AD30 Underground Articulated Truck Machine Electrical System Main Power Relay Caterpillar


Main Power Relay
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AD30 Underground Articulated Truck Machine Electrical System [RENR6921]
ELECTRICAL AND STARTING SYSTEM
RELAY GP
AD30 Underground Articulated Truck Machine Electrical System Main Power Relay



Illustration 1g00999567

Main power relay circuit

The components of the main power relay circuit are the key start switch and the main power relay.




Illustration 2g00995257

Dash panel

(1) Key start switch




Illustration 3g00995259

Front view of cab (front cover plate removed)

(2) Main power relay

When key start switch (1) is in the OFF position, main power relay (2) is not energized and the relay contacts are open. In this condition, 24 volt power is present at circuit breaker #1, circuit breaker #2, circuit breaker #3, and circuit breaker #4.

When the key start switch is turned to the ON position, 24 volt power is supplied via a loop receptacle to the main power relay. The main power relay is energized and the relay contacts are closed. Power is now supplied to all circuit breakers.

Information System:

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