Yaskawa Matrix Converter - Manual (Page 359)

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3. Loosen the mounting screws of the fan unit and slide the fan unit to the left.
Note: The fan unit can be removed by just loosening the mounting screws, without removing them.
4. Remove the fan unit and replace the fans with new ones.
For the details of the procedure for replacing the fans, refer to Fan Replacement.
5. To install all of the component parts, reverse the removal procedure.
Mounting screws
Mounting screws
Fan unit