Danfoss Turbocor TT Series Service Manual page 258

Compressor Status
Trigger Method
Description
Lock Out Fault INS
High Winding AFT
Temperature Fault
High Suction AFT
Superheat Fault
Page 258 of 294 - M-SV-001-EN Rev. H 1/23/2023
Troubleshooting
Ensure the liquid motor-cooling line has sufficient liquid supply and is not blocked.
l
Prevent prolonged operation at a pressure ratio less than 1.5.
l
Verify the solenoids are operational and not blocked. Refer to Section 4.6.3 S olenoid
l
Verification on page 73.
Verify the solenoid actuators. Refer to Section 4.6.3 S olenoid Verification on page 73.
l
Verify the Serial Driver. Refer to Section 4.26.3 S erial Driver Verification on page 217.
l
Verify SCR temperature sensor. Refer to Section 4.18.2.5 S CR Temperature Sensor
l
Verification on page 144.
Verify SCRs. Refer to Section 4.18.2 S CR Verification on page 142.
l
(Alarm and Fault removed from CC 4.2.X and later software)
Instantaneous Lock Out Fault:
Discharge Pressure Pre-CC 4.0.0
l
3-Phase Overcurrent Pre-CC 4.0.0
l
Inverter Error CC 4.X.X
l
If any (or a combination of) the faults listed below occurs more than three (3) times within 30 minutes,
a Lock-Out fault will occur:
Discharge Pressure CC 4.X.X
l
Inverter Temperature
l
SCR Temperature
l
3-Phase Overcurrent CC 4.X.X
l
Motor High Current
l
Inverter Error P re-CC 4.0.0
l
Rotor Starting Torque
l
Low Motor Back EMF
l
Review fault log for indication of faults recorded at time of lock out fault. Determine
l
cause of the faults and repair as necessary.
Cycle power to clear Lock-Out Fault. Active alarm/Fault Viewer in SMT allows the Lock
l
Out counter to be monitored.
Indicates the Raw Motor Thermal Readout in the Compressor Monitor Tool has exceeded
l
the maximum limit.
Ensure the liquid motor-cooling line has sufficient liquid supply and is not blocked.
l
Prevent prolonged operation at a pressure ratio less than 1.5.
l
Verify the solenoids are operational and not blocked. Refer to Section 4.6 S olenoids and
l
Coils on page 72.
Verify the solenoid actuators. Refer to Section 4.6.3 S olenoid Verification on page 73.
l
Verify the Serial Driver. Refer to Section 4.26.3 S erial Driver Verification on page 217.
l
Verify the motor thermistor. Refer to Section 4.23.4.3 S tator Thermistor Resistance
l
Verification on page 195.
Suction Superheat is calculated from t he compressor suction pressure and temperature
l
values.
Suggests high evaporator temperature combined with low evaporator pressure,
l
insufficient refrigerant charge, check valve has failed to open or the compressor has
been running in surge condition for an extended period of time.
Check the charge, system load and entering air/water conditions.
l
Verify check valve opens during compressor operation.
l