[rwskinner]

I have Mach 3 running a G540 driver and also using it to control my VFD. I have something real weird happening, the Output from the G540's VFD Out is nice and stable until 61% duty cycle. From 61% to 69% the voltage is real erratic and the VFD jumps all over the place. As soon as the duty cycle hits 70% everything smooths out fine.

Example: Mach says it's outputing 63%, the VFD is jumping back and forth from 56% to 66% really fast. Any other Duty Cycle range beside the 60's is perfect.

I thought it was the base frequency that needed to be raised or lowered but it has not made a difference. I have mine set at 50hz currently.

Any clues or ideas?

Richard

[spidey4fun]

Hi Richard,

I've a G540 and Chinese Spindle.

Sorry cant help as Im not at this stage yet. Im still just trying to turn the darn thing on. Any chance you can post some of your setting? I've just followed this tutorial.. but no luck!!..can you see what missing from this one?


http://seafurymike.dyndns.org:2001//...=hf-spindles-2

Brad.