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Electric Store Display Clock

wspohn

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Feb 3, 2020
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I have had this Girard Perregaux store clock for many years. I bought it missing the power supply and am not sure whether it is an AC or DC clock. The only indication is a stencilled '24V on the back. It is a large 17" diameter clock and I would like to use it.

Does anyone know what sort of power supply this might need?

clock.jpg 6083.jpg
 

Tim Orr

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Good evening!

Can you show us a picture of the inside? I feel very certain we could decide whether AC or DC from looking at the movement.
Looks like there's a little red dot below the right-hand binding screw. That might be to indicate the + side of DC. Or just a stain on the cover.
It might even be a slave. Favag made a lot of clock systems.

One thing very interesting is that unlike a lot of store branding clocks, it doesn't appear to be cheap.

Best regards!

Tim Orr
 

wspohn

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No, it is a pretty solid piece. Have to disassemble from the front to get at the innards.

I will have to take it apart to see what is what, but the tempting thing to do is to hit it with 24 V DC with the polarity you mention and see what happens. It is possible that the power supply was just lost at some point.

the wiring to the connections is no help as it is green and yellow (I restore old cars where - except sometimes in Italy - red means positive and black means negative).
 

Tim Orr

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Good afternoon!

Taking another look at the face, I see there's a second hand. I retract my belief that it might be a slave. Could clip three 9v batteries together using their built-in contacts and see what happens. I doubt 27v would damage a 24v clock.

Best regards!

Tim
 

Toughtool

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I restore old cars where - except sometimes in Italy - red means positive and black means negative).
Just a bit of information, The ITR and IBM secondaries use a Green wire for +12 volts and +24 volts and the Black and white wires were taken to Negative, for their DC versions.

If it is a 24 V DC it most likely will be a pulse, not a continuous 24 volts. If it is AC, then it would be continuous. Need to see inside to determine if it is a coil or a motor.
 
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wspohn

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Solved the problem on this FAVAG slave clock. It turned out to be 12V DC and I found a reversing power supply - a board you put in the back of the clock and connect a wall wart power supply (they also sell battery powered versions). If anyone else s ever in this situation, look at Electric Clocks - Synchronous motor electric and impulse driven Slave clocks by Smith's Ferranti Temco Synclock Gents Westerstrand National Electric where they understand this sort of clock and sell custom supplies for them.

Here is one of the units run by battery.
apclockrear.jpg

amd the version that plugs into the wall

ec5apmntd.jpg
 

Tim Orr

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Glad you got it going!

Interesting that it turned out to be 12v in spite of the 24v stamping on the back. Interestingly, the picture shows you're powering with 9v, and the blurb on the manufacturer's site says that what you put in is what you get out. So, is it actually running on 9v? Is it actually a seconds-slave?

Best regards!

Tim
 
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