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51
Alarm
NO.
Steps
Alarm/Cause
Corrective Action
77
EVAP MOTOR OVERHEATED
•
TRIGGER–ON: The evaporator fan motor Internal Protector (IP-EVM) is open.
•
UNIT CONTROL:
Engine and Standby Operation: shutdown and alarm
•
RESET CONDITION: Auto Reset after a 15 minute off time when motor overload input is within
limits or alarm may be manually reset via keypad or by turning the unit off, then back on again.
NOTE: Follow the steps below until a problem is found. Once a repair or correction has been made, the active
alarm should clear itself (see reset condition above). Operate the unit through the appropriate modes to see if
any active alarm occurs. Continue with the steps below as necessary.
1
Check Evaporator Fan Blades for Free Operation
Visually inspect evaporator fan for
any foreign material or damage or
anything that will prevent the blade
and motor from turning freely
Blower wheel must be in good condition.
No sticks or other material obstructing its movement
No ice build-up preventing blade rotation.
2
Check For 12 VDC At 4MP3
a. If 12VDC
Alarm should have cleared itself.
b. If no power (0VDC)
Continue with step 2 below.
3
Check IPC Circuit
a. Use Component Test Mode to ener-
gize Evaporator Motor Contactor
circuit. (Refer to Section 5.2.2.)
FET 20 will be on.
b. Unplug the connector to the evapo-
rator fan motor and check voltage
on IP-EVM (white) wire.
12 VDC between pin 4 in the engine harness
connector and Ground.
c. Check MPQC9.
There should be 12 VDC from MPQC9 to Ground.
d. Test continuity through IPC.
Should be 0 Ohms. If the evaporator fan motor is
extremely warm, allow it to cool off, then recheck IPC
continuity.
e. Test IP circuit from evaporator fan
motor junction box to microproces-
sor.
12 VDC at 4MP3
4
Check Evaporator Fan Motor Contactor
a. Inspect the wire connections to
the contactor. (See wiring schem-
atic Section 10.)
No signs of overheating of the contactor. Wiring is
routed correctly to the contactor.
b. Check tightness of the contactor
wire connections
Tighten with screwdriver and check for discoloration
of wires.
5
Perform Pretrip
Clear Active Alarm list, then run Pre-
trip & check for any new alarms.
Any active alarms must be corrected and cleared be-
fore proceeding.
Additional steps on the next page.