datalogger logics.ppt

7/28/2019 Datalogger logics.ppt

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Yard Diagram of a Two Road

Station


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TrackTracks may Fail or Bob due to

1. Conductors lying across

2. Improper Ballast

3. Heavy Rain4. Mischief

5. Relay Problem


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SignalProblems related to Signals

1. Fusing Of signal Lamp

2. Blanking of Signal

3. Signal Raised Up

4. Signal lamp to be replaced forpreventive maintenance

5.Conflicting Aspects

6.Signal Passing at danger


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Point Machine

1. Friction in movement

2. Loose Packing of Point

3. Point Fail

4. Point not setting due to obstruction

5. Point Button Not Properly Pressed-Premature release

6. Point M/c drawing High Current

7. Relay Bobbing


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Point Loose Packing


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Obstacle In Point


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Button

1. Button Stuck Up2. Premature Release

3. Unnecessary Pressing of Button

4. Improper Sequence


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Circuit

1 Progression Sequence Interrupted

2 Contact offering High Resistance

3 Fuse Blown Off


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Analog Voltages & Currents-AC


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So what we require may be a

Recording System

To Record all theinformation relating to the

yard i.e Data Logger


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Computer Connectivity

Single Data-loggercan be connected to Computerfor

storing & processing of the Relay and Voltage information


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A Computercan also take data, through an FEP,

connected to a network of Data-Loggers.

Computer Connectivity


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In a computerall this data is stored in the Hard Disk.

Present Day Hard Disks, of size 40GBcan hold

nearly 3 years of information of networks, having an

average of30 Data-loggers.

Computer Memory

Hard Disk

Computer


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Front End Processor(FEP)The data of the network is collected by theFEP (Front End Processor), which in turn istransmitted to the computer

FEP acts as a buffer between the Computerand the Network


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Input ID-Packet Structure

Now we need to Know the Relay and its

statusWhat about this?

The Input ID i.e the Number of the contact

where it is connected to the Data logger,

and the change(Status ) are also sent along.

Serial Type Time Input ID StatusDLNo


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Relay1 On/Off Time1

Serial Type Time Input StatusDLNo

Relay2 On/Off Time2

Relay 3 On/Off Time3

1.

2.

3.

Analog2 On/Off Time44.

Serial Number-Packet Structure


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CRC-Packet Structure

The information when passed in a network

may be corrupted due to noise etc.How can

you identify this ??CRC : Cyclic redundancy Check- is the best

validation algorithm to identify the error, if

any in the data packets.This Byte relates tothis checking mechanism.


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Printout of Status of Relays at

Data-LoggerDate-Time Relay Status


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What is the Use of Relay On-Off

information Let us Take an example of a Point M/c working

Normal Sequence Failure situation

Nwkr & Rwkr both down

for 25 seconds


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Point Normal operation


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Point Failure condition

18 RCR Down 03/05/2003 12:43:46:375

18 NCR Up 03/05/2003 12:43:46:516

18 NWKPR2 Up 03/05/2003 12:43:49:672 made to normal

18 NCR Down 03/05/2003 12:43:56:125

18 RCR Up 03/05/2003 12:43:56:266

18 NWKPR2 Down 03/05/2003 12:43:56:359 attempt to make reverse

18 RCR Down 03/05/2003 12:44:15:312

18 NCR Up 03/05/2003 12:44:15:469

18 NWKPR2 Up 03/05/2003 12:44:18:625 made to normal

18 NCR Down 03/05/2003 12:44:20:734

18 RCR Up 03/05/2003 12:44:20:844 Attempt to make reverse

18 NWKPR2 Down 03/05/2003 12:44:20:93818 RCR Down 03/05/2003 12:45:28:562

18 NCR Up 03/05/2003 12:45:28:719 * tried to make normal

18 NCR Down 03/05/2003 12:45:29:953 *

18 RCR Up 03/05/2003 12:45:30:078 5 attempt to make reverse *** (no fault decla

18 RCR Down 03/05/2003 12:47:06:01618 NCR Up 03/05/2003 12:47:06:469


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Loose packingFailure Condition Normal operation

NWKR status change

when TPR Down


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Signal blanking

Failure condition Normal operation

All the ECRs Down for 10

seconds


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Filtering Analog Channels


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Selected Analog Channel Report

A l Ch l G h


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Analog Channel Graphs

Variations

in Supply


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Block Diagram of the Process Involved - 1


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Fault Entry

SoftwareLogic NMDL

Software

Data Packets

From DataLoggers

Fault

Files

Fault

Conclusions

1. Online Relay Status

2. Online Analog Status

3. Online Simulation

Computer

Hard Disk

----------------------------

-------------

-------------

g


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TPR Fail

Logic Used

IF TPR1, TPR2, TPR3 are in sequence thenIf TPR1 UP - TPR2 DOWN- TPR3 UP

Triggering Relay : TPR2

TPR Bobbing

Logic Used

IF TPR DOWN TO UP OR UP TO DOWN Withinthe time interval.

Examples of common Logics

T k f il


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Track failure

Failure Condition Normal operation

A36ATpr,A37BTPR,A39ATpr are in sequence

Track Dn condition occurring in maintenance of

tracks resulted in Track fail Logic wrongly


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Point MachineFailNWKR is down and RWKR is down for

more than given time interval.

Loose packingWhen TPR1 is down, then the

corresponding NWKR, RWKR should notchange their status. Triggering signals areNWKR, RWKR.

Examples of common Logics


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Point fail

Failure conditionNormal operation


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Loose packing

Failure Condition Normal operation


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Quick I dentif ication of fail ures


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Circuit FailureHR Circuit failure. Button1, Button2 are up and after time

interval if HR is DOWN

Quick I dentif ication of failures

Relays whichattained

improper

status


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Validity Of Entered information

The Relay Name & Contact Type is to becarefully noted for all the inputs and entered

in the database at the computer end, asnegative logic is used for Back contacts.


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The Fault Logics usedshould be tried and tested

regularly and well tuned forbetter conclusions.

Validity Of Entered information


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Signal Down Count


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Signal Down Count


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Battery Discharge condition


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F luctuations in a weak Battery


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F luctuations in a weak Battery


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What Have you Learnt in this

Module??? What is a Data-logger?

How is it storing the changes in the Relay status ?

How a better analysis of sequence of relayoperations and analog voltages, be done ?

How a better predictive and preventive

maintenance is possible?

What are the common problems in relay contacts

and voltage channels?

datalogger logics.ppt

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