rejoe.koshy
Member
Hi guys,
I am facing weird issue of my VFD tripping on ground fault.I have a Sinamics drive & a siemens servo-motor installed.A couple of days back the drive started tripping of ground fault repeatedly .I checked the cable & motor for existing fault conditions but couldnt find any.Hence I conclude that the drive might at fault & replaced it by a new one.To my dismay, the fault reappeared.
I really at a loss as whats going on.I have checked the 3 phases of the motor to find equal resistances on all three phases with good values for phase to ground values on the megger.The cable was also subjected to megger test but seemed fine.
What else could trigger a fault like this?
Pls help
Note; The fault appears as soon as I issue the servo-on command.
I am facing weird issue of my VFD tripping on ground fault.I have a Sinamics drive & a siemens servo-motor installed.A couple of days back the drive started tripping of ground fault repeatedly .I checked the cable & motor for existing fault conditions but couldnt find any.Hence I conclude that the drive might at fault & replaced it by a new one.To my dismay, the fault reappeared.
I really at a loss as whats going on.I have checked the 3 phases of the motor to find equal resistances on all three phases with good values for phase to ground values on the megger.The cable was also subjected to megger test but seemed fine.
What else could trigger a fault like this?
Pls help
Note; The fault appears as soon as I issue the servo-on command.