MP-3000a Controller
117
Code
Description
Corrective Action
56
Compressor Temperature Too High (Shutdown
Alarm)
• Compressor dischage line temperature is above
130 C (266 F). COmpressor stopped until
discharge line temperature decreases to 90 C
(194 F);
• Indicates:
• Air in refrigeration system
• Low refrigerant charge
• Defective compressor or valve plate
• Defective liquid injection system
• Wrong or defective sensor
• Operate unit on Cool and check discharge and
suction pressure gauge readings.
• Enter Manual Function Test menu and test
(operate) Injection Valve to determine if valve
opens (energizes).
• Check compressor discharge sensor resistance.
Resistance must be 100,000 ohms at 25 C (77
F).
• Check discharge line temperature with a
separate electronic thermometer and compare to
“HIGH PR TEMP” shown in the Data menu of
controller.
NOTE: Unit will operate normally without
compressor sensor. However, controller
compressor high temperature protection is not
active.
58
Phase Sensor Error (Check Alarm)
• Occurs during Pretrip (PRI) or Function test only.
• During Phase Sensor Test, amperage difference
between correct and wrong condenser fan
rotation is more than 0.2 amps.
• Indicates:
• Defective phase relay
• Defective relay board
• Defective relay board cable No. 2
• Start a Function Test. During step F1.05, check
whether the phase relays on relay board receive
a signal (LED energizes). Verify that the relays
respond and shift to reverse phase.
59
Delta Current Error (Alarm)
• 100% ampere difference between current
phases.
• Indicates:
• Open connection on one phase of power
supply to a motor or heater element
• Enter Manual Function Test menu and test
(operate) each 3-phase component to locate
defective connection.
60
Humidity Sensor Error (Check Alarm)
• Occurs during Pretrip (PTI) test only.
• Relative humidity reading not between 20% and
95%.
• Indicates:
• Sensor disconnected
• Wrong controller software configuration
• Defective sensor
• Check sensor connections.
• Check controller configuration for correct
humidity setting.
• Replace sensor.
Summary of Contents for CRR-40 119
Page 4: ......
Page 16: ...Safety Precautions 16...
Page 18: ...Service Guide 18...
Page 20: ...Model Features 20...
Page 32: ...Specifications 32...
Page 120: ...MP 3000a Controller 120...
Page 160: ...Wiring and Schematic Diagrams Index 160...
Page 161: ...161 MPC2000 Wiring Schematic...
Page 162: ...162 MPC2000 High Voltage Wiring Diagram...
Page 163: ...163 MPC2000 Low Voltage Wiring Diagram...
Page 164: ...164 MPC2000 WCC Wiring Schematic...