I already checked this. The I.R. values are very good for a 230v motor. Using a 500v megger shows 150 megohms on the stator & 70 megohms on the armature. There is no earth fault or low reading. There are no open circuits in the field or armature coils.
Mike
October 2008
insulation on motor windings will probably be low causing electronics to shut down with e52.you need to test the insulation value to earth with a test meter