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Does the VFD have Auto-tuning? There is usually a parameter for accel & decel rate.
If you shorten the decel too much you can run into a overvoltage situation which may require a braking resistor.
Al.
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I am using a VFD to control my spindle. Using a 10V analog output board, and step/dir setup only (no PWM) in Mach.
I am struggling to get the acceleration of the spindle to a reasonable rate. Takes 5-6 seconds to wind up to 2000 rpm.
Any ideas here on setups? I have tried all kinds of different motor tuning parameters, and can't seem to make any progress.
Thanks
Scott
Does the VFD have Auto-tuning? There is usually a parameter for accel & decel rate.
If you shorten the decel too much you can run into a overvoltage situation which may require a braking resistor.
Al.
CNC, Mechatronics Integration and Custom Machine Design (Skype Avail).
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.
How many horsepower is your motor?
How stiff is the spindle to turn, ie., does it spin up easily by finger and coast for 10 seconds, or does it take a wrench to turn it?
First you get good, then you get fast. Then grouchiness sets in.
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
The VFD is a KB 2hp. I have it set for external control by the 10VDC signal. When I run it off the VFD keypad - all is good. I can set it for 2.5s accel/decel and it runs right up nice.
After lunch here I will put the scope on the spindle step signal and see how quickly it is reacting to a spindle speed change. I have a strong feeling it is something I am setting up wrong in Mach motor tuning or something. Its either Mach or the spindle speed board - since when I look at the 10VDC analog out of the spindle speed board it also comes up to 10V very very slowly.
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