Shaft Grounding
Shaft Grounding
(OP)
We just installed a VFD Yaskawa AC Drive-A100 on a wire drawing machine
I´ve read that we need to ground the shaft to avoide damage to the bearings cause by leaking currents through them
My question is: Isnt the shaft already grounded through the gear train? The shaft has a steel gear directly couple to it and the machine structure is already grounded
I´ve read that we need to ground the shaft to avoide damage to the bearings cause by leaking currents through them
My question is: Isnt the shaft already grounded through the gear train? The shaft has a steel gear directly couple to it and the machine structure is already grounded





RE: Shaft Grounding
Mike Halloran
Pembroke Pines, FL, USA
RE: Shaft Grounding
There is no cure-all for this. You have to find out if the situation is bad or not and then what the dominant coupling mechanism is. After that, you can decide if you need to do anything about it and also what to do.
Gunnar Englund
www.gke.org
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Half full - Half empty? I don't mind. It's what in it that counts.
RE: Shaft Grounding
Use a proper motor with insulated bearing or install a brush for shaft earthing. The VFD applications requieres an Inverter duty motor usually this kind of motor are prepared for it and some one have an insulated bearing in N.D.E, could be good you consult with your motor dealer.
Regards
Carlos
RE: Shaft Grounding
Skogs: Are you saying that grounding the shaft it is not always necessary and it depends on case study? Sorry my english is not very good
RE: Shaft Grounding
Gunnar Englund
www.gke.org
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Half full - Half empty? I don't mind. It's what in it that counts.