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Generic Spindle interfaces, I/O boards, Misc boards and panels / Re: Unpredictable spindle control, PMDX-107, PMDX-126, ess, mach4 Huangyang
« on: November 13, 2019, 02:16:14 PM »
Thanks for the help, you indirectly found the solution to the problem. It turns out there is a spindle control setting in Mach 4 at Configure-ESS-Spindle-PID settings for Kp and its recommended initial (and possibly default) value was 0.00000100. This sets a proportional gain that was creating the issue. This system does not seem to need this correction.
For future reference here is the other information:
AGnd - ACM
Aout - V1
Aref - not connected
Dip switches 4 and 6 are on, others off.
Yes, in effect the spindle speed always creeps up and it increases whether connected to the VFD or not. This output voltage does not increase and is stable when running test mode.
Voltage also increases between 16 and pcgnd.
I did not necessarily choose the 5 volt range but found that the maximum speed setting on this VFD corresponded to ~5V. If I recall correctly, this range was identified early on using the 107 test mode.
For future reference here is the other information:
AGnd - ACM
Aout - V1
Aref - not connected
Dip switches 4 and 6 are on, others off.
Yes, in effect the spindle speed always creeps up and it increases whether connected to the VFD or not. This output voltage does not increase and is stable when running test mode.
Voltage also increases between 16 and pcgnd.
I did not necessarily choose the 5 volt range but found that the maximum speed setting on this VFD corresponded to ~5V. If I recall correctly, this range was identified early on using the 107 test mode.