Motor Current Monitor - 3 phases/1 input

[bluenoser337]

Is anyone aware of a device that will measure the amps on 3 motor phases and provide an "average" value on a 4-20mA signal. I have a number of motors to monitor, and I could put a CT on every phase of each motor, but I don't have enough analog PLC inputs. Looking for a device that measures all phases, but only needs a single A/I. A nice addition would be if it also measured imblanace, phase voltages, etc and gave a digital signal for that (good/not good). Not looking for something with serial comms...simply an I/O connected device. Thanks!

 

[James Mcquade]

Try your local electrical contractor for a 3 phase monitoring system. They come in various flavors and models.
about $300 each, but that was several years ago. If they don't know what your asking for, explain to them in detail what you want.

regards,
james

 

[OkiePC]

We use Load Controls UPC, and they are great. They can tell you actual motor power, not just current. We have not had any failures of these devices, so they're very reliable, and very accurate.

I expect they have something for current and with the other features you wanted.
http://www.loadcontrols.com/products/products.html