MaintenanceCopyright © 2007-2010 Eaton Corporation. All Rights Reserved.IPN 997-00012-62E June 2010 51Problem Possible Cause Required ActionI/O board Power/CommsOK LED is offI/O board is not powered orfaulty.Check connection to YH3 on I/O board.See Connections on page 69.Replace I/O board if faulty.I/O board Power/CommsOK LED is flashing.I/O board is responding to anIdentify command from theSC200 or SC100.None, this is normal operation. Seedetails in the System ControllerOperation Handbook.Replacing or Adding a RectifierRectifiers can be replaced without switching off the dc power system and disconnecting theequipment it powers.I• To reduce the risk of electric shock and maintain optimum system cooling, always coverempty rectifier slots with blanking panels.• To avoid electric shock do not place hands inside the rectifier shelf.• Do not attempt to disassemble faulty rectifiers. Return them (in their original packaging)with a completed Equipment Incident Report on page 77.Removing a RectifierStep 1 - Undo the rectifier retaining screwThis will release the rectifier from its rear connector.Step 2 - Pull out the rectifier• The rectifier may be hot, especially after prolonged operation. Use suitablegloves.• To avoid damage do not rest the rectifier on its connector.Step 3 - Replace rectifier or fit blank panelInsert a replacement rectifier into the empty slot (see details in following section), orfit a blank panel.Procedure complete
