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AUTOMATIC ALARMS AND SAFEGUARDS

PCS SWITCH AND PC LIGHT

The pneumatic control switch (PCS) is operated from the air brake system. During a safety control "penalty" or emergency air brake application, this switch opens. Traction power is reduced to first notch. The PCS OPENS (PC OPEN) light at the engineman's position will light.

To reset the PCS switch automatically :

1. Move the throttle handle to IDLE

2. Depress the safety control foot pedal and momentarily depress the penalty reset valve until the P-2A Brake Application Valve resets. Then permit the system to fully charge.

NOTE : Observe that both locomotive and train brakes have been fully released before proceeding.

WHEEL SLIP

If any wheels slip during locomotive operation, normally the following occurs :

1. A reduction in excitation and immediate sanding occurs automatically on the locomotive that is slipping.

2. If wheels continue to slip for more than two or three seconds, the WHEEL SLIP lamp (on Control Console) lights.

3. Excitation continues in reduced state.

4. When wheel slip is corrected (wheel speed under control), excitation will return to normal and sanding tapers off.

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