C3 Evap Motor Overheated
refrigeration
Description
The third compartment evaporator fan motor Internal Protector is open; compartment 3 only shuts down.
Activation Conditions
The third compartment evaporator fan motor Internal Protector (IP-EVM) is open.
Unit Behavior
Engine and Electric Operation: Shutdown compartment 3 only.
Reset Conditions
Alarm 00111 Check 3EVCON Coil is not active. Auto Reset after a five 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.
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, with no sticks or other material obstructing its movement. Check for ice buildup preventing blade rotation. 2. Check Motor IP - Disconnect power plug at motor, Test continuity through IPC. Test IP circuit for continuity using ohmmeter. Should be 0 Ohms. If the evaporator fan motor is extremely warm, allow it to cool off, then recheck IPC continuity. NOTE If Motor IP shows 0 ohms, it indicates that this motor may not be the problem, check the next Remote Evaporator Motor IP. If none of the motors show an open IP, continue with the next step. 3. Check For Voltage a. Use Component Test mode to energize the C3 Evaporator Motor Contactor. (Refer to Section 5.2.4.) Verify 12 VDC between A1 and A2. 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. Check voltage at pin 4, should read 12VDC. 4. Check Evaporator Fan Motor Contactor a. Inspect the wire connections to the contactor. (See wiring schematic Section 8.) Verify no signs of overheating of the contactor. Check that 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 the Active Alarm list, then run a Pretrip and check for any new alarms. Any active alarms must be corrected 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 Section 8.10.10. If closed, then an intermittent IP circuit is suspect. Check phase to phase and phase to ground for short or open circuits. Refer to Section 2.11 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 Section 2.11). Check voltage on each phase (must be at within limits shown in Section 2.11.)