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Old 25th Feb 2024, 5:02 pm   #1
osx86apple
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Default IBM/ITR master clocks

Hi everyone,

I have a couple of IBM/ITR master clocks and wondered whether I’d get away with powering each of the a 24V transformer that’s designed to power LED lighting?

Reason being, they are pretty low profile units and would fit quite nicely in the casing!

Just wondered how they might behave in this application? I’m not driving slave clocks so it’s only to energise the coil once a minute so the clocks can self wind.
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Old 25th Feb 2024, 5:34 pm   #2
mark_in_manc
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Default Re: IBM/ITR master clocks

I'm not quite clear on your question. The IBM/ITR master clocks I have seen (and one of which I use here) are long-case pendulum things which self-wind using an electric motor which runs constantly, driving an eccentric. I am not sure what voltage the motor is - there is a transformer in the case, so it might not be 240v. The master provides 24v pulses once a minute to drive the slaves, which are round things which hang on the wall. Which is it that you have? If the latter, and you want to retain the movement, you'll need a 24v pulse once a minute which will drive the hands around appropriately - no winding involved.
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Mark
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Old 25th Feb 2024, 5:48 pm   #3
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Default Re: IBM/ITR master clocks

Hi Mark,

Thanks for the reply.

Mine are the later variant which has a mainspring vs the weight movement which I believe those were wound by a 240v motor. The type I have is similar to here http://www.hvtesla.com/masters/itr.html
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Old 25th Feb 2024, 6:27 pm   #4
Nickthedentist
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Default Re: IBM/ITR master clocks

I have one like that

Yes, mine too has a CHUNKY coil which is energised once a minute (via contacts on a cam driven by the timekeeping movement) to keep the mainspring wound.

These cases are huge and deep, so I'm not sure low-profile is a necessity.

Do your LED transformers actually give out 24V, or are they a constant voltage output?

Either way, you could rig one up with suitable current and voltage monitoring, then hold the switch contacts closed and see what current flows, and whether the voltage across the coil is near enough 24V.

Obviously, suitable fusing in the finished design is essential.

I bought mine for next to nothing 25 years ago and have only just got round to playing with it. Still not got as far as applying power yet though.
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Old 29th Feb 2024, 2:24 pm   #5
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Default Re: IBM/ITR master clocks

The power supplies for LED lighting are normally constant current driver units, not constant voltage and chosen to meet the current required by the LED(s). Also some types of LED driver are not isolated from the mains, they might not be happy with an inductive load either.

David
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Old 6th Apr 2024, 2:45 pm   #6
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Default Re: IBM/ITR master clocks

Sorry for the late reply’s on this, been a hectic few months. An LED transformer has seemed to have worked very well with no adverse effects, with suitable fusing to be on the safe side
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