30 Rockwell Automation Publication 6000-TG100A-EN-P - September 2020
Chapter 3 Component Inspection and Test Procedures
3. Reinstall the cleaned or new air filter using reverse order of removal.
Verify that the door is fully closed and locked.
Inspect Top Mounted
Cooling Fans
Inspect fans that are used for forced air cooling. Replace any that have bent,
chipped, or missing blades, or if the shaft does not turn freely.
The fans are supplied with 380/460V AC power, which is fed by the low voltage
taps of the Isolation Transformer. The control voltage is 220V. The voltage of
the fan can be measured through a small door on the Isolation Transformer.
Apply power momentarily to check operation.
• A-frame – Fans rotate when medium voltage is applied.
• B-frame – Transformer fans rotate when medium voltage is applied.
Power cell fans do not rotate until you run the drive.
If unit does not operate, check and replace wiring, fuse, or fan motor as
appropriate. Clean or change air filters as recommended in this manual. Verify
that the aviation plug has a proper hand-tight connection. Verify that the
ventilation passages are not blocked and the impellers can rotate freely
without any obstruction.
Replace Top Mounted Cooling Fans
There are two types of top fan housings. The top fan housing consists of a
motor and impeller assembly. To replace the fan, it is necessary to remove the
fan housing lid.
ATTENTION: Exercise caution when measuring the voltage of the fans.
ATTENTION: Fan replacement requires working at a significant height from
the floor. Complete this procedure on a safe, stable platform.
ATTENTION: Always perform Power Lockout procedure before servicing
equipment. Verify with a hot stick or appropriate voltage measuring device
that all circuits are voltage free. Failure to do so may result in severe burns,
injury, or death.
ATTENTION: Medium Voltage must be turned off when replacing the main
cooling fans.
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