Originally Posted by
lcvette
He isn't complaining about noise, he has blown components.. as per the title of the thread, he is looking for possible conditions that could cause this. This is one of those conditions so I think it's relative to the topic at hand. Now I don't "build vfd's" but I have read more than any one probably needs to in order to learn and understand this area. You are confusing what creates the need for the line reactor and that is the pwm switching frequency and not the motor voltage frequency. If nothing operated above the frequency of a traditional 3 phase motor at twice the frequency output there wouldn't be noise problems. You don't have to dig far too find that power companies require line reactors to be compliant. If they have concerns of damaging their transformers, don't you think there is a risk of damaging a servo drive connected to the same line set? Again I don't build them, but about every recommendation for power wiring a VFD that I have seen (by a company)shows a line reactor. Most technical documents also show the use of a line side line reactor from numerous articles available with a quick Google search.. I'm not making this up but you seem to think I am. Not sure why, especially if you engineer and build them. It's just good safe smart sense to run a line side line reactor.
To the OP, obviously it's your machine, but I would recommend you take 5 minutes and Google line reactor for VFD. Perhaps you will find some information that explains why you should be running one especially on a computer controlled or PLC operated system running off the same supply lines as your VFD, It goes beyond simple annoying noise.
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