PWM Settings

[john swift]

I expect the G540 PWM circuit was designed replace the 5K potentiometer speed control for the original speed control boards as used in the machines like my old machine mart CL300M lathe

see this post
http://www.model-engineer.co.uk/foru...s.asp?th=38809

John

PS

the G540's PWM circuit was posted in a reply by Geckodrive
(Marcus Freimanis I think )

[Ger21]

As I told you on the Mach3 forum, you have Mach3 and the G540 working correctly.
The problem is that your VFD is giving you the wrong frequency.
2.42Volts on the analog input should be roughly 100Hz (96.8).

[Gunar]

....The problem is that your VFD is giving you the wrong frequency.
2.42Volts on the analog input should be roughly 100Hz (96.8).

Just to clarify the 2.42v is from the G540 terminals T7/T8 (ACM or ground & Vout). The VFD sends to G540 throught terminal +10V and ACM 9.88v

[Ger21]

Right, but the 2.42V goes back to the VFD, correct? The VFD uses that to set the frequency, and should be setting it at 96Hz.

[Gunar]

Correct. BTW Gerry I was told on Mach3 there is the "Calibrate Spindle" on the Functions Config menu. Is this any good for me to calibrate my spindle?

[Ger21]

You need an encoder on the spindle to calibrate it.

What kind of VFD do you have? You may be able to adjust the frequency to the voltage so that you get the correct RPM.

[Gunar]

My VFD is a Chinese model HY01DS11B as per attached pictures (3PH 110Vac, 50Hz, 1.5KW, 13A, 0.50-400.00Hz). So you are saying the Calibrate Spindle on Mach3 will do nothing for me?