Stepper Motor Control

[Matt Burden]

I'm working on controlling a stepper motor through flexmotion. Currently,
the step output is not strong enough to register with the stepper driver.
So we're using an amplifier. Is there any way to increase the output from
the Motion Control Card? Also, on a UMI-7764, how can I send a TTL signal
to an unused axis?

Thanks!

Matt

[Rich Celestre]

I had the same problem while connecting a Compumotor ZETA stepper drive to a UMI-7764 connected to a 7344 controller. The ZETA drive was loading down the output of the step and direction signal to the point that there was not enough current to drive the ZETA's inputs. This problem was solved by placing a DS9638CN (RS-422 Dual High Speed Differential Line Driver) between the UMI outputs and the ZETA inputs. I mounted the IC on a small board which I placed inside of the UMI-7764 box so that I was able to use the +5 vdc terminals to power the circuit.
You will need one chip for each axis. (Step and direction both needed boosting) Be sure to connect to the non-inverting terminals of the 9638.

[choijs]

Hi Rich,

Is your problem also applicalbe to my case that UMI-7764 drops its output pulse voltage level down to +13Volts of CCW and CW even though stepper motor amplifier supplies +24Volts,10mA?

Thanks in advance.

Choe