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