0-10v Servo Control with 7i76E

Thanks Andy

Sounds ideal, means I can drive the forward/reverse signals separately to the enable, plus it fixes the -10-0-10 signal for 0-10...

Perfect!

I've hooked it up with the PID feeding rbe spinout and it was a bit bizzare, but this should fix it!

Now just have to fix a strange issue with the encoders (now firmware updated and multiple encoders available, none seem to work), so getting broken/non-following joint errors.

Think I'll build a dirt simple UI hooked directly to HAL to test each sub function.

Thanks
Jon

Hi, I bought a 7i76e many years ago. Now I install it in a lathe. But I have a problem. I want the spindle motor to work as a servo motor, but the driver has no input for step direction. The analog output is very slow for a servo pid regulator. Can I add a fast analog output? How can I make an output like 7i77. Has anyone done something like this?

I used a 7i77E, and setup PID on the spindle 0-10V output for this reason. The machine also interlocked two axis and used the same VSD, so with some control logic in place, there are two PID controlling a single output, and take it in turns to position. Not suitable for your application.

Maybe get a daughter card with a servo output in it (not sure what MESA has without looking, but you could always get a 7i77 and run as a daughter off the 7i76E).

Another option is to use the RS-455 interface with a compatible servo controller?

besriworld wrote:

Hi, I bought a 7i76e many years ago. Now I install it in a lathe. But I have a problem. I want the spindle motor to work as a servo motor, but the driver has no input for step direction. The analog output is very slow for a servo pid regulator. 
 

The 7i76 analogue output is a digital potentiometer. It should update instantly every 1mS. 

What makes you think that it is slow? Is it possible that the slowness is in your PID tuning? 

A 7I83 (6 channel +-10V analog out SSerial connected)
is an option (though a bit overkill with 6 channels)

The 7I76E analog output is not terribly fast as it's intended
for normal spindle control and the isolation limits the PWM
frequency and thus filter bandwidth.

is it possible to make a small board that converts frequency into voltage.
My idea is to load 7i76e_7i76x1_7i77x1D firmware and just make a small board to add 1 fast analog output. But I don't know if this is possible and did anyone do it?
It just takes a long time to buy a new card.