BIG ASS FANS 4900 Manuel D'installation page 27

Review the troubleshooting tips listed below before contacting Customer Service for support.
Symptom
A popping noise is coming from
the fan.
Airfoil noise occurs when
airfoils are not tightened to the
specified torque.
The fan will not start.
The VFD generates radio
frequency (RF) noise.
VFDs generate RF noise in many
ways, but this can be prevented
using proper wiring practices.
The motor makes noise when
fan speed is increased.
The fan wobbles during
operation.
TROUBLESHOOTING
Solution
Disconnect the fan from power, and then tighten the airfoil hardware
to 29 ft·lb (39.3 N·m). If popping still occurs, verify that the airfoils are
not contacting each other. If they are, contact Customer Service.
Make sure all wires are securely connected and that supply power
is adequate and functional. If the fan still does not start, contact
Customer Service.
• Do not run your fan and sensitive equipment on the same power
line.
• Ensure proper grounding at the motor, at the VFD, and from the
VFD to the utility.
If noise is still present, contact Customer Service.
• Audible high-frequency carrier noise may be an indicator of a stall
condition.
• Some motor, gearbox, or VFD noise is to be expected and is
normal.
• Verify that the mounting structure is rigid enough to support the
fan and that the fan is not being exposed to external air forces.
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