VFD 0-10V ???
22 Jan 2021 18:51 #196258
by Jaro
VFD 0-10V ??? was created by Jaro
Good evening.
today I connected to the spindle vfd Danfos (Vacon) any speed control.
I don't know what I'm doing wrong, the inverter is controlled by a 0-10V analog signal. I use AOUT5 (Mesa 7i77) to control it.
in one direction it starts normally and I can also regulate, but in the opposite direction I still have 0 volts at the output of AOUT5.
clear that when I enable the negative value "OUTPUT_MIN_LIMIT" in the .ini file, then I get the required voltage at the output, but the negative value, to which the inverter does not respond. I switch CW and CCW with digital outputs, via relays to vfd inputs "forward" or "reverse". I would need to make a positive voltage at the output of AOUT5, whether I switch CW or CCW.
I'm embarrassed about it all day and I can't handle it anymore.
please, if anyone suggest me some how to solve it ...
I am attaching to the file.
thanks for your willing
Jaro
today I connected to the spindle vfd Danfos (Vacon) any speed control.
I don't know what I'm doing wrong, the inverter is controlled by a 0-10V analog signal. I use AOUT5 (Mesa 7i77) to control it.
in one direction it starts normally and I can also regulate, but in the opposite direction I still have 0 volts at the output of AOUT5.
clear that when I enable the negative value "OUTPUT_MIN_LIMIT" in the .ini file, then I get the required voltage at the output, but the negative value, to which the inverter does not respond. I switch CW and CCW with digital outputs, via relays to vfd inputs "forward" or "reverse". I would need to make a positive voltage at the output of AOUT5, whether I switch CW or CCW.
I'm embarrassed about it all day and I can't handle it anymore.
please, if anyone suggest me some how to solve it ...
I am attaching to the file.
thanks for your willing
Jaro
Attachments:
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- Todd Zuercher
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22 Jan 2021 19:28 #196264
by Todd Zuercher
Replied by Todd Zuercher on topic VFD 0-10V ???
In your hal file change this line:
to this
net spindle-vel-cmd <= motion.spindle-speed-outto this
net spindle-vel-cmd <= motion.spindle-speed-out-absPlease Log in or Create an account to join the conversation.
- tommylight
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22 Jan 2021 21:00 #196276
by tommylight
Replied by tommylight on topic VFD 0-10V ???
VFD = 0-10V
7i77 = +-10V
As you noticed, not the same thing, and driving negative voltage to a positive input is not good, ever.
VFD will require another pin to change direction so using an output from the 7i77 should take care of that, but we would need more info on the VFD or a connection diagram to be able to help further.
In the mean time, set it as Todd advised so the 7i77 does not output negative values, and after finding out how the inputs on the VFD are controlled we cad advise on the connection of the direction pin to the 7i77.
7i77 = +-10V
As you noticed, not the same thing, and driving negative voltage to a positive input is not good, ever.
VFD will require another pin to change direction so using an output from the 7i77 should take care of that, but we would need more info on the VFD or a connection diagram to be able to help further.
In the mean time, set it as Todd advised so the 7i77 does not output negative values, and after finding out how the inputs on the VFD are controlled we cad advise on the connection of the direction pin to the 7i77.
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23 Jan 2021 17:56 #196350
by Jaro
Replied by Jaro on topic VFD 0-10V ???
Hallo Todd.
super easy.
as simple as one knows
100% functional
well thank you
super easy.
as simple as one knows
100% functional
well thank you
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- shortcircuit48
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24 Jan 2021 11:29 - 24 Jan 2021 11:37 #196397
by shortcircuit48
Sorry this all went wrong. I have been following this posting in the hope that I can resolve a similar problem with my 5 axis bob. I can get an analogue output ranging from 0.43 vdc off, to 1.267vdc at 120%. I have bodged about but need direction as to where I can adjust/insert necessary command
Regards
I assume I need to edit with following but stutter to a stop at last line
loadrt scale count=1
addf scale.0 servo-thread
setp scale.0.gain 0.002
net spindle-speed-scale motion.spindle-speed-out => scale.0.in
net spindle-speed-DAC scale.0.out => <your DAC pin name>
Replied by shortcircuit48 on topic VFD 0-10V ???
Sorry this all went wrong. I have been following this posting in the hope that I can resolve a similar problem with my 5 axis bob. I can get an analogue output ranging from 0.43 vdc off, to 1.267vdc at 120%. I have bodged about but need direction as to where I can adjust/insert necessary command
Regards
I assume I need to edit with following but stutter to a stop at last line
loadrt scale count=1
addf scale.0 servo-thread
setp scale.0.gain 0.002
net spindle-speed-scale motion.spindle-speed-out => scale.0.in
net spindle-speed-DAC scale.0.out => <your DAC pin name>
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Last edit: 24 Jan 2021 11:37 by shortcircuit48.
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- shortcircuit48
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25 Jan 2021 09:37 #196513
by shortcircuit48
Replied by shortcircuit48 on topic VFD 0-10V ???
After much trial and error in the HAL file, I gained nothing. Went into the Tools menu in gmoccapy and in Hardware I changed the Spindle settings and now have remote speed control as distinct to manually changing on the VFD.
Result achieved by trial and error.
Result achieved by trial and error.
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