McQuay WSC User Manual

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

McQuay WSC Specifications

General

Brand	McQuay
Model	WSC
Category	Controller
Language	English