Technical data

7.9 Testing Motor Winding Insulation
With the main disconnect switch and compressor motor
starter open, test the motor as follows:
1. Test the insulation, using a megohm meter
(megger), between phases and each phase and
ground as shown; these readings are to be
interpreted using the graph shown in below.
2. If readings fall below shaded area, remove external
leads from motor and repeat test.
Motor is to be megged with the starter at
ambient temperature after 24 hours of idle
standby.
7-8 035L02381-GB0