Troubleshooting - McQuay WSC Operating Manual

Phase Order
Description
The line phasing parameter sets the phase sensitivity of the starter. This can be used to protect the
motor from a possible change in the incoming phase sequence. If the incoming phase sequence
does not match the set phase rotation, the starter will display phs err while stopped and will fault if
a start is attempted.
Values
The line phasing can be set to:
• INS - will run with either phase sequence
• ABC - will only run with ABC phase sequence
• CBA - will only run with CBA phase sequence
Default
The default value for the phase sensitivity parameter is INS.

Troubleshooting

The following troubleshooting charts can be used to help solve some of the more common
problems that occur.
Table 40, Motor will not start, no output to motor.
Display
Fault Displayed.
Watchdog LED on.
Display is blank.
Stopped
No line
Table 41, Motor rotates but does not reach full speed.
Display
Fault displayed.
Accel or Running
Table 42, Deceleration profile not operating correctly.
Motor stops too quickly.
Time seems correct but motor
surges at start of decel.
Time seems correct but motor
stops before cycle complete.
Time seems correct but water
hammer occurs at end of cycle.
Table 43, Motor stops while running.
Display
Fault displayed.
Display is blank.
Stopped
88
Cause
Shown on display.
CPU card problem.
Control voltage is absent.
FU1 on power card.
Ribbon Cables.
Control Devices
Display buttons disabled.
Missing at least one phase of main
power
Cause
Shown on display
Mechanical problems.
Abnormally low line voltage.
Display
Time setting. or improper level
TruTorque DCL End Torque
TruTorque DCL End Torque
Cause
Shown on display.
Control voltage is absent.
FU1 on power card
Control devices.
See fault code table.
Consult McQuayService.
Check for proper control voltage.
Replace FU1.
Check ribbon cables.
Check control devices
Enable display buttons.
Check power system.
See fault code table.
Check for load binding. Check motor.
Fix line voltage problem
Cause
setting.
Decel level 1
Decel level 2.
Decel level 2.
See fault code table.
Check control wiring and voltage.
Replace fuse.
Check control system.
Solution
Solution
Solution
Contact McQuayService
Contact McQuayService
Contact McQuayService
Contact McQuayService
Solution
OM Centrif Micro ΙΙ-5