 0010 2 Selector faulty in

Memory Card

Replace Memory Card

10 0012 Detector M faulty Check function & connection, replace faulty parts

11 0013 Detector G faulty Check function & connection, replace faulty parts

12 0023 Odometer faulty at Reset

Check the system if necessary

Replace SMTD Card

MODEL NUMBER

The Model Number of Speed –Time- Distance Recorder

& Indicator depicts the Specification.

The six digits suffix designates the Model:

MODEL No.

X X X X X X

1st X -- Function

2nd X -- Scale Range

3rd X -- Locomotive type

4th X -- Operating Voltage

5th X -- Wheel Diameter Range

6th X -- Enclosure & Mounting