rovineye
Electrical
- Oct 10, 2006
- 203
This is a sipboard installation. 480 V 3 phase ungrounded sub station feeding an elevator with a two speed two winding motor. When the motor is running I get ground indications on ground detector lights at the sub station, and they change the ground indication from phase to phase to phase. Sort of a slow stobe effect so to speak. This happens in both speeds. In fact I have 4 elevators that do this (out of eight). All are new.
IR and PI are normal.
IR and PI are normal.