Hi Andy,
Are you actually talking about the signals on the wires to the motor or
about a PWM signal generated by the VFD to indicate the frequency it is
running at?
Mach2 uses the index pulse to determine RPM and is probably based a number
of pulses per interrupt cycle. It may be based on the speeds you define in
the pulley setup of the spindle. You would have to ask ART specifically.
Best,
Ed Gilbert
Gilbert Engineered Systems
632 Warrenton-Embro Road
Macon, NC 27551
252-257-0539
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-----Original Message-----
From: Andy Wander [mailto:awander@...]
Sent: Monday, March 01, 2004 12:05 PM
To: 'mach1mach2cnc@...'
Subject: RE: [mach1mach2cnc] Question on index pulse
Of course, VFD means Variable Frequency, so is this actually a PWM signal?
I'm so confused...
Andy Wander
Verrex Corporation
-----Original Message-----
From: washcomp [mailto:jeff@...]
Sent: Monday, March 01, 2004 8:42 AM
To: mach1mach2cnc@...
Subject: [mach1mach2cnc] Question on index pulse
I notice that "index pulse" can be checked on the parallel input to
pick up the true speed of a machine. Can the PWM frequency of a VFD
be used for this? If so, can it be scaled in MACH2 to correspnd to
the speed (I believe speed is a linear function to frequency, but the
numeric value of one will not be the same as the other.
Jeff
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