Maintenance 113Replacing roof AC fans*1. Stop, de-energize and ground the drive following the steps in section Shutting downthe 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 auxiliarypower supply. To identify the motor starter, see the ACS580MV Wiring Diagram.3. Remove the hex-head combination screws (M6x16) that attach the top cover to the fanbox. Lift the top cover and pull it away from the fan box.4. Disconnect the connector and make sure that the supply connector is detached fromthe support beam.5. Remove the four hex-head combination screws (M6x16) that attach the support beamto the side plate of fan box frame.6. Fix the lifting eyes to the support beam. Attach lifting gear, appropriate for the weightof the impeller, to the lifting eyes. Lift off the support beam and the impeller attached toit.NOTICEFor some types of fan boxes two additional hex-head combination screws must beremoved.M6X16combinationscrewSupportbeam4ͲM6X16combinationscrew
