Thread: Recommended DAC please?
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11-09-2011 #1
Guys i have been looking franticly for a thread on here that showed a link to an ebay item for allowing speed control of the vfd from Mach3/ EMC2. It was only about £10 does anybody remember it or can recommend one? The VFD in question is 2.2kw chinese job and matching VFD.
Thanks
PaulIf the nagging gets really bad......Get a bigger shed:naughty:
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12-09-2011 #2
I think you can use the PWM output from mach3, possibly with a capacitor/resistor to smooth it. Use the input for the potentiometer on the VFD.
Worth trying before buying anything?
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12-09-2011 #3
Jonathan that is a way i would prefer not to go and would rather use a dedicated DAC for the job. I would stll use pwm control settings in EMC2
If the nagging gets really bad......Get a bigger shed:naughty:
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12-09-2011 #4
There's an option on the VFD to read 3 digital inputs to give 8 different speeds. If you've got enough I/O (i.e. another parallel port) then that could work. Might take a bit of fiddling to get EMC to provide the correct outputs? Not sure...
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12-09-2011 #5
Yes i have the same but would feel better about using ramp control of the spindle. This way i would ever need to remember top and bottom speeds.
If the nagging gets really bad......Get a bigger shed:naughty:
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13-09-2011 #6
Most VFDs I've seen require 0-10VDC on the potentiometer terminals, but check your manual to be sure.
What you need is something like the Spindle V3 from diycnc.
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13-09-2011 #7
This is practically the same as the one i was looking for, the only difference was the price £10 instead of £21 with free p&p. The option for now is o just wire manual controls up and build my own circuit. I've just ordered another Par card so that i can dedicate the pins for external controls etc in a single package. we will see where we go from there.
cheers guys
PaulIf the nagging gets really bad......Get a bigger shed:naughty:
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13-09-2011 #8
I just done a bit searching, and it would appear from a couple references, that the older spindleV2 board was cheaper.
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Is it worth mentioning that a DAC is a simple resistor ladder, ADC's are the tricky blighters :whistling:
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13-09-2011 #10
LOL! normally harder to climb ;-)
If the nagging gets really bad......Get a bigger shed:naughty:
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