DIESEL LOCO - Power Ground
Earth fault occur in power circuit is called power ground.
When earth faults in traction motor, traction motor cables, BKT, REV, power contactors, GR1 operates with indications. Check following items -
1. Traction motor cables are tightened properly.
2. If there are any metal or wire pieces in between BKT/Rev./Power contactors, remove it.
3. Check the wire connection of load meter.
4. If there is smell or smoke from any TM, isolate it.
Note
- If power ground comes on higher notches, work on lower notches.
- TM 4, 5, 6 can be isolate through MCO, if additional contactors (AC1, AC2, AC3) are provided on back panel, then TM 1, 2, 3 can be isolated through MCO in case of power ground.
- When GR1 operate during dynamic braking don’t use DB.
- Loco is provided with GR1 and GR2 and during engine starting, if GR2 operates. In this condition first start the engine, then reset it.
- One GR is provided in WDM-2 loco. At the time of engine starting, if GR operates. In this condition first start the engine, then reset it and note down in the repair book.
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Wheel Slip
