BIG ASS FANS 8’ - 24’ PowerfoilPlus Installation Manual page 75

8' - 24' POWERFOILPLUS™, POWERFOIL™, & WICKERBILL FANS
69
Type 1 Fault Descriptions and Corrective Measures (cont.)
Refer to the following section(s):
Power Requirements (p. 28)
Conduit and Piping Guidelines (p. 32)
Additional Input Power Considerations (p. 63)
The drive will also register a F005 fault if the fan tries to stop too quickly. Unless the drive has lost its programming, this cause of failure
is unlikely. If the drive suffers from a F005 fault at any time other than when the operator has issued a stop command, then deceleration
rates are not an issue. 6' to 14' fans will typically stop in approximately 20 seconds. 16' to 20' fans will typically stop in approximately 25
seconds. 24' fans will stop in approximately 30 seconds. 400~600V controller models may also experience a F005 fault if the motor
leads are shorted or grounded out. If the drive experiences a short on the load side, the output drops off immediately. The
resulting field collapse around the reactor coil can cause a voltage spike on the drives dc buss, which may hide the actual
cause of failure. If this fault occurs on a regular and repeated basis, i.e., within 5 minutes of fan start-up, a technician may bypass the
load reactor temporarily in order to get a legitimate fault code to appear on the VFD.
F006 - Motor Stalled
Drive is unable to accelerate motor. Using a current clamp, monitor the motor(s) current at the moment of start-up. If the measured
value exceeds the motor FLA as listed on the controller's nameplate, the fan should be checked for mechanical binding. This fault will
typically occur if the fan is being restricted from movement. Typically, the fan just will not turn at all before the fault is registered. This
fault can also be caused by a foreign signal present on the controller's output/motor leads.
A F006 fault may also be accompanied by an unstable frequency display on the VFD. This would indicate a corrupted motor feedback,
due to a foreign signal presence.
Refer to the following section(s):
Conduit and Piping Guidelines (p. 32)
Wiring the Motor (pp. 54-55)
F007 - Motor Overload
Internal electronic overload trip. This fault indicates that the motor(s) running current has exceeded a pre-established limit. Possible
causes include incorrect motor wiring, lack of motor ventilation (dirty motor heatsinks), shorted motor windings, mechanical binding or
bearing failure, fan cavitation (check minimum ceiling clearance), incorrect fan gear ratio, controller / fan mismatch, and incorrect cable
type.
ATTENTION: For Multi-fan units, the included overload relays should be set to 115% of the motor's FLA rating. When an
overload relay trips, the controller's run enable circuit is opened. The relay will have to be manually reset before fans can
resume operation.
Electrical Motor Checks:
Using a current clamp, check the current draw on each motor phase. Current readings should not vary more than 10%, and should not
exceed the FLA rating on the controller's name plate. Variations would indicate the possibility of a partially shorted or fatigued motor
winding and/or defective motor leads. Power down the system and wait for the drive's DC buss to discharge. Disconnect the output/
motor leads from controller. Using an ohm meter, check resistance between phases, T1-T2, T2-T3, and T1-T3.
Ohm readings should not vary more than 10-15%. Variations would indicate the possibility of a partially shorted or fatigued winding
and/or defective motor leads.
Refer to the following section(s):
Power Wiring Guidelines (p. 31)
Conduit and Piping Guidelines (p. 32)
Additional Input Power Considerations (p. 63)
F008 - Heatsink Overtemp
Heatsink temperature has exceeded a predefined value. Check the VFD for blocked or dirty heatsink fins. Verify that when the fan(s)
are running, that the VFD's internal cooling fan is operational (fan is located on bottom of drive chassis). Verify that the ambient
temperature has not exceeded 40ºC (104ºF) for single fan units, 50ºC (122ºF) for multi-fan units.
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