vfd 0-10v working improperly on 7i76

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07 Sep 2021 23:55 #219898 by JJ48_24
The 01-10v analog vfd control is not working on my 7i76. In PncConf rpm is set correctly at 24k along with voltage at 10v. From 0-8000 rpm everything works fine. All voltage of pot is 3.3, and VFD is at 133 hz, however at 12000rpm in linux cnc the vfd only hits 165 hz, and when set to 24000 vfd is only at 200hz, and voltage across 1, and 2 on pot is 5v. The vfd works fine with the integral pot on the VFD, and the voltage reads 5v from the board, so I don't think it is a vfd issue. Any ideas?






 

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08 Sep 2021 02:53 #219904 by PCW
Sounds like the input is set for 10V full scale if 3.3V gives 8000 RPM (133 Hz)

Is the voltage across TB4 pins 1 to 3 always 10V regardless of spindle speed setting?

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08 Sep 2021 14:20 #219951 by JJ48_24

Sounds like the input is set for 10V full scale if 3.3V gives 8000 RPM (133 Hz)

Is the voltage across TB4 pins 1 to 3 always 10V regardless of spindle speed setting?

Yes

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08 Sep 2021 14:48 - 08 Sep 2021 14:49 #219956 by PCW
So what is the output voltage from TB4 pin2 when the spindle speed is set to 24000
RPM?

Also could you post your hal/ini files?
Last edit: 08 Sep 2021 14:49 by PCW.

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09 Sep 2021 02:01 #220027 by JJ48_24
The voltage on tb4 when rpm is set to 24000 is 5v.

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09 Sep 2021 02:34 #220030 by PCW
Can you post your hal and ini files?

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09 Sep 2021 02:41 #220031 by JJ48_24
not at my shop rn, but next time I am over there I will send them over

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30 Sep 2021 20:33 #221911 by andypugh
It's been a while, did you sort this out?

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