2.5 Replacing PCBs 443
2.5.1 Replacing the main processor board 443
2.5.2 Replacement of communications boards 444
2.5.3 Replacement of the input module 445
2.5.4 Replacement of the power supply board 445
2.5.5 Replacement of the I/O boards 446
2.6 Recalibration 446
2.7 Changing the battery 446
2.7.1 Post Modification Tests 447
2.7.2 Battery Disposal 447
2.8 Cleaning 447
3 Troubleshooting 448
3.1 Self-Diagnostic Software 448
3.2 Power-up Errors 448
3.3 Error Message or Code on Power-up 448
3.4 Out of Service LED on at power-up 449
3.5 Error Code during Operation 450
3.5.1 Backup Battery 450
3.6 Mal-operation during testing 450
3.6.1 Failure of Output Contacts 450
3.6.2 Failure of Opto-inputs 450
3.6.3 Incorrect Analogue Signals 451
3.7 PSL Editor Troubleshooting 451
3.7.1 Diagram Reconstruction 451
3.7.2 PSL Version Check 451
4 Repair and Modification Procedure 452
Chapter 21 Technical Specifications 453
1 Chapter Overview 455
2 Interfaces 456
2.1 Front Serial Port 456
2.2 Download/Monitor Port 456
2.3 Rear Serial Port 1 456
2.4 Fibre Rear Serial Port 1 456
2.5 Rear Serial Port 2 457
2.6 IRIG-B (Demodulated) 457
2.7 IRIG-B (Modulated) 457
2.8 Rear Ethernet Port Copper 457
2.9 Rear Ethernet Port Fibre 458
2.9.1 100 Base FX Receiver Characteristics 458
2.9.2 100 Base FX Transmitter Characteristics 458
3 Performance of Transformer Differential Protection and Monitoring Functions 459
3.1 Transformer Differential Protection 459
3.2 Matching Factors 459
3.3 Circuitry Fault Alarm 459
3.4 Through Fault Monitoring 460
3.5 Thermal Overload 460
3.6 Low Impedance Restricted Earth Fault 460
3.7 High Impedance Restricted Earth Fault 460
4 Performance of Current Protection Functions 461
4.1 Transient Overreach and Overshoot 461
4.2 Three-phase Overcurrent Protection 461
4.2.1 Three-phase Overcurrent Directional Parameters 461
4.3 Voltage Dependent Overcurrent Protection 461
4.4 Earth Fault Protection 462
4.4.1 Earth Fault Directional Parameters 462
P64x Contents
P64x-TM-EN-1.3 xiii
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