AC ammeter for measuring VDF output current 4

[abbas2005]

Hi everybody;

There are several 400V, 3Ph, induction motors equipped with Variable Speed Drive (VFD) mounted in LV MCC room. The output frequency in normal operation of the motors will be about 20Hz~50Hz. I want to buy/finalize Ammeter to be mounted in Local Control Station (LCS) of the motors. As the ammeter will measure the output current of the VFD's, I need to have good accuracy in 20Hz~50Hz frequency range. Could you possibly explain how can i achieve this.

Thanks

 

[itsmoked]

That sounds like a pretty good way forward. Good luck.

Keith Cress
kcress -

http://www.flaminsystems.com

 

[GroovyGuy]

Hi abbas,
Why not use the analog output in the drive to drive a remote ammeter? I assume that your drive does have a spare A/O channel, or two, on it. Most modern drives have several A/O channels that can be programmed to provide a whole bunch of data (ie speed, current, power, voltage etc.
I don't understand why anyone would bother with a CT for this application?

"I have not failed. I've just found 10,000 ways that won't work." Thomas Alva Edison (1847-1931)