Hi Jeff,

Funny thing, every motor and pump belongs to a car! The jobo factory was down the road from a car plant so they just used parts that were cheap and plentiful.
Why reinvent the wheel when you don't have too. The rotation motor is a windshield wiper motor for an old BMW.
The lift motor is a passenger window lifter and the water bath pump is a coolant pump.
It does make second sourcing a little easier...sometimes. The motors are getting rarer these days in the US. The pump is easy to get even on amazon.

My luck would have it that in the pounds of diodes I have, the largest zener is a 27v 1 watt which wont work. Tons of rectifier, Schottky, signal and power...sadly only a handful of zeners.
I also have a lot of TVS diodes 1.5KE300A (300v ish breakdown) and some 1v5KE51CA (43v ish breakdown and bidirectional).
Would either of those TVS Diodes work in place of 2 watt zener?

Im not sure the current limiter or torque limiter works as intended. I can try to stall the motor but the only thing ill accomplish is breaking the nylon transfer gears.
They act as shear pins, whether by design or happy accident, they’ll break before the motor stalls, or tear up my hand.

If I do load the motor down with a much heavier drum filled with 1L of chemistry, it does bog down but it keeps going at the required speed.
The logic from pin 3 is 5v.

Thanks again!

Yes, I should've remembered that before assuming the drive motor ran on 115VAC!

A 43 ish bidirectional TVS sounds good to me.

Perhaps it's not working, or perhaps my hasty inferences regarding that circuit are incorrect. It might be helpful if you have any documentation that comments on the function of the 20K potentiometer, P1. Meanwhile, if the transfer gears aka shear pins seem satisfactory as torque limiters, then maybe you can just rely on that!

-- Jeff

_________________
In 1988 my 65C02 got six new registers and 44 new full-speed instructions!
https://laughtonelectronics.com/Arcana/ ... mmary.html

Hi Jeff,
Cool! I will make another perf board with some stak-ons (have a lot of board mount ones) and the TVS diodes.
Ill let you know how it ends up.

I have attached the only mention of the P1 pot in an old service manual for the older model.
The boards are close cousins. Some differences but it looks like the motor control section is identical.
The manual is definitely a poor translation from German to English. And the entire section that relates to the transformer board doesn’t exist.
This manual refers to the ATL 2 and 3 which are late 80s machines. There is no mention of it in the service manual that goes with my 2300.
I think you're right that it relates to the stall current but on my machine the way it acts is different.
When it starts, it does a half turn probably to find home, then a 3 or 4 full rotations. All of the ATL 2x00 ive seen act the same way.
I don't remember how the ATL 2 and 3s started up, long time ago.


I have a wonderful FujiMoto CP-51 paper processor made in Japan with AC motors and pumps (100v AC). Considering how leaky it can be, it’s a little terrifying that they chose AC instead of DC.
Though I see why, they needed a lot of consistent torque at a relatively low speed, also had to have an adjustable speed for various paper and chemistry types.
I think the most important part was space considerations. No room for a giant transformer and rectifiers. It is after all a tabletop processor (as in it takes up an entire tabletop).
There is an emergency drain in the bottom of the processor, though it really looks like an afterthought.
They also mounted the motors and connection blocks to the top of the case in the hope it wouldn't get wet.
Best laid plans as they say, when a hose leaks its always on the pressure side and can form a nice jet. Without fail its always aimed at something you don't want to get wet.
And do I have stories on this one. Had to do some major surgery on it, the PiD temp controllers died and I had to make a new one. It isn't pretty but it works!

Diodes? As your TVS diode is bidirectional it will serve to replace both of the zeners in the diagram I posted. So, you just need a single 43V TVS diode. (You could put 2 or more identical TVS's in parallel to increase the amount of energy that can safely be dissipated. I don't feel that's necessary. But if the idea appeals to you, go ahead!

Hm, do you have access to the original German manual? There's a technically literate German speaker on this forum... Perhaps he could be coaxed to render an expert opinion on the matter in question!

-- Jeff

_________________
In 1988 my 65C02 got six new registers and 44 new full-speed instructions!
https://laughtonelectronics.com/Arcana/ ... mmary.html

Hi Jeff,

It works! The switch stops and starts the motor no problem.
I did find out that the whatever state the heater was in (Relay on or off), stays when the processor is paused.
I don't think it will be a big issue, the water pump still runs so it shouldn’t go into thermal overload and the pause time wont be too long.

That’s the only manual I have ever seen. Im sure one exists in Germany but they only ever sent me the English translations.
Its not horrible and could be much worse.

Thanks again for all of your help!

_________________
http://WilsonMinesCo.com/ lots of 6502 resources
The "second front page" is http://wilsonminesco.com/links.html .
What's an additional VIA among friends, anyhow?

Thanks for pointing that out. It probably wont ever reach its lifespan in my use case.
But I do have the zeners ready for my next digikey order.

I could be mistaken, but I thought it was MOVs that suffer a little damage every time they absorb a transient. Or maybe MOVs and TVSs both do.

-- Jeff

_________________
In 1988 my 65C02 got six new registers and 44 new full-speed instructions!
https://laughtonelectronics.com/Arcana/ ... mmary.html

This looks like an interesting discussion... but I don't see it fitting the subject anymore, or is it? Maybe rename or extend the subject? Just so that I don't again click on it

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Author of the GeckOS multitasking operating system, the usb65 stack, designer of the Micro-PET and many more 6502 content: http://6502.org/users/andre/