ACT (RS) ABB Loco (English) (19. FAILURE MODE OPERATION)

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ACT (RS) ABB Loco (English) (19. FAILURE MODE OPERATION)

January 10, 2021, 12:08 PM

Failure Mode Operation

This mode allows the locomotive to operate even if the angle transmitter of the TE/BE throttle has failed.

In this mode, driving and electrical braking are controlled by the auxiliary contacts on the TE/BE throttle.

Driving in failure mode

Driving in failure mode becomes necessary if the difference between auxiliary contacts and the absolute value of the angle transmitter is greater than 25% of the full range because of a defective master controller.

The following steps are initiated with a time delay of 2 sec:

1. Traction is set to 0 by the MCE.

2. A priority 2-fault message is displayed.

3. The driver must now move the rotary switch “152-Failure Mode Operation” in the machine room (SB1) into position ‘1’. This deactivates the angle transmitter.

4. The driver must move the TE/BE throttle into position “0”.

5. The driver must acknowledge the fault message.

6. The driver can now select a new TE/BE throttle value carefully. Position‘0’-Fine control though out the range by angle transmitter. Position ‘1’-fine control in steps though auxiliary contacts.

Loco Brake Testing:

1) Apply loco brakes by SA-9

2) Ensure that brake cylinders registered 3.5kg/cm2 pressure in WAG9 & 5 Kg/CM2 disk brake pressure in WAP5.

3) Release parking brakes and release A-9.

4) Operate MPJ to forward.

5) Move throttle in traction and give 45 % or 150 KN tractive effort in WAG9 & 30% or 100 KN. tractive effort in WAP5.

6) Loco should not be moved.

Note:- Presently there is no procedure for loco brake testing approved by RDSO. Same to be confirmed by RDSO or CLW

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