If installed in an appropriate environment, the drive requires very little maintenance. This table lists the routine maintenance intervals recommended by Daikin.
The heatsink fins accumulate dust from the cooling air. Since a dusty heatsink is less efficient at cooling the drive, overtemperature faults become more likely. In a “normal” environment (not dusty, not clean) check the heatsink annually, in a dusty environment check more often.
Clean the heatsink as follows (when necessary):
NOTE: If there is a risk of the dust entering adjoining equipment, perform the cleaning in another room.
Source: Daikin (oslo.daikinapplied.com)