Brother TC-225 / TC-229 adventure!

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02 Dec 2022 19:02 #258347 by pikis
Well I'm working on Brother tc-227.. maybe it's different atc from 225.. even though everything were same till now..
There are total 7 wires. 4 for encoder, 1 for deceleration track, 1 for ground and 
​1 for +24v
Atc still works fine with original controller.
If I leave original powering all 5 encoder input wires are -23.9v. When I block encoder sensors it drops to -23.6v
If I unplug ground wire then all inputs are +13v
When I block sensors it drops to ~11.6v but thats not enough for bob to trigger input...
Is that how it should be? Only 0.3v drop when sensors are triggered?
I'm sorry it may sound stupid but I'm so confused about this.. 
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02 Dec 2022 19:09 #258348 by ihavenofish
That's not right. when switched, it should go from 24v to 0v or close enough. They should behave as an on off switch. You are doing something wrong.

The tc 221, 225, 227, 228, 229 are all the same principle. plausible they reversed to sourcing on the 227, but even then you got something weird going on.

I have the 229 wiring manual, I will look it up later and see if there's anything useful in there (im in the middle of wiring a room in my house haha)

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02 Dec 2022 19:37 #258351 by pikis
www.ebay.com/itm/175182704378

This is the same encoder.
It says for tc321, tc201, tc217 tc227
Maybe they are different then
 

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02 Dec 2022 19:45 #258355 by ihavenofish
different board layout, same function, but yeah, I guess it's entirely possible they are wired different. Odd though.

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03 Dec 2022 18:07 #258443 by pikis
So I fixed the issue with voltage drop..
Now it's 0v when not blocked and -24v when blocked
Any ideas how to switch that to +24v? because I cant' just switch encoder ground and +24v
I think all brother tc 227 IO is sourcing inputs. My original limit switches or home were also -24v but they worked just by flipping ground and +24v.
 

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05 Dec 2022 00:26 #258545 by andypugh
Where is the -24V sourced from? This feels like you are measuring from the wrong reference.

If the encoder is driven with 0V and +24V then it _can't_ output -24V.

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05 Dec 2022 08:08 #258566 by pikis
I' m measuring by putting one multimeter wire on encoder +24v and other on one of the encoder output wires
Encoder is getting power from mesa 7i77 gnd and v field ( it is same when I use brother tc 227 original wiring)

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05 Dec 2022 09:03 #258569 by pikis
If put pull up resistor to that input then it works. Is it ok if I do this for all encoder inputs on BOB?

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05 Dec 2022 09:04 #258570 by pikis

If I put pull up resistor to that input then it works. Is it ok if I do this for all encoder inputs on BOB?

 

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05 Dec 2022 12:34 #258585 by andypugh

I' m measuring by putting one multimeter wire on encoder +24v and other on one of the encoder output wires
Encoder is getting power from mesa 7i77 gnd and v field ( it is same when I use brother tc 227 original wiring)

You should have the black multimeter wire on the encoder 0V and the red on the encoder output. And then I think you will measure 0V /  +24V output. 

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