Switch 152 in an Indian Railways WAG9 locomotive is a rotary switch that controls the failure mode operation of the locomotive. In failure mode operation, the locomotive can still be driven and braked, but the control is switched from the angle transmitter to the auxiliary contacts on the TE/BE throttle. This allows the locomotive to continue operating even if the angle transmitter has failed.
To switch to failure mode operation, the driver must:
Move the throttle to the "0" position.
Acknowledge the fault message by pressing the BPFA button.
Move switch 152 to the "1" position.
The locomotive will now be in failure mode operation.
In failure mode operation, the driver must be careful to operate the throttle smoothly and gradually. The auxiliary contacts on the throttle are not as precise as the angle transmitter, so it is important to avoid sudden changes in speed.
The driver should also be aware that the regenerative braking system will not be available in failure mode operation. This means that the locomotive will have to be braked using the pneumatic brake system only.
Failure mode operation should only be used as a temporary measure. If the angle transmitter is still not working after a few minutes, the locomotive should be taken out of service and the fault repaired.
Here are some additional things to keep in mind about switch 152 failure mode operation:
The locomotive will not be able to display the speed on the speedometer in failure mode operation.
The traction control system will be less responsive in failure mode operation.
The locomotive may be more prone to wheel slip in failure mode operation.
If you are ever in a situation where you need to use switch 152 failure mode operation, it is important to be aware of these limitations. By following the proper procedures and taking precautions, you can safely operate the locomotive in failure mode until the fault is repaire
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