** Fault Message **
SS01: Main Power F0107P1
Main Power PRECHARGE OR MAIN CONTACTOR STUCK ON main converter blocked.
Introduction
Fault No. F0107P1 indicates a serious issue with the “Main Power Supply” of the locomotive – specifically a “PRECHARGE OR MAIN CONTACTOR STUCK ON” condition. This results in the “MAIN CONVERTER Being BLOCKED” and the VCB (Vacumm Circuit Breaker) getting tripped. In this scenario, one Bogie can bbe isolated, and the locomotive can be operated in limited mode/ Half Traction.
Lamp Indication
LSDJ & BPFA will glow, LSFI will start flickering.
Effect
VCB will trip.
Action to be taken by Loco Pilot
- Bring Throttle to “0” position.
- Try to clear block section in Coasting.
- Acknowledge fault by pressing the BPFA button.

- Switch OFF and then ON the MCE (Master Control Electronics) once again.
- Then Raise the Pantograph
- Close the VCB
- and Resume Traction.

If not successful:
Check the DDS Background Message:
- Then clear block section with one Bogie in service by isolating a Traction Converter as per following message.
If SLG1: 0037 or 0039 appears:
- Then isolate Traction Converter-1 (SR-1) by switching OFF the following:
- MCB – 127.1/1
- MCB – 127.11/1 (IGBT).
- (Located in SB-1 panel)

If SLG2: 0037 or 0039 appears:
- Then isolate Traction Converter-2 (SR-2) by switching OFF the following:
- MCB – 127.1/2
- MCB -127.11/2 (IGBT).
- (Located in SB-2 panel)
- Note: These MCB’s are provided for Traction Isolation.

- Inform TLC and act as per instructions.
- If not successful within 20 minutes ask for relief loco.
** Fault Message **
SS01: Main Power F0107P1
MAIN POWER ISOLATED VCB inhibited Loco is dead.
Lamp Indication
LSDJ & LSFI will glow
Effect
VCB will trip
Action to be taken by Loco Pilot
- Switch OFF and then ON the MCE once again.
- Raise panto
- Close VCB
- and resume traction.

- If VCB cannot be closed:
- Shut down the locomotive.
- Ask for a relief loco within 20 minutes.
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