Encoder velocity to analogue +/- 10v

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13 May 2020 04:58 #167606 by johnmc1
Good day All

I have started to fit Linuxcnc to a Matsuura mill, the mill had a fanuc 6m controller originally fitted.
The existing axis servo drive require the motor velocity feedback,
as there is no tachogenerator fitted to the axis motors.
This velocity feedback for the drive, was generated in the fanuc controller which is derived from the axis motor 2500 pulse encoder.
Any suggestions, as to how I may be able to source a encoder pulse velocity to analogue +/- 10v conversion, to operate the existing
servo drives.
Many Thanks.
cheers john

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13 May 2020 06:56 #167612 by tommylight
That should be quite easy by connecting the encoder velocity to another analog out.
But if the original mototr had a tacho, those do produce way more than +-10V, usually around 15V for 1KRPM so at 3000RPM that make 45V on the tacho input. That can most probably be adjusted on the drive, but i doubt it will go that low.

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22 May 2020 12:40 #168576 by johnmc1
Thanks Tom for your reply your message switched the light on.

After much reading I find that the axis amplifiers,
require a motor feed back of +- 6 volts per 1000 RPM, max speed 1500 RPM
The motor has 2500 line encoders.

I plan to use Motion card 5i24/16 >> --- 7i48 , 6 channel analogue servo
I
I---- 7i44, remote smart serial BOB
I
7i83, 6 analogue output
I
7i71 output sourcing
I
7i70 input

If the above choice is compatible , I have most of the Mesa cards.
Any suggestions on the above choice, will be much appreciated.

Cheers and many thanks john

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