Machsupport Forum

Mach Discussion => Mach4 General Discussion => Topic started by: Ken Make Tech on December 11, 2020, 10:18:59 AM

Title: ESS PWM spindle open loop
Post by: Ken Make Tech on December 11, 2020, 10:18:59 AM

Hi all. On mach4 with the ESS, I am driving the VFD with PWM signal but it ramps up too slowly. Changing the settings has no effect on the PID.
Any help much appreciated.
Cheers
-Ken
https://www.youtube.com/watch?v=A0Pth6P23oM

Title: Re: ESS PWM spindle open loop
Post by: Ken Make Tech on December 11, 2020, 11:39:42 AM

Over on the Warp9 forum, Andrew tells me I should try a newer version of the plugin -> 259.
So I will give that a go.

Title: Re: ESS PWM spindle open loop
Post by: Ken Make Tech on December 12, 2020, 04:15:25 AM

SOLVED!
I'm using these BOB from steppers online. It has a built in low pass filter that was the cause of this slow up ramp. I have now used a normal 5v output pin and added my own low pass filter. I've setup the VFD analogue input to 5v and its working perfectly.

The new version of the plug in triggered a compatibility warning and based on the above info it obviously didn't fix my issue, so I've rolled it back.