mpparent
Electrical
- Sep 26, 2001
- 399
All,
I have a motor (of which I do not have a nameplate to verify HP rating), which belongs to a process. The process owner wants to purchase a new motor, but with no nameplate, we are unsure of what to purchase (a new motor was purchased at one point and it turned out to be wrong). The motor is driven by an old VFD (not supported), and I have a PQ meter on both the line and load sides of the VFD. I'm not really a VFD expert, but I keep reading that circuit monitors can become confused by taking readings on the output of the drive (because of switching). A colleague said we should monitor the load side, however, since the input into the drive is the real work done by the motor, I would think monitoring the line would be enough to figure out the actual motor HP requirements. Would love to get some feedback.
Thanks,
Mike
Mike
I have a motor (of which I do not have a nameplate to verify HP rating), which belongs to a process. The process owner wants to purchase a new motor, but with no nameplate, we are unsure of what to purchase (a new motor was purchased at one point and it turned out to be wrong). The motor is driven by an old VFD (not supported), and I have a PQ meter on both the line and load sides of the VFD. I'm not really a VFD expert, but I keep reading that circuit monitors can become confused by taking readings on the output of the drive (because of switching). A colleague said we should monitor the load side, however, since the input into the drive is the real work done by the motor, I would think monitoring the line would be enough to figure out the actual motor HP requirements. Would love to get some feedback.
Thanks,
Mike
Mike