Unless I'm mistaken, (wouldn't be the first time), the way the
frequency variation manifests itself is by modulating the pulse
width. Pulses shorter and closer together = higher frequency.
Please correct me if I'm wrong.
Jeff
--- In mach1mach2cnc@..., Andy Wander <awander@v...>
wrote:
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@w...]
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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