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AUTOMATIC ALARMS AND SAFEGUARDS

 

NO BATTERY CHARGE LIGHT (WHITE)
(See Figure 2)

If the engine is running and the engine control switch (EC) is not in START position and the battery charging equipment fails, then the NO BATTERY CHARGE lamp (white) will light and the alarm bell will sound. The light will also come on if the engine is not running, but the battery switch is closed. Under this condition, a fault does not necessarily exist.

GROUND RELAY
(See Figure 2)

  1. Ground Relay operation :

  1. If a ground occurs in the main power circuits, the ground relay operates to remove power from the traction motors and sound the alarm bell. In freight service it also automatically reduces the engine speed to idle. An indicating light (Ground Relay Tripped) on the engine control panel will light, indicating that a fault has occurred.

  2. If a ground occurs in the control circuits, the ground relay may operate during the engine cranking cycle. Report this condition.

  1. To reset relay :

  1. Return the throttle to IDLE.

  2. Push in the trainline ground relay reset button on the engine control panel.

  3. Advance the throttle handle. If the ground relay stays in, continue normal operation.

NOTE : On locomotives equipped with a trainline ground relay reset, a tripped relay is indicated by a warning light. To reset the relay, return the throttle handle to IDLE. Wait 15 seconds, then press the reset button. The same reset button is pressed and the same resetting procedure applies when an alternator overload relay (GOLR) has tripped (OVRLD light).

  1. Additional :

  1. Freight Service - If the ground relay immediately operates a second time, the affected unti must not be operated. The unit must either be shut down or, if necessary, the engine can be left running by turning the EC switch to START. This takes the unit "off line." Attempt to clear the fault by using the traction motor cut-out switch to cut out the traction motors.

  2. Passenger Service - If the ground relay immediately operates a second time, return the throttle handle to IDLE and proceed as directed by railroad rules.

NOTE : When the ground relay cut-out switch (GRCO) is opened, the unit will shut down. This is to prevent running the locomotive without electrical protection. Attempt to clear the fault by using traction motor cut-out switch to cut out traction motors.

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