VFD - Motor Distance
VFD - Motor Distance
(OP)
Hi, everybody,
Can you tell me What is the longest distance between a VFD and the motor controlled?. Voltage atenuation appart, what anything else could be happen?
Can you tell me What is the longest distance between a VFD and the motor controlled?. Voltage atenuation appart, what anything else could be happen?





RE: VFD - Motor Distance
The exact distance will vary depending on the drive, carrier frequency, etc. The drive supplier can give you some maximum length guidelines.
A filter on the drive output will attenuate the higher frequency components and reduce this effect.
RE: VFD - Motor Distance
Best regards,
Mark Empson
http://www.lmphotonics.com
RE: VFD - Motor Distance
RF emmissions from the cables can get really nasty if not properly shielded. This happens at any legnth, but gets exponentially worse with cable length. If it's in metal (ferrous) conduit don't worry about it, but PVC conduit or direct burial unshielded cables can be a headache (I know from experience).
Eng-Tips: Help for your job, not for your homework Read FAQ731-376
RE: VFD - Motor Distance
A sine filter is not cheap or small but I've used them on motor leads of 850 feet without any problems.
RE: VFD - Motor Distance