McQuay WSC Operating Manual page 89

Table 44, Other situations.
Display
Power Metering not
working.
TruTorque
not working.
Motor
voltage
with steady load.
Erratic operation.
Accelerates too
quickly.
Accelerates
slowly
Motor overheats.
Motor short circuit.
Fans do not operate
Display buttons
don't work.
OM Centrif Micro ΙΙ-5
CT installed wrong.
Ramp
CT installed wrong.
current or Motor
fluctuates Energy saver
Power connection.
Loose connections.
Ramp time.
Initial current.
Maximum current setting.
Kick Start.
Improper FLA setting.
Initial torque.
Maximum torque.
Ramp time.
Initial current.
Maximum current setting.
too
Kick Start.
Improper FLA setting.
Initial torque.
Maximum torque.
Duty cycle.
High ambient.
Too long acceleration time.
Wrong overload setting.
Too long jog cycle.
Wiring fault.
Power factor correction capacitors
(PFCC) on starter output.
Wiring.
Fuse.
Fan failed.
Display ribbon cable.
Display faulty.
Cause
Fix CT installation. White dot to line
side.
Fix CT installation. White dot to line side
Verify motor is operating correctly.
Set energy saver to off.
Shut off power and check connections
Shut off all power and check
connections.
Contact McQuayService
Contact McQuayService
Cool between starts.
Provide better ventilation.
Reduce motor load.
Select correct overload setting.
Jog operation reduces motor cooling and
increases current. Shorten jog cycle.
Identify fault and correct.
Move PFCC to line side of starter.
Check wiring and correct.
Replace fuse.
Replace fan.
Check cable on back of display.
Replace display.
Solution
89