Condenser Motor Overheated
refrigeration
Description
Condenser fan motor internal protector is open and High Discharge Pressure is not active; engine and unit shut down with alarm, or refrigeration shuts down with alarm and PSCON stays energized.
Activation Conditions
The condenser fan motor Internal Protectors (IP-CDM1) circuit is open and alarm 00013 High Discharge Pressure is not active.
Unit Behavior
Engine Operation: Engine and unit shutdown and alarm. Electric Operation: Refrigeration system shutdown and alarm with PSCON still energized.
Reset Conditions
Auto Reset when motor overload input is within limits, or change to engine Operation, or alarm may be manually reset via keypad or by turning the unit off, then back on again.
Corrective Actions
1. Check Condenser Fan Blades for Free Operation - Visually inspect condenser fan blades for any foreign material or damage or anything that will prevent the blade and motor from turning freely Fan blade must be in good condition. No sticks or other material obstructing it’s movement No ice build-up preventing blade rotation. 2. Determine if the IP is open a. Check for Continuity between PM-30 and PM-11. It should be 0 Ohms. If condenser fan motor is extremely warm, allow it to cool off, then recheck IP continuity. b. If open, continue with step 6 below. 3. Check Fuses - Check fuses F11, F36, F37 and F38. Verify correct fuse, and check fuse holder for damage, see Figure 2.4, Figure 2.5. Replace fuse(s) as required. Clear alarms, restart and check for repeat alarm(s). 4. Check Condenser Fan Motor Contactor a. Inspect the wire connections to the contactor. (See wiring schematic Section 10.2.) 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 Pretrip and check for any new alarms. Any active alarms must be corrected and cleared before proceeding. 6. Check Condenser Fan Motors - 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 2.10 for correct electrical values. • If motor tests good, check the DC IP circuit to microprocessor. Alarm continued on next page...