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Other Vintage Household Electrical or Electromechanical Items For discussions about other vintage (over 25 years old) electrical and electromechanical household items. See the sticky thread for details. |
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26th Dec 2018, 4:22 pm | #1 |
Hexode
Join Date: Jun 2005
Location: Buntingford, Hertfordshire, UK.
Posts: 362
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Magneta master clock model No:37 dial not moving
Hi All,
Seasons Greetings! My Magneta master clock has decided to pack up providing the minute pulse (It only has minutes) It has a dirty dial supply, a unregulated dc supply from a transformer and rectifier only (I apologise for that) It's been working fine up to now. The minute pulse has 3 connections, Common, NC & NO which appears different to any wiring circuits I've managed to find. I can manually open the NC contact and the dial moves by a pulse, but not when the pulse wheel opens the contact. Has anyone any suggestions. ATB Chris G1rpo PS: I'll build a better supply.
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26th Dec 2018, 5:07 pm | #2 |
Nonode
Join Date: May 2007
Location: Preston, Lancashire, UK.
Posts: 2,511
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Re: Magneta master clock model No:37 dial not moving
Chris, as it's been working up until now and manually moving the contacts works, I wouldn't worry about the supply until you've got it working again. It does sound like a mechanical problem with the contacts, so I'd take them apart and make sure everything is clean and free to move.
Andy |
26th Dec 2018, 8:01 pm | #3 |
Guest
Posts: n/a
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Re: Magneta master clock model No:37 dial not moving
Mine only has NO a contact for the dial but the NO contact has an NC (make before break) associated with it for arc suppression. They are very tolerant of PSU voltage and ripple no apologises needed, in fact an open circuit 24 ish volts PSU is probably ideal, you only need near full volts to get the movement going (mines 24V and happy with 18V of lead acid float charged) . Is the dial two wire?
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26th Dec 2018, 8:02 pm | #4 |
Guest
Posts: n/a
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Re: Magneta master clock model No:37 dial not moving
Error, mines 20V.
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1st Jan 2019, 11:19 am | #5 |
Hexode
Join Date: Jun 2005
Location: Buntingford, Hertfordshire, UK.
Posts: 362
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Re: Magneta master clock model No:37 dial not moving
Hi,
Thanks Andy & Merlin. Seasonal refreshment of visitors has delayed further work at the moment, but going to have another delve this evening. OK, I feel a bit better about the supply now. I think your right about the arc suppression. Yes dial is 2 wire. I am assuming the pulse is energising the dial (positive) rather than a negative pulse? the reason I ask, is that I can hear a hum from the dial when I switch the power on ( 1st thing I'll do when I get back on it is check with a meter) Best wishes for the new year. Regards Chris
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BVWS, VMARS, RSGB, DEHS, RAOTA Nothings too big or too heavy, otherwise it wouldn't be where it is! |