GE P742

Troubleshooting
P74x/EN TS/N
a7
MiCOM P74
1, P742, P743
(TS) 12-
1
TS
CONTENTS
1. INTRODUCTION 3
2. INITIAL PROBLEM IDENTIFICATION 4
3. POWER UP ERRORS 5
4. ERROR MESSAGE/CODE ON POWER-UP 6
5. OUT OF SERVICE LED ILLUMINATED ON POWER UP 8
6. ERROR CODE DURING OPERATION 9
7. MAL-OPERATION OF THE RELAY DURING TESTING 20
7.1 Failure of output contacts 20
7.2 Failure of opto-isolated inputs 20
7.3 Incorrect analog signals (P742 or P743) 21
7.4 PSL editor troubleshooting 21
7.4.1 Diagram reconstruction after recover from relay 21
7.4.2 PSL version check 21
8. REPAIR AND MODIFICATION PROCEDURE 22