A/C Current Over Limit
electrical
Description
High voltage amp draw is over the listed limit for more than 10 seconds; engine operation shuts down refrigeration and alarms, and electric operation shuts down refrigeration and alarms with PSCON still energized.
Activation Conditions
The high voltage amp draw is over the limit shown in the following table for more than 10 seconds. CONDITION DRAW Engine High / Low Speed, Standby Cool or Pretrip / Engine Off 30A Engine High Speed Heat 18A Engine Low Speed or Standby Heat 14A Engine High Speed Defrost (With heaters energized) 16A Engine Low Speed or Standby Heat Defrost 12A Engine High/Low Speed or Null 8A Engine Low Speed or Standby Null 8A Engine or Standby Natural Defrost (when heaters are de-energized) 10A
Unit Behavior
Engine Operation: Refrigeration system shutdown and alarm. Electric Operation: Refrigeration system shutdown and alarm with PSCON still energized.
Reset Conditions
Auto reset after 15 minutes or alarm may be manually reset via keypad or by turning the unit OFF, then back ON.
Corrective Actions
1. 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. 2. Check Configurations for Correct Maximum Amps Settings a. Check DIESEL MAX GEN AMPS configuration setting. Setting should be 24 - 25 Amps. Maximum recommended setting is 25 Amps. Minimum recommended setting is 22 Amps. b. Check STANDBY MAX GEN AMPS configuration setting. Setting should be 22 - 25 Amps. Maximum recommended setting is 25 Amps. Minimum recommended setting is 22 Amps. c. Check STARTUP MAX AMPS configuration setting. Setting should be 15 - 19 Amps. Maximum recommended setting is 19 Amps. d. Check DIESEL OFFSET MAX AMPS configuration setting. Setting should be 4 Amps. 3. Check for Electrical Failure In System a. Check electrical motors. Visually inspect condenser fans and evaporator fan for damage to motor or fan blade, or for foreign material obstructing the movement of the fan. Listen for noise caused by failed bearing or motor obstruction. b. Check for defective wiring. Check for discolored wiring at contactors and loose connections. c. Check for defective contactor. Remove and replace any suspected contactor(s). Alarm continued on next page... 00023 Low Refrigerant Pressure (continued) 4. Check High Voltage Components Amp Draw (with the unit operating) a. Check condenser fan amp draw on all legs. (CDCON) b. Check evaporator fan motor amp WARNING draw on all three legs (1EVCON) c. Check compressor amp draw on all three legs. (CCON) d. Check heater amp draw. (1HTCON1, 1HTCON2, 2HTCON1, 2HTCON2, 3HTCON1 and 3HTCON2 - if applicable) WARNING ! Caution and good electrical practices must be used when working around and with high voltage circuits. Verify that all three actual amperage readings for each component are within 10% of each other, and are within the values shown in Section 2.10. 5. Check Generator Voltage (If Used When Alarm Occurred) - Check voltage at GENCON L1-L2, L1-L3, L2-L3. Must be within voltage limits shown in Section 2.10. 6. Check Power Source Voltage (If Used When Alarm Occurred) - Check voltage at PSCON L1-L2, L1- L3, L2-L3. Must be within voltage limits shown in Section 2.10. 7. Check Voltage Output From Contactors a. Check voltage at GENCON T1-T2, T1-T3, T2-T3. Must be within voltage limits shown in Section 2.10. b. Check voltage at CCON with compressor operating. T1-T2, T1-T3, T2-T3. Must be within voltage limits shown in Section 2.10. 8. Verify Accuracy of AC Current Sensor (CT1, CT2, and CT3) a. Put microprocessor in PC mode. Refer to Section 5.3.2. Must have 0 AC1 Amps and 0 AC2 Amps in Unit Data. b. Use a clamp on ammeter to measure current draw of all three legs of the T side of GENCON. Meter reading should be the same as Unit Data: Compare meter reading to Unit Data in PC mode. Compare meter reading to Unit Data with unit under load. 9. Defective Overload Ground Fault (OGF) Detector - Opens prematurely. Remove and replace.