3 Phase motors w/capaitor?
3 Phase motors w/capaitor?
(OP)
I am involved with rebuilding an older European machine and have found what looks to be capacitors across the 3 phase motor legs. I have never seen this before and was wondering if anyone can give me some insight. The motors have a device, Lutze #LRC-M1 across the motor legs, which I think is a capacitor bank. Any input would be greatly appreciated.





RE: 3 Phase motors w/capaitor?
Best to you,
Goober Dave
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RE: 3 Phase motors w/capaitor?
I have never used them and was wondering what their purpose is and if really beneficial.
RE: 3 Phase motors w/capaitor?
What is the rated motor voltage?
RE: 3 Phase motors w/capaitor?
Protection connected between phases would seem to be intended to protect against differential mode transients. I tend to think if the motor is supplied by shielded cables (as common for medium voltage motors), then there is no differential mode path to the motor.
Just curious now (since I've never heard of this). What is the motor hp and supply voltage? Are you supply cables shielded?
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(2B)+(2B)' ?
RE: 3 Phase motors w/capaitor?
Supply voltage is 480VAC.
Motor KW are as follows:
2.3/3.1 KW
0.12 KW
0.75 KW
0.12 KW
RE: 3 Phase motors w/capaitor?
I still see a lot of older specs for large MV machines that call for them, even when being controlled by SS controllers, because a lot of the specs are older and nobody has bothered to update them. GE used to include them if you asked for them or not on their MV motors and sometimes still do, which causes extra work in the field to remove them.
"Will work for (the memory of) salami"
RE: 3 Phase motors w/capaitor?
Your comments have verified my decision to remove them.
Wish cleaning up the wiring numbering was as easy!