Need Help!- Possible bad encoder on X servo

[Woody111]

If you have not sent this motor out yet I know of a shop in the Pittsburgh PA area that has alot of experience with SEM motors. The are a dedicated servo repair shop and can realign encoders remag motors and they offer a free evaluation. Only cost you shipping. If need a name and phone # contact me at 814 720-5336 leave a message. Woody

[Al_The_Man]

Originally Posted by joejared Should you install a different encoder and the coordinates are backwards, exchanging the A and A- lines with B and B- will correct the problem.

Also swapping A and A\ will do it.
Al.

[joejared]

Originally Posted by Al_The_Man Also swapping A and A will do it. Al.

True, but don't you also need to swap B and b- as well?

norm = inverted A
A/B A-/B
00 = 10
01 = 11
10 = 00
11 = 01

It appears that the motor will go in the same direction with A inverted.

AB = A-/B-
00 = 11
01 = 10
10 = 01
11 = 00

Both A and B channels need to be flipped, either in using the inverting signals, or by way of exchanging A and B entirely. For non-buffered chips, A and B would need to be swapped, which might lend credibility to being consistent in methods.

[Al_The_Man]

No, done it many times, swapping one changes the phase relation from leading to lagging or vice-versa for a given channel and direction.
Al.

[bherr]

Originally Posted by Woody111 If you have not sent this motor out yet I know of a shop in the Pittsburgh PA area that has alot of experience with SEM motors. The are a dedicated servo repair shop and can realign encoders remag motors and they offer a free evaluation. Only cost you shipping. If need a name and phone # contact me at 814 720-5336 leave a message. Woody

Woody,
good to know. I've got a replacement encoder coming and should be here on Monday. Keith out of Mass. had one.

Ben

[ricardo_avila]

I have exactly the same problem as you did. Same encoder, Y axis, Bridgeport Interact 412. What did you do? Did you part with the $300 to $600?

[sclark58]

This site is great! I have had a number of calls. The foto is an ERo-115 type encoder. The line count may be 125 or 200. The were used on the old Bports made in the 1980's. There are alot still out there. We typically find a short has taken out the referance signal. Sometimes it only needs to be cleaned-up to get out the graphite dust.$317 is the cost to reurbish the motor to factory spec.