Section 5 – SR-2 Diagnostics
90 ELECTRIC OVERLOAD
Page 1 of 2
Alarm Type
Log, Prevent or Shutdown Alarm
Associated Alarm
Codes
Alarm Code 84 Restart Null
How Alarm is Set
1. This alarm will be set during electric mode operation if the microprocessor determines that the electric
motor overload relay (EOL) has tripped.
2. Alarm conditions are only active when 3∅ power is connected (ER input is high).
How Alarm is Cleared
This alarm is cleared manually.
Considerations
This alarm becomes a Log alarm if the unit is switched from electric mode to diesel mode.
Diagnostic Procedure
CAUTION: High voltage is present any time the unit is connected to standby power. Exercise extreme
care.
1. Check the electric motor for current draw. Refer to the motor nameplate for the Full Load Amperage rating
(FLA) of the motor.
2. Check the setting of the motor overload relay. It should be 10% greater than full load rating of the motor.
3. Check the EOL-01 circuit for continuity from J6 pin 2 on the interface board to the overload relay.
4. Check for continuity between the overload relay terminals 95 and 96. The contacts should be normally closed.
5. Check the CHHV circuit for continuity to chassis ground.
5-69
02 February 2005
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