Motor/System
Status Description
Trigger
Method
Troubleshooting
l
Compare the Back EMF value to the displayed readings in the Compressor Monitor Tool and Fault
and Event Log details to determine conditions related to the fault.
l
Permanent damage to Back EMF can be caused by insufficient motor cooling, repeated overheating
of cavity, faulty Inverter, faulty BMCC, repeated Rotor Starting Torque or Single phase Over-Current
faults. Refer to Inverter Error on page 260.
l
Verify the Inverter. Refer to Section 4.22.2 Inverter Verification on page 176.
l
Verify the Stator. Refer to Section 4.23.4 Motor Verification on page 195.
Generator Mode
Active
DFT
l
Indicates, at greater than 0 RPM, the measured actual DC Bus voltage has fallen below the Generator
Mode Enabled Level value. Also, could be electronic “noise” when no actual drop in voltage has
occurred.
l
Measure the incoming main AC voltage.
l
Measure the DC bus voltage using the DC Bus Test Harness.
l
Compare the measured voltages to the displayed readings in the Compressor Monitor Tool and Fault
and Event Log details to determine conditions related to the fault.
l
Typically, this fault is recorded when power to the compressor is removed while it is running.
EEPROM
Checksum Fault
INS
l
Indicates there is an error reading the EEPROM in the BMCC.
l
Perform a bearing calibration and save to EEPROM, cycle the power.
l
If the error is still present, the BMCC must be replaced.
SCR Ripple
Voltage Fault
AFT
l
Suggests that a voltage or current imbalance may exist between the incoming AC phases to the
SCRs.
l
Measure the difference in current and voltage between the AC phases.
l
If there is a current imbalance (more than 5%) between the phases, verify the incoming AC power
supply.
l
Review the Compressor Monitor Tool for SCR Voltage Ripple readings at the time of the fault.
l
Phase imbalance can also be caused by a faulty SCR, SCR Gate, Gate control from the Soft Start
Board, or a faulty power capacitor.
l
Verify the SCRs. Refer to Section 4.18.2 SCR Verification on page 142.
l
Verify the Soft Start Board. Refer to Section 4.14.2 Soft Start Verification on page 115.
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Summary of Contents for Turbocor TT Series
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