116 Maintenance
Replacing roof EC fans*
Procedure
1. Stop, de-energize and ground the drive following the steps in section Shutting down
the drive for maintenance before you start the work.
2. Switch off the motor starter of the fan unit to isolate the fan unit from the auxiliary
power supply. To identify the motor starter, see the ACS580MV Wiring Diagram.
3. Remove the hex-head combination screws that attach the top cover to the fan box. Lift
the top cover and pull it away from the fan box.
4. Disconnect the control and power supply cables of the fan.
5. Remove the fastening screws from the support plate and the duct ring.
6. Using the lifting eyes in the fan housing cover and a lifting gear, lift off the support
plate with the fan attached to it.
Supportbeam
6ͲM6X16
combinationscrew
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