TB Wood's WFC1000 Series, Installation, Operation And Maintenance Instructions

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PROBLEM CHECK POINT CORRECTIVE ACTION
Incorrect wiring
External frequency
command (if used)
Programming selections
Fault
Motor stall
Loose terminal connection
Frequency control pot
erratic
Frequency profile
Frequency control signal
Motor nameplate
specifications
Keypad connections
intermittent
Logic supply overload
56
7.3 Maintenance and Inspection
The WFC HT AC Inverter is essentially maintenance-free and should provide years of trouble-free operation if
proper installation and operation procedures are observed. Chassis type controls are designed to be operated
in relatively clean and low humidity areas. If dust accumulates on the internal printed circuit boards and
components, remove power and clean with low pressure air or vacuum. Remove any dust or lint that
accumulates on the outside of the enclosure, the fan, the fan grille, and the heat sink fins to maintain the
excellent cooling properties of your WFC
HT
Inverter. NEMA 4 models are by design compatible with being
washed down by water. After this has been done, it is suggested that the drive be operated for several minutes
to expel any water trapped within the fan motor.
1. Check all power and control wiring.
1. Verify that the external frequency control signal is properly
connected.
2. Verify the integrity of the frequency control potentiometer (if
used).
1. Verify that the proper programming selections have been
made for the application.
1. Verify that the inverter has not shut down due to a fault
condition.
2. Consult Table 8.2.
1. Release any overload on the motor.
2. Verify that adequate torque boost is available.
1. Stop the inverter, turn off power, and tighten all terminal
screws.
2. Check for tightness of all connections within the drive.
1. Replace frequency control potentiometer.
1. Verify that the setting of 53-FKNEE and 32-FMAX are
correct for the motor specification and application.
1. Verify the input signal level.
1. Verify that the motor selection is proper for the application.
1. Verify keypad connections to control board.
1. Check for excessive load on te24.
2. Remove power for 10-15 minutes; then reapply.
Motor is not
running
Motor Speed
Fluctuation
Motor Speed
Too High or
Too Low
Display Blank
TABLE 7.3
F18 Running Overcurrent
F19 Heat Sink Overtemperature
F20 Timed Overload
7.2 Troubleshooting (continued)
FAULT
NUMBER
CAUSE REMEDY
1. Locate the cause of a mechanical overload on the motor.
1. Check for excessive load on the motor.
2. Verify the proper sizing of the WFC
HT
for the application.
3. Locate the WFC HT in a cooler location, out of direct sunlight.
1. Check for WFC HT sizing for the application.
2. Reduce the loading on the motor.
3. Check for DB component or output transistor failure.
4. Check for shorted DC bus.
5. Check setting of 67-TOL.
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