Yasnac i80m PWm to +-10VDC convertor
24 Aug 2024 15:31 #308540
by dextaca
Yasnac i80m PWm to +-10VDC convertor was created by dextaca
Good day
Wasn't sure there to post this thread, since is a bit off the Linuxcnc topic but was hoping to get some pointers at least.
problem is related to the current drive protocol that is used in the old Yaskawa cacr-ir series servopacks. it uses Rs-422 protocol with 48khz PWM modulation on the u / V phase to drive the servos. These Servopacks are becoming harder and harder to repair and to buy , prices are sky high.
Will be tapping into the wires shortly to see if I can get some readings from them , wondering if any one on this forum offers Raspery pi or similar programming / development services? Hoping to make a simple dual chanel PWM to 0-10VDC convertor. so I can use regular 0-10VDC command on more modern servopacks.
For more details see:
s3.amazonaws.com/Icarus/DOCUMENTS/Yaskawa_Manuals_48.pdf
Thank you kindly to all..
Wasn't sure there to post this thread, since is a bit off the Linuxcnc topic but was hoping to get some pointers at least.
problem is related to the current drive protocol that is used in the old Yaskawa cacr-ir series servopacks. it uses Rs-422 protocol with 48khz PWM modulation on the u / V phase to drive the servos. These Servopacks are becoming harder and harder to repair and to buy , prices are sky high.
Will be tapping into the wires shortly to see if I can get some readings from them , wondering if any one on this forum offers Raspery pi or similar programming / development services? Hoping to make a simple dual chanel PWM to 0-10VDC convertor. so I can use regular 0-10VDC command on more modern servopacks.
For more details see:
s3.amazonaws.com/Icarus/DOCUMENTS/Yaskawa_Manuals_48.pdf
Thank you kindly to all..
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24 Aug 2024 16:21 #308542
by tommylight
Replied by tommylight on topic Yasnac i80m PWm to +-10VDC convertor
What will be producing the PWM signal?
You can easily make a crude PWM to analog converter with a resistor and capacitor that will be good enough for testing stuff, but for 0-10V it would also need a transistor and another resistor and a 12V power from somewhere.
And just to be clear, modern and old servo drives use +-10V, not 0-10V, so that is another can of worms altogether.
VFD use 0-10V, most new-ish ones can also be programed to use 0-5V so no need for any conversion.
You can easily make a crude PWM to analog converter with a resistor and capacitor that will be good enough for testing stuff, but for 0-10V it would also need a transistor and another resistor and a 12V power from somewhere.
And just to be clear, modern and old servo drives use +-10V, not 0-10V, so that is another can of worms altogether.
VFD use 0-10V, most new-ish ones can also be programed to use 0-5V so no need for any conversion.
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24 Aug 2024 19:07 #308549
by dextaca
Replied by dextaca on topic Yasnac i80m PWm to +-10VDC convertor
yes it needs to be +-10VDC , a typo.. the pwm comes from the i80 yasnac controller..
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