My 7i76 wiring plan for JMC iHSV57 servos and peripherals

 

So this is my wiring plan for a dual independent X-Axis CNC using JMC HSV57 servos, as well as the wiring for the YL620-A VFD.

Anything obvious that I forgot? Did I forget any must-have peripherals/inputs?

(Not pictured: 42V servo power is wired separately.)

Without looking at the drive manuals (which I don't really have time to do) it isn't easy to say whether what you have is correct.

Be aware that unless TB1 has field power connected then the smart-serial subsystem will be unpowered and you will not see your GPIO.

if the polarities are all correct then worst case is that it won't work and you can ask us specific questions.

Thank you! Of course, checking every pin would be too much work, I was more worried about whether I have taken all the right pins into consideration or forgot any major parts. More specifically:

- Since the X axis uses dual independent motors (and end switches), do I need to wire the PED+ and - from the servo driver? Or do I have to take anything else into consideration?
- In addition to E-Stop, Door sensor, and Probe inputs, did I forget any must-have peripherals?
- Is it ok to use a relais to turn on/off servo power, or could that lead to problems?
- ...?

In other words, I am more worried about the general completeness of my plan, rather than the individual pinout.

Never have any relay between the servo drive / VFD / stepper driver and the motor. Other than that it is probably fine to turn on/off servo drives with a relay. It's easier to switch on the AC side, rather than breaking the DC supply (depending on the servo drive they may take AC input, or DC input from a separate PSU)
If you need to break DC then make sure the relays are rated for it.

I don't see PED+ and - on the pinout diagram. What are they? 
 

Ok, I made sure not to switch DC anywhere using a relay.

PED+ and - are on the servo drivers. I think they are meant to signal back to the controller when the servo has reached a specific position. So far I have not connected them anywhere though, which is why they don't show in the plan. But I am not sure if they are required for synchronizing both X axis servos.

You probably want to take limit switches to LinuxCNC rather than to the drives. The drives don't need to know.

My understanding of PED is different, I think it is supposed to signal when all motion instructions that were sent to the driver have been successfully executed. It doesn't signal absolute positions like limit switches would.

So it could be used to synchronize multiple motors. But I am not sure that my understanding is correct.