No, it is the same base frequency. The width of the pulse ( length of time
it is high ) determines the energy it can deliver. 80% PWM = 80% of the time
it high and 20% is low.
Jim
toggle quoted message
Show quoted text
----- Original Message -----
From: "washcomp" <jeff@...>
To: <mach1mach2cnc@...>
Sent: Monday, March 01, 2004 11:36 AM
Subject: [mach1mach2cnc] Re: Question on index pulse
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
Yahoo! Groups Sponsor
ADVERTISEMENT
Click HereClick Here
<
M=274551.4550177.5761904.1261774/D=egroupweb
/S=:HM/A=2019528/rand=446470174>
_____
Yahoo! Groups Links
* To visit your group on the web, go to:
<>
* To unsubscribe from this group, send an email to:
mach1mach2cnc-unsubscribe@...
<mailto:mach1mach2cnc-unsubscribe@...?
subject=Unsubscribe>
* Your use of Yahoo! Groups is subject to the Yahoo! Terms
of
<> Service.
Yahoo! Groups Links
