Nidec DFS Series Power Installation Manual

28 DFS1/DFS2 Power Installation GuideIssue Number: 23.6 Routine maintenanceThe cubicle should be installed in a cool, clean, well ventilated location. Contact of moisture and dustwith the drive should be prevented.Regular checks of the following should be carried out to ensure drive / installation reliability aremaximized:3.7 Cooling fan replacementRefer to the drive module Power Installation guides for details of how to replace the drive modulecooling fans in the event of failure.Stored chargeThe drive contains capacitors that remain charged to a potentially lethal voltage after theAC supply has been disconnected. If the drive has been energized, the AC supply mustbe isolated at least ten minutes before work may continue.Normally, the capacitors are discharged by an internal resistor. Under certain, unusualfault conditions, it is possible that the capacitors may fail to discharge, or be preventedfrom being discharged by a voltage applied to the output terminals. If the drive has failedin a manner that causes the display to go blank immediately, it is possible the capacitorswill not be discharged. In this case, consult Nidec Industrial Automation or their authorizeddistributor.EnvironmentAmbient temperature Ensure the enclosure temperature remains at or below maximum specified.DustCheck that the drive module heatsinks and cooling fans are not gathering dust.This includes the roof fans and the filters in the door. The lifetime of the lfan is reducedin dusty environments.Moisture Ensure the cubicle shows no signs of condensation.EnclosureEnclosure door filters Ensure filters are not blocked and that air is free to flow.ElectricalScrew connections Ensure all screw terminals remain tight.Crimp terminals Ensure all crimp terminals remains tight – check for any discoloration which couldindicate overheating.Cables Check all cables for signs of damage.WARNING