[snakebit95]

Anybody have performance specs on the E728 motors?

Thanks in advance!!
Wayne

[unterhaus]

that would be nice. Got a brand new one, but no info.

[snakebit95]

Unterhaus,
Are you interested in parting with it? I may have found (1) other for sale, and I would like to have a matching pair for my CNC project. I have searched everywhere for specs. It is a shame that Rockwell does not make the old Electrocraft catalogs available online.

[NC Cams]

Have you tried Reliance Electric - most of the stuff I google cam up with Reliance, not Rockwell...

[snakebit95]

From my understanding, Rockwell purchased Reliance some years ago. Rockwell announced a couple of years ago that they were going to stop supporting the Electrocraft brushed-motors.

[snakebit95]

Here you go......I am guessing the E728 fell into this discontinuance too; since it is no-longer listed in their current catalog.

http://www.electrocraft.com/bulletins_brush_dc_disc.asp

And here is where Rockwell became the parent company:

http://www.electrocraft.com/bulletins_name_change.asp

[Al_The_Man]

I have them for 0728-39-003 (NEMA 56C) DC Brushed motor.
Al.

[unterhaus]

I'd certainly be open for offers on mine. What do people do about the tach?

[Al_The_Man]

I usually just take the brushes out and use Torque mode amplifiers, it is usually a pain to remove the tach entirely.
Al.

[snakebit95]

Those are some pretty serious motors (36 in-lb cont.). I had no idea that they were that BIG. I think they will be a little over-kill for my BP Boss retrofit, and may be too large for my Geckos to run. Since they do not have a shaft on the backside, it would be difficult to mount encoders on them. Maybe it would be better to mount the encoders on the ballscrews instead and just leave the tach disconnected? My current set-up only has a 56V power supply, which will limit the speed quite a bit too. Your thoughts Al?

[Al_The_Man]

At 56v those motors would still probabally give you enough torque, they are pretty big, I thought mine on my Excello (same as BP) were large, they are 27 in-lb.
If they have no rear shaft, it might be possible to remove the tach and fit through-hole encoders.
Al.

[snakebit95]

Al,
Thanks again!!

Unterhaus,
I sent you a PM on the motors.

[unterhaus]

Turns out the motor has a shaft sticking out the back past the tach. Mine apparently was wired for an encoder, there is an 8 conductor cable running from the junction box to the back of the tach.

[mackenzie09]

I have them for 0728-39-003 (NEMA 56C) DC Brushed motor.
Al.

I'm sure that this isn't the part that everyone else is interested in, but if you still have access to this page, could you please show the bottom with the wire specifications? I'm working on the electronics and wiring on a machine that uses this motor, and I can't find any useful information anywhere else on the web.

Thank you so much!

[Al_The_Man]

The motor and tach connections are usually fairly obvious, but shows 1pr red & Blk for Armature blue & white for Tach.
If it has the factory encoder, the colours are:
WHT = A
YEL = /A
GRN = B
BLU = /B
ORG = Z
BRN = /Z
RED = +5vdc
BLK = COM.
Al.

[mackenzie09]

Al,

That's a huge help. We bought all of this used and quite a bit is disconnected or missing. Thank you so much for shedding some light on it!

[Al_The_Man]

BTW, many of the encoders fitted were either 500 or 1000 p/rev and were made by Renco (those are 'Standard' Renco colours).
Renco now owned by Heidenhain.
Al.

[Ursmar]

I have them for 0728-39-003 (NEMA 56C) DC Brushed motor.
Al.

Hey Al,
do you have the specification for E728 0728-06-029?