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Old 12th Dec 2020, 4:39 pm   #1
onewatt
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Default Magneta electric clock fuse link

Hi Guys,
My slave clock face has ceased movement.
Although I canít see much in the way of remnants I believe the pic is a fuse link which no longer has its link.
Iím assuming ma drive is required, but just checking with those in the know.
Vy Bst
Chris
g1rpo
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Old 12th Dec 2020, 5:00 pm   #2
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Default Re: Magneta electric clock fuse link

That is (was) the rather ingenious spark suppression resistor. It uses a make before break change over contact. I suspect all that has happened is the contacts have eroded, a quick going over with a bit of emery will sort it. Attached a picture of mine, it measures 820 ohms, anything near that will do.
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Old 12th Dec 2020, 5:07 pm   #3
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Default Re: Magneta electric clock fuse link

And a couple more pictures of the whole thing, on the right is the 30 second contacts for the house clocks with the synchroniser which I run off a dedicated MSF (UK time on 60kHz) clock that gives it a shove (two, one before the epoch to prevent +/- one second ambiguity) at 3PM every day.
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Old 12th Dec 2020, 5:09 pm   #4
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Default Re: Magneta electric clock fuse link

Thanks Merlin,
Itís never had one in the 15 years or so Iíve had it , so I guess Iíve been lucky to have it working this long.
Iíll clean contacts and see what happens.
Many Thanks
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Old 12th Dec 2020, 5:31 pm   #5
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Default Re: Magneta electric clock fuse link

I do wonder why it got removed? Don't hesitate to ask about anything relating to a Magneta, I did a lot of research when I got mine, rather good Hipp toggle clocks and in my opinion better than the standard PO36 (Post Office clock number 36). To confuse visitors I keep the case dial on GMT and the house clocks on GMT/BST, all for fun.
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Old 12th Dec 2020, 5:37 pm   #6
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Default Re: Magneta electric clock fuse link

What voltage is your dial, mine is 20V written by hand on the case of it. This makes me think other voltages where available, as the Hipp magnet works on a nominal 4V I guess mine was for a multi dial set up, it has the extended case to hold three Leclance cells presumably to keep the clock running while the slaves had an external supply (mains perhaps).
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Old 12th Dec 2020, 5:40 pm   #7
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Default Re: Magneta electric clock fuse link

Sorry for rambling over these posts. I note your Hipp toggle magnet has one of those resistors as a model for a replacement.
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Old 12th Dec 2020, 5:44 pm   #8
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Default Re: Magneta electric clock fuse link

Thank you, much appreciated. I got left this one and so intrigued with the simplicity and accuracy I ended up with a couple more similar clocks.

Iíve attached another picture of the problem contact. It looks like I may need to replace the contact as itís almost disappeared on the rh leaf. Iím missing something though! I can get the minute to move if I open the left contact manually before the movement cams and if I hold the movement as if the movement has camíd and separate the contacts manually it also moves the minute hand. But it does nowt when the movement is left to operate normally. Is this an adjustment fault or still a contact fault?
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Old 12th Dec 2020, 6:06 pm   #9
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Default Re: Magneta electric clock fuse link

There is not a lot of contact to start with anyway, they look about the same as mine. A case of (when) if it works why change it. I measured the resistance of my Hipp magnet resistor, 100 ohms, makes sense as 4V vs, 20V is 5, 100 vs 820 is 8, near enough for electromechanical stuff.
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Old 12th Dec 2020, 6:31 pm   #10
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Default Re: Magneta electric clock fuse link

Ok, Supply is iro 12vdc
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Old 12th Dec 2020, 8:03 pm   #11
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Default Re: Magneta electric clock fuse link

It is said that the "correct" Hipp supply will give a pulse every 20 to 30 swings of the pendulum. Mine does 17 to 18 but it is driving two count wheels. What does yours do?
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Old 12th Dec 2020, 8:24 pm   #12
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Default Re: Magneta electric clock fuse link

63/64 sounds a lot!
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Old 12th Dec 2020, 8:33 pm   #13
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Default Re: Magneta electric clock fuse link

With 12V I would expect that, three times as much (plus a bit for only one wheel to drive), what does your dial movement say on it as per voltage?
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Old 12th Dec 2020, 8:40 pm   #14
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Default Re: Magneta electric clock fuse link

Iím telling porkies Re voltage! Itís running at about 20vdc
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Old 12th Dec 2020, 9:49 pm   #15
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Default Re: Magneta electric clock fuse link

Same as mine.
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Old 12th Dec 2020, 9:53 pm   #16
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Default Re: Magneta electric clock fuse link

Hi Merlin,
I have the clock face energised permanently and so the minute trigger needs to break the supply to trip, but I have supply volts to all three contacts on the trigger mechanism which means the clock doesnít drop the supply. Iím missing something? I tried a 820 ohm resistor across the spark suppressor connections but no diff, which I expected.
Have cleaned the contacts, but can only trigger minute trip if I manually separate contacts.
Any suggestions? Itís not that complicated fgs!
Vy bst
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Old 13th Dec 2020, 7:13 am   #17
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Default Re: Magneta electric clock fuse link

Here. https://www.britishtelephones.com/clocks/clock36.htm The contacts are the same in all positions.
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Old 13th Dec 2020, 7:15 am   #18
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Default Re: Magneta electric clock fuse link

You want the GMT32, first one.
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Old 13th Dec 2020, 12:03 pm   #19
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Default Re: Magneta electric clock fuse link

This is what it should be like, the idea was to save power only having the resistor across the coil when it mattered. I had a look at the power supply I built, the Hipp is supplied from a 5V regulator off the 21V (float charged lead acid of 9 cells) rail.

It is a bad idea to have the dial energized for most of the time, it will get warm and waste power. The Hipp will probably be OK on 20V but if you can make it four to five volts giving a more frequent and gentle pulse that will be better.

I love my clock, it is in the kitchen where I spend most of my home time, the sounds it makes are reassuring and quite beautiful.
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Old 13th Dec 2020, 7:23 pm   #20
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Default Re: Magneta electric clock fuse link

Quote:
Originally Posted by merlinmaxwell View Post
Here. https://www.britishtelephones.com/clocks/clock36.htm The contacts are the same in all positions.
Thanks for posting, I have a clock No. 36 MK6 here not working and hadn't found the data yet.
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