Re: PathPilot on NM200
Have you tried looking at the voltage output without the VFD attached. Is the BoB producing 10V out when you hit max RPM? Is it moving up and down in proportion to the commanded speed?
Ultimately the BoB is doing PWM, but it looks like the interface to you is step and direction with 24Khz steps being 100% output from the PWM. I know my PWM (different BoB) was not anywhere close to linear with the output voltage. Most of the range was used up in the first few hundred commanded RPM so I had to straighten out the nasty curve it was producing. First step was to see what the actual output voltage was doing at various RPM settings. I'd do that here and make sure that you are seeing an output voltage that makes sense. If the BoB is being driven by step/dir frequency then it should be roughly proportional as you increase RPM. If you have a meter with a frequency counter, that could be used to look at what step rate is actually being produced at pin 14 on the DB25 at various RPM settings.
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