RE: [CAD_CAM_EDM_DRO] Digispeed to Variable Frequency Drive probl em

Jeff:

If Peter can't figure it out, I'm not sure if I can ether, but I would like
to see a sketch of your hookup between the PC and the Digispeed, and the
VFD.

Andy Wander
Verrex Corporation

-----Original Message-----
From: washcomp [mailto:jeff@...]
Sent: Thursday, March 10, 2005 2:56 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] Digispeed to Variable Frequency Drive
problem



Peter Homann has been working with me on this problem (he's a
pleasure to deal with and I don't want anyone to take this as a
negative comment), but we're both currently stumpped.

I'm using his Digispeed speed control board to control an Omron
(Yaskawa) G5+ VFD with Mach3.

Supply voltage (from VFD) to Digispeed (through pot) varies from 11.3
at full stop, 11.37-11.52 depending on speed setting (PWM) (I think
it was higher voltage at lower speed), so that's OK.

I have valid PWM output from Mach2 which varies as I adjust spindle
speed.

Digispeed LED behaves properly (double blink at zero spindle speed,
fast blink when PWM is calling for another speed.

There is no voltage out of Digispeed when connected to VFD. If
Digispeed is "primed" by starting tool with control voltage wire
disconnected from VFD and then reconnecting it, Digispeed controls
spindle speed (until spindle is stopped, and then won't control it
without removing wire, starting PWM signal and then re-attaching
wire).