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

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