Troubleshooting Tips:
Test the VFD Control:
•
Remove power at the breaker supplying the control and perform Lock Out / Tag Out procedures.
•
Disconnect the output power wires running from the VFD to the Motor.
•
Remove LOTO and restore power to the VFD.
•
Turn the VFD on and watch for the proper start up sequence.
•
Operate the VFD as if the fan were connected.
o
The VFD should work normally as the screen indicates VFD output, not fan operation.
If the VFD does not operate properly or faults/alarms are triggered the VFD should be
replaced.
Test the Motor Housing Assembly:
•
Turn the fan off at the VFD Control and perform Lock Out / Tag Out procedures.
•
Turn the fan by hand in both directions. The fan should turn easily in both directions. If it does not
observe:
o
Look for any mechanical interference between the blades/hub and the fan frame.
o
Feel for grinding, the movement of the fan should be smooth and quiet.
o
Listen for grinding or any metal on metal contact.
•
The GFY gearmotor is a motor and gearbox. Anything that looks or sounds other than you'd expect
from a motor and gearbox is a likely indication of a problem. The Motor Housing Assembly should be
replaced.
The image below shows a control
during normal fan operation.
Speed Control
Stop/Direction Selector Switch
Integral LOTO Disconnect
These buttons are disabled
Enter/Select
Up/Down Arrows
ACS255
CONTROL TROUBLESHOOTING
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Z-TECH™
FAN
Installation and Technical Operations
®
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