Hi thanks for your comments. Yes I have the VFD maximum set at 400 hz however at start up I am moving from 0 rev or hz=0 so I expected that the range would be 0 - 24000 or 0Hz - 400Hz what I have found is that with the minimum setting below 3000rev for the spindle speed the spindle simply clicks on and then immediately off. My concern is that at the ALT 1 or 2 screens setting minimum start up revolutions is problematic I must be doing something wrong part of the time though I have no idea what. The only reliable way I have found to set the minimum revolutions per min is to make the min Pulley speed 3000. I actually set it at 6000 but it will work at 3000. I have not read any literature that suggest setting the Pulley speed at any thing other than min = 0 to max 24000. Yes I agree with your comments on earthing.the unit.
I am interested to read your comments on setting the Pulley min.as a solution