How do I connect UMI 7772 with ECMD 275 amplifier (from EC Motion)

Question

Hi,
I have connected the UMI 7772 to the ECMD 275 amplifier from EC Motion to operate a stepper motor, but it`s not working. I connected the analog output signal from the control connector of the UMI 7772 to the Puls+ of the ECMD 275 and according to this the analog output ground to the Puls-. Furthermore I connected the Step (CW) of the UMI to the Direction+ of the ECMD and Dir (CCW) to Dir-, Fault + of the UMI to Ready+ of the ECMD and Fault- to Ready-.
Does anybody know if I can connect the ECMD to an analog output signal? Or does anybody have an idea what the mistake is?
Thanks to everybody!
Steffi

Answer 1

> At Axis Status there are the following LEDs red: Limit Switch is active and Home Switch is active. Does that matter???
Yes, it DOES matter. If the motion controller thinks that one of the limit switch is active, it does not perform any motion towards that (sometimes imaginary) limit switch. If it thinks that BOTH limit switches are active, consequently it does NOT perform ANY motion.
> Can we change that?
Yes. You can set the polarity of the limit switches to the opposite value, or disable them completely (if you do not plan to use any limit switches, in a rotary motion system, for example, this usually is not necessary).
In general, as mentioned above, NONE of the limit switch indicators should light up if you did not connect any switches. Obviously LabView has an initialization setting for the limit switches which is different from that in MAX.
You don't have to care about the HOME switch indicator too much. You can change the polarity or disable it, too, if you do not use any reference position in your motion system. (It is strictly recommended to use a reference position and a sensor on that position for practical use in case the system gets out of sync - there is no way the motion controller can check actual position of your system if there is no feedback via a HOME switch or a - rotary or linear - encoder.)