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Single Phase Puzzle to challenge you

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Sprintst3000

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Hi
I have inherited a compressor with a single phase motor but its been stripped and I need to fathom out what's what.. I don't know if it even works as why did they take it apart and if its broken what's wrong!

I have a start and a running capacitor

[ElectriciansForums.net] Single Phase Puzzle to challenge you
[ElectriciansForums.net] Single Phase Puzzle to challenge you
A reset switch

Simple push button

Two cables with 2 and 3 wires respectively

[ElectriciansForums.net] Single Phase Puzzle to challenge you

So can anyone give me guidance on testing then rewiring this puzzel please!
 

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first question to you, have you got any test equipment and if so do you know how to use it?
 
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MDJ said:
first question to you, have you got any test equipment and if so do you know how to use it?
Click to expand...
Yes I have a multimeter and I have reasonable but maybe dangerous ability. ... I have measure the resistance between some points and I have O/C between the brown, 5.6ohms between brown and black (Both browns) 4.4ohms between the yellow and browns, 2ohms between black and yellow and finally 1.3ohms between black and blue
 
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Sprintst3000 said:
Yes I have a multimeter and I have reasonable but maybe dangerous ability. ... I have measure the resistance between some points and I have O/C between the brown, 5.6ohms between brown and black (Both browns) 4.4ohms between the yellow and browns, 2ohms between black and yellow and finally 1.3ohms between black and blue
Click to expand...
a multi meter is of no use, you need to whack 500 volts between the windings and earth just to start with, then between windings and if good then start looking at other things, could be many reasons why it is not working, we cannot advise you what is wrong on here without seeing and testing it, we can suggest things all night but a multi meter reading whatever it says IME is pointless regarding testing a motor for faults
 
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MDJ said:
a multi meter is of no use, you need to whack 500 volts between the windings and earth just to start with, then between windings and if good then start looking at other things, could be many reasons why it is not working, we cannot advise you what is wrong on here without seeing and testing it, we can suggest things all night but a multi meter reading whatever it says IME is pointless regarding testing a motor for faults
Click to expand...
Well assuming the coils haven broken down to earth could we at least sort out the wiring! I was expecting to see two coil resistance values.
 
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Sprintst3000 said:
Yes I have a multimeter and I have reasonable but maybe dangerous ability. ... I have measure the resistance between some points and I have O/C between the brown, 5.6ohms between brown and black (Both browns) 4.4ohms between the yellow and browns, 2ohms between black and yellow and finally 1.3ohms between black and blue
Click to expand...
also there are several items which could be a problem, bearings, brushes, armature, shaft, windings shorting to earth, a multi meter not sufficient to check this bit of kit out
 
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MDJ said:
also there are several items which could be a problem, bearings, brushes, armature, shaft, windings shorting to earth, a multi meter not sufficient to check this bit of kit out
Click to expand...
Bearings = Good
Brushes = Good
Armature = not sure
Shaft = Good
Windings = Not sure
Motor age = 2021
Usage = light
Mechanically excellent
Clean
Wiring - not wired at all
 
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brianmoooore said:
Also, your results don't make sense. If you have 5.6 ohms between black and each brown, then the maximum you are going to see between the two browns is 2 x 5.6 ohms =11.2 ohms, not O/C.
Click to expand...
I did fear that there is a break but I don't have the confidence in my wiring/fault finding ability without a circuit diagram .. I might take it apart and check for the obvious
 
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I've been asked to 'look at' a few of these DIY type compressors over the years, and the usual scenario is that one of the capacitors has failed. Replace it, and it'll run for a week, until the replacement capacitor fails as well, which is probably because the winding has developed a few shorted turns.
These tend to be cheap and nasty single phase motors, which aren't really single phase at all. They are modified three phase motors, using the run capacitor produce a phase change and simulate a poor three phase supply.
 
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Have you got the lid of the connection box on the motor? Often there's a wiring diagram inside the lid.

What is the make and model number of the motor? Somewhere on the motor there should be an information plate, can you post a pic of it please?
 
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