-----Original Message-----
From: mach1mach2cnc@... [mailto:mach1mach2cnc@...]
Sent: Tuesday, March 10, 2015 1:59 PM
To: mach1mach2cnc@...
Subject: Re: [mach1mach2cnc] VFD and PWM and G540
Hi,
No, the G540 pins 7 and 9 do not output a 12V supply on their own.
The G540 generates an isolated control voltage on pin 8. The amplitude of
the voltage is voltage is a percentage of the voltage that is supplied to
pins 7,8 of the G540. The percentage is derived from the Mark/space ratio of
the PWM signal from Mach3 that is present of pin 14 of the G540's DB25
connector.
So, if the duty cycle (mark/space) ratio is 25%, then the voltage output on
pin 8 of the terminal block will be 25% of the voltage you supply across
pins 7,9. In this example, if you supply pins 7 and 9 with 10V, the G540
will generate 2.5V on pin 8.
If you supply pins 7 and 9 with 12V, the G450 will generates 3V on pin 8
when
Mach3 outputs a PWM with a duty cycle of 25%
Note, the recommended max voltage supply across pins 7,9 is 12Vdc.
Cheers,
Peter
On 11/03/2015 3:48 AM, Chris microcnc_31@... [mach1mach2cnc] wrote:
Hello:
Can anyone tell me how the PWM signal comes out of Mach?. And if you
have made connection correctly from G540?. Pin 7,8 and 9 are connected
to VFD, Does pin
7 and 9 put out 12V on their own?
Thanks
Chris
