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Author Topic: VFD Speed Control  (Read 8141 times)

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VFD Speed Control
« on: November 22, 2006, 09:36:12 AM »
So i just finished up installing my VFD.  My spindle is a 24000rpm spindle.  The VFD speed control uses a 10v signal to tell it the speed.  But some reason i cant get it to go the right speed that mach tells it. 

If i set mach to max 24krpm and tell it to run 12krpms its is actualy running at 15krpm.  But if i twist the nob on the speed controller going to the VFD so that its running at 12krpm instread of 15k then it runs slower than 24krpms when you tell it 24k.

Id like to get it running within 500rpm of the actualy speed typed in.  Is this possable?

Offline Chaoticone

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Re: VFD Speed Control
« Reply #1 on: November 22, 2006, 09:41:07 AM »
Does your board have an adjustment pot for the 0-10 volt?
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Re: VFD Speed Control
« Reply #2 on: November 22, 2006, 09:48:24 AM »
Yes it does.  even when i use that it only gets a sertain rpm right and then the other are way off still.

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Re: VFD Speed Control
« Reply #3 on: November 22, 2006, 10:19:05 AM »
Have you tried the spindle calibration?
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Re: VFD Speed Control
« Reply #4 on: November 22, 2006, 10:27:56 AM »
No i have not.  Where can i find instruction on how to use it?

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Re: VFD Speed Control
« Reply #5 on: November 22, 2006, 10:47:49 AM »
Look here. I have never used this but I think it will have something here.
http://www.machsupport.com/documentation/M3M1_84-A2.pdf
What version of Mach are you running? In ver. 2.0.12 it is in the function configs. tab.
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Re: VFD Speed Control
« Reply #6 on: November 22, 2006, 11:05:00 AM »
im running whatever is the newest verison.
Re: VFD Speed Control
« Reply #7 on: November 22, 2006, 11:12:38 AM »
I could not find anything about spindle calibration in that pdf.

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Re: VFD Speed Control
« Reply #8 on: November 22, 2006, 11:40:01 AM »
Someone will clear this up for you. I wish I could do more but I think I'm going to have to replace my hard drive now. Did you find it in function Config? I would play with it and try the auto cal.     
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My guard dog is not what you need to worry about!
Re: VFD Speed Control
« Reply #9 on: November 22, 2006, 01:57:52 PM »
I ran the autocal and it didnt change anything.  I dont think the spindle calibration has anything to do with how my spindle works.  I may be wrong but i think its a diffrent setup you would use that for.  My spindle works threw a chargepump that controls a speed control which hooks to my VFD.