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Troubleshooting
82
Faults. Table 17 - Troubleshooting describes actions that may alleviate the condition or provide
valuable information for technical support.
Faults that initiate an AUTOSHUTDOWN include: MISER, RUNOUT, PWR SPLY VOLT (at high
speed), and will require Service level and higher to reset.
Table 16 Faults—causes and responses
Fault Label Meaning / Possible Causes
Operator
Clear*
Auto
Clear
Auto
Shutdown
GROUND FAULT Ground fault current out of range. X
HW BUS OV HW overvoltage. (hardware protection) X
X PHASE OC AC phase overcurrent. x = A, B, C. X
IGBT OVRTEMP IGBT overtemperature. X
VACUUM FAULT Drag power exceeds 125W. X
RUNOUT FAULT Runout higher than 2.9mil. X
MISER FAULT Miser voltage is higher than 5V. X
BEARING Magnetic bearing fault. X
AUX POWER LOW
Auxiliary power supply voltage is low when the
system is in Off mode. Configurable fault.
X
INTER PRCR COMM
Communication error with secondary DSP. System
reboots.
X
PWR SPLY VOLT
Power supply voltage is lower than 19V. (Speed
dependent; auto shutdown at high speed)
XX
UNDEF PDP INT Undefined PDP interrupt. X
CURRENT OFFSET AC motor current sensor error. X
SW OV
DC bus voltage is higher than the threshold, which is
service-configurable.
X
CHECKSUM
Calculated checksum does not match the stored
checksum.
S
CONTACTOR TIME OUT
Bus voltage/current is not stable while trying to close
or open contactor.
X
CONTACTOR CLOSE FAIL Contactor failed to close on startup. X
FAN OPEN Fan open circuit or disconnected. X
FAN SHORT Fan short circuit. X
PUMP OPEN Pump open circuit or disconnected. X
PUMP SHORT Pump short circuit. X
HW OVERSPEED Hardware detected overspeed. X
PRECHARGE PROTECTION
Stop PWM when large voltage differential exists
between internal and external bus.
X
BUS CURRENT OFFSET DC current sensor error. X
S - Indicates a Certified Service Provider will be required to reset system.
NOTE
If a fault recurs after being cleared by the operator, and the condition persists, contact your
Liebert technician.