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vsd
09-07-2012 03:00 AM

Variable speed drive interference

I have a variable speed drive, the values of the PLC thermostat are all zeros as long as the VSD drive operation, and if the ac drive stops running, the data return to normal immediately (I remove the output lines of the variable speed drive, it runs to 50HZ and the data is normal). Do not know how to deal with it.

I've tried several ways which all were not useful, like ground, separate the VSD drive and control lines, put steel pipes to the speed drives output lines, nothing working, now I'm intending to add the filter, still do not know if there is effect or not, it's a 7.5kw speed drive, I bought a 23A filter. anyone knows how to handle it?