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Post by kostas on Aug 2, 2014 14:53:36 GMT 1
The potentiometer in my PV controller is gone, has anyone tried to replace this with a new potentiometer successfully?
Thanks
Kostas
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Post by bare on Aug 2, 2014 16:07:45 GMT 1
Unobtanium. A specific design item not normally sold anywhere.
MUCH easier to buy a recent model near new Yamaha EXUP servo (identical part)
For Very little money on Ebay or from a wreckers
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Post by kostas on Aug 2, 2014 17:51:47 GMT 1
You might be right there,
I got 2 potentiometers 7.5 k ohm from eBay this morning and then I started questioning myself if this would work out.
Does not look to hard, the meter stem will require to be shortened and formed to fit into the opposite gear.
I can't be the first to try this.. But hold on to your bad controllers as there might be a fix.
Kostas
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Post by bare on Aug 5, 2014 3:26:16 GMT 1
Pots, Can be disassembled and their parts swapped :-)
If one can redo the faces on Clocks, a pot is not impossible.
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Post by kostas on Aug 25, 2014 18:48:45 GMT 1
That was an epic fail for me,
Got the new potentiometer (wire wound 7.5 vintage as these are not used any more) just to go on and find out that our servo motors are fitted with carbon face sine potentiometers.
The controller doesn't just read the resistance from the meter but it sends about a volt of current and the meter returns a sine signal back for position feedback.
These are very rare old super hard to find meters, in other words I should have gone for a used pv motor in the first place and leave the experiments for someone else..
Kostas
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Post by kostas on Aug 25, 2014 18:49:59 GMT 1
PS
I have two 7.5 Kohm potentiometers for sale :-(
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