McQuay WSC Operating Manual page 91

Fault/
Log
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OM Centrif Micro ΙΙ-5
Fault
Fault/Event
Clas
Recorder Text
s
Crit Key Pad Failure
Crit TT Overcurrent Limit
Crit Curr. At Stop
NonC No Curr. At Run
NonC Phase Detection
Dis Bad RTD Detected
NonC RTD Alarm Limit
NonC RTD Comm Loss
NonC PWR DIP data Lost
NonC Jog Timer Limit
NonC Zero Speed Timer
NonC Low Control PWR
NonC Ground Fault
Crit DIP SW set Wrong
NonC Bypass Fault
NonC UTS Timer Limit
NonC External Trip
Crit Disconnect Open
NonC In-line Fault
NonC Over Curr Trip
NonC Under Curr Trip
NonC High Field Curr.
NonC Field Loss
NonC Loss of SYNC
NonC High PF Trip
NonC Low PF Trip
NonC Incomplete Seq.
Crit OL Lock
Description/Possible Solutions
The door mounted keypad has failed.
The Stop or Start button was held down while a computer reset was
performed or while power was applied to the unit.
During TruTorque ramping, the motor current exceeded the TruTorque
Overcurrent Trip level
Current flow above the no current at run setting was detected while the
starter was stopped.
Examine starter for shorted SCRs.
The motor current went below the no current at run setting while the
starter was running.
The load was disconnected while running.
The motor is being driven by the load.
A bad RTD was detected (open or shorted lead).
A RTD alarm set point was exceeded.
Communications with the RTD module was lost.
Check RS-485 wiring between the RTD module and card.
Check 24VDC RTD module power supply.
PWR DIP data lost
The jog timer (see page ) expired.
Examine reason for extended jog operation.
The zero speed timer (see page 71) expired.
• Check motor for jammed or overloaded condition
Control power is too low.
Examine control power transformer input and output voltages.
Check wiring between control power source and starter.
A ground fault current above the ground fault setting was detected.
CT burden DIP switch set incorrectly.
Set switches correctly (see page 21).
The bypass contactor failed to stay energized.
Check separate bypass for proper wiring.
Check integral bypass (RSxB units) control card fuses.
The motor was not at full speed before the UTS time expired.
Check motor for jammed or overloaded condition.
Power was removed from the external trip input on the computer card
(JC13-1).
Trip input delay is set to short
A start was commanded while the disconnect was open.
The in-line contactor did not close.
Check wiring to coil of contactor.
Check feedback wiring from auxiliary contactor to JC13-4 terminal.
check in-line fault delay
The current went above the over-current trip setting
The current went below the under-current trip setting
The field current was above the maximum field current setting.
• Examine parameter settings for improper adjustment.
• Examine field for problem causing the high field current
There was no synchronous field current.
Check wiring and motor for open field circuit.
The motor came out of synchronization while it was operating.
Examine the motor load for an overload.
Increase the field current up to the maximum for the motor.
Change from power factor control to current control mode for a varying
load
The motor power factor went above the high power factor trip
setting.
The motor power factor went below the low power factor trip
setting.
The motor was not synchronized before the sequence timer
expired.
Used to set the operation of the overload.
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