Electrical installation52Checking the insulation of the assemblyDriveEvery drive has been tested for insulation between the main circuit and the chassis(2500 V rms 50 Hz for 1 second) at the factory. Therefore, do not make any voltagetolerance or insulation resistance tests (e.g. hi-pot or megger) on any part of thedrive.Input cableCheck the insulation of the input cable according to local regulations beforeconnecting it to the drive.Motor and motor cableCheck the insulation of the motor and motor cable as follows:1. Check that the motor cable is disconnected from the drive output terminals U2,V2 and W2.2. Measure the insulation resistances of the motor cable and the motor betweeneach phase and the Protective Earth by using a measuring voltage of 1 kV DC.The insulation resistance must be higher than 1 Mohm.IT (ungrounded) systemsDisconnect the EMC filter capacitors of selections +E202 and +E200 beforeconnecting the drive to an ungrounded system. For detailed instructions on how todo this, please contact your local ABB distributor.WARNING! If a drive with EMC filter selection +E202 or +E200 is installed on an ITsystem [an ungrounded power system or a high resistance-grounded (over 30 ohms)power system], the system will be connected to earth potential through the EMCfilter capacitors of the drive. This may cause danger or damage the unit.PEohmM
