You haven't really said if this is for a specific application or just for academic interest, if the former, then the mechanism criteria would be need to be known.
If the latter then something like this one 132684345863 on Ebay could be adapted and an encoder fitted to rear shaft.
You can get through-hole types or coupler mounted, the through hole are the easiest.
Unless you already have, you may have to search for the encoder you need, I have mainly used the quadrature differential type.
Or by RS422 do you mean this type, if so you need to find a one with suitable pulse count, usually at least 1200 p/rev which converts to 4800 p/rev when using the four edges.
There are also some nice motors with encoders on Ebay made by Sanyo-Denki
A suitably sized Advance Motion or similar drive would be needed.
Max.

I do have a specific application in mind.

The motor will be attached to a winch which will move loads (on wheeled platforms) laterally. 1hp should be sufficient, as a starting point.
The Mitsubishi A700 does have a +/-10v input, but as you say, also has a FWD and REV pin. If I "enable" only the FWD pin, and apply a negative voltage to the +/-10v input, would I have reverse motion?

By RS-422, I mean the encoder should have compliments for each channel (A and B), thus providing a differential signal.

As positioning and smooth motion is important, and the PID loop is based on position, not velocity, I would think an encoder with PPR upwards of 1000 should be sufficient.

I'd like to run tests on AC and DC motors - the problem is finding the right drive.

 

There is a difference between VFD/AC motor and servo drive/BLDC DC motor.
The VFD has one polarity input 0-10v not ±10vdc, you would contact close the direction you want and then exercise the 0-10v.
Often this input is a opto isolator so it also lends itself to solid state control input.
So that is a standard quadrature encoder which are fairly common.
If using a winch, you can economize on the motor size by using a gearbox if ultra high rpm is not needed.
Depending on torque required for the winch, one of the smaller DC treadmill motors could be converted.
Max.

 

There is a difference between VFD/AC motor and servo drive/BLDC DC motor.
The VFD has one polarity input 0-10v not ±10vdc, you would contact close the direction you want and then exercise the 0-10v.
Often this input is a opto isolator so it also lends itself to solid state control input.
So that is a standard quadrature encoder which are fairly common.
If using a winch, you can economize on the motor size by using a gearbox if ultra high rpm is not needed.
Depending on torque required for the winch, one of the smaller DC treadmill motors could be converted.
Max.

The Mitsubishi does seem to have a +/-10v input (terminal 5 I think).

 

The Mitsubishi does seem to have a +/-10v input (terminal 5 I think).

Yes it does appear to have that programmable option as well as the standard 0-5v 0-10v settings.
I have used Mitsubishi VFD's in the past and they are excellent, also good support.
Max.

 

Yes it does appear to have that programmable option as well as the standard 0-5v 0-10v settings.
I have used Mitsubishi VFD's in the past and they are excellent, also good support.
Max.

So the A700 may be an option. If so, how would I go about "enabling" the drive when motion is needed? If I "enable" the FWD terminal, will the negative voltage input still drive the motor backwards?

 

If using the ±10vdc option you wont need the FWD/REV terminal.
But if using this set up, how are you going to close the loop back to the controller?
Normally with a servo set up such as you appear to want, the drive is a simple non-intelligent amplifier and the encoder goes back to the motion controller.
Max.

 

If using the ±10vdc option you wont need the FWD/REV terminal.
But if using this set up, how are you going to close the loop back to the controller?
Normally with a servo set up such as you appear to want, the drive is a simple non-intelligent amplifier and the encoder goes back to the motion controller.
Max.

Essentially, I would be using the drive as a simple non-intelligent amplifier, as you say. The encoder will not be connected to the VFD at all, and instead will go back to the motion controller I'm designing.

Is there an option on the A700 where motion can only begin when a voltage is present on one of the lines (an enable signal)? I'm struggling to understand the datasheet.

 

It appears that when using the ±5/10vdc input the STF input has to be ON in order for the analogue to work, at least the way I read it.
Search through the manual and follow P73 tells most of it.
Max.

 

It appears that when using the ±5/10vdc input the STF input has to be ON in order for the analogue to work, at least the way I read it.
Search through the manual and follow P73 tells most of it.
Max.

Ahhhhh, ok. But will motion in the reverse direction still occur with a negative voltage input?

 

According to the manual the way I read it.
Max.

 

According to the manual the way I read it.
Max.

Great, what kind of voltage does it need to enable?
Could I just use a relay, and connect STF to SD?

 

Yes, just contact closure, I haven't checked but it should show the nature of the input, as before, it is most likely an opto, if so a contact or semi device , fet etc should do it.
Max.

 

Thank you, I'll give it a go, and let you know.