Thermo King SR-2 SmartReefer2, Diagnostic Manual

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Section 5 – SR-2 Diagnostics
36 ELECTRIC MOTOR FAILED TO RUN
Page 1 of 1
Alarm Type Log, Check, Prevent, or Shutdown Alarm
Associated Alarm
Codes Alarm Code 84 Restart Null
Alarm Code 122 Check Diesel/Electric Circuit
How Alarm is Set
The alternator frequency is less than 200 Hz for 10 seconds.
How Alarm is Cleared
This alarm is cleared manually.
Considerations
This alarm becomes a log alarm if the unit is switched to diesel.
Diagnostic Procedure
1. Check the motor, motor contactor, overload relay and other associated motor circuitry. The internal pull
coil/hold coil circuits in the contactor may be defective, requiring replacement of contactor.
2. Check the voltages at the phase detect module. Battery voltage should be present on the ER wire and the 8
wire.
3. Check the standby power voltage at the phase detect module. Standby power should be available at L1, L2
and L3.
4. Check the voltage at the motor contactor coils. Battery voltage should be present on either the 7EC or 7EB
wire when the motor should be running.
5. Check for reason that the motor fails to turn the alternator, such as slipping belts, clutch, etc.
6. Check the alternator, as shown under Alarm Code 25. Pay particular attention to the AC signal on the W
circuit. From 0.5 to 13.0 volts AC should be present on the W circuit when the alternator is operating.
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02 February 2005