14-11-2013, 12:33 PM
Hi Col, you mentioned several posts ago that the 3 phase cable to the motor was screened but not earthed. This should definitely be earthed at the vfd end. If it isnt it will radiate all sorts of harmonics which could well interfere with speed control. I used the screening to carry earth to the motor/lathe although that probably isn't the "approved" method. The little oval below the pot caught me out, of course its screening. But why is it not just connected to the 0v on the pot. ?. I,d definately advise against using anything but a 10K lin pot. The answer is in the setting up somewhere. Peter
