7–43
62-11640
00077
EVAP MOTOR OVERHEATED
• ACTIVATION: The evaporator fan motor Internal Protector (IP-EVM) is open.
• UNIT CONTROL: Engine and Electric 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.
CORRECTIVE ACTIONS:
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 mate-
rial obstructing its movement. No ice build-up preventing blade rotation.
2.
Check For 12 VDC between 2CCB01 and 2CCB34
a. If 12VDC, then alarm should have cleared itself.
b. If no power (0VDC), then continue with steps below.
3.
Check IPC Circuit
a. Use Component Test Mode to energize Evaporator Motor Contactor circuit. (Refer to
b. Unplug the connector to the evaporator fan motor and check voltage on IP-EVM (white) wire.
Check voltage at pin 5, should read 3 VDC. No voltage indicates an open from pin 5 to 2CCB34.
Check voltage at pin 4, should read 12VDC. No voltage indicates open from pin 4 to 2CCB01.
c. 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.
4.
Check Evaporator Fan Motor Contactor
a. Inspect the wire connections to the contactor. (See wiring schematic
.) Check for
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 discol-
oration of wires.
5.
Perform Pretrip
Clear Active Alarm list, then run Pretrip & check for any new alarms. Any active alarms must be cor-
rected and cleared before proceeding.
6.
Check Evaporator Fan Motor
Disconnect power plug at motor Test IP circuit for continuity using ohmmeter. If IP remains open after
a 30 minute cool down period, and motor feels cool to the touch, remove and replace motor. Refer to
If closed, then an intermittent IP circuit is suspect. Check phase to phase and phase to ground for
short or open circuits. Refer to
for correct electrical values.
If motor tests good, check the DC IP circuit to microprocessor.
7.
Check Motor Operation
Turn the unit ON. Check current on each phase (must be less than shown on
voltage on each phase (must be at within limits shown in
Summary of Contents for Vector 8500
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