5.2.2 Motor/System Faults Troubleshooting
Table 5-8 Motor/System Status
Motor/System
Status Description
Trigger
Method
Troubleshooting
Motor Single
Phase
Overcurrent
Fault
AFT
l
One (1) phase of the Inverter to motor is generating high current.
l
Review Fault and Event Log details to determine conditions related to the fault. This fault can be a
result of liquid carryover, a loss of shaft magnetic strength, see Back EMF is Low fault, or Inverter
failure. Refer to Inverter Error.
l
Verify the Stator. Refer to Section 4.23.4 Motor Verification on page 195.
l
Verify the Inverter and the Inverter cable connections. Refer to Section 4.22.2 Inverter Verification on
page 176.
l
This fault can be related to BMCC Inverter switching control. Verify the BMCC. Refer to Section 4.27.2
BMCC Verification on page 220. If fault/event logs show occurrence of Single Phase Over-Current
fault after one Inverter Error, the Inverter should be verified and may require replacement.
DC Bus
Overvoltage
Fault
AFT
l
Suggests that the DC bus voltage is above the Maximum DC Bus Voltage.
l
Measure the incoming main AC voltage.
l
Measure the DC bus voltage using the DC Bus Test Harness. Refer to Section 4.21.2 DC Bus Voltage
Verification on page 167.
l
Compare the measured voltages to the displayed readings in the Compressor Monitor Tool and
details in the Fault and Event Log to determine conditions related to the fault.
l
Correct the incoming main AC voltage if it is higher than the maximum recommended value for the
application.
l
If the measured DC bus voltage exceeds the Maximum DC Bus Voltage and incoming main AC
voltage is correct, verify the Soft Start. Refer to Section 4.14.2 Soft Start Verification on page 115.
l
All 3-phase voltage information displayed in the SMT is calculated from DC bus voltage, as measured
by the Inverter, verify the Inverter and its connections. Refer to Section 4.22.2 Inverter Verification on
page 176.
Motor
Overcurrent
Fault
AFT
l
Suggests AC input voltage is too low or the compressor is overloaded.
l
If this fault occurs three times within a 30-minute period, a Lock-Out Fault will occur.
l
Verify the 3-phase AC input voltage is above the minimum recommended value for the application.
l
Heavy, saturated gas can cause the motor to overwork and generate high current. Ensure
superheated gas is entering the compressor suction port.
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.
Inverter Error
INS
l
Indicates there is an error within the Inverter Control Board or no BMCC communication with the
Inverter.
l
Pre-CC 4.0.0 - If this fault occurs three (3) times within a 30-minute period, a Lock-Out Fault will
occur.
l
CC 4.X.X - Instantaneous Lockout Fault
l
Verify the Inverter and the Inverter cable connections. Refer to Section 4.22.2 Inverter Verification on
page 176. If the Inverter Error fault persists after the Inverter is verified, it should be replaced.
l
Review the Fault and Event Log for recorded occurrences of this fault. Any occurrence of Single
Phase Overcurrent, Back EMF is Low or Rotor May Be Locked faults immediately following an Inverter
Error fault most likely indicates a faulty Inverter.
Bearing Alarm
Active
INS
l
If a bearing fault type is present, the Bearing Alarm is triggered in the Motor/Status section.
l
This is not an actual fault, only an indication that a fault has occurred in the Bearing section. Refer to
Section 5.1.2 Fault Types on page 251.
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