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Post by csulaguy on Jun 27, 2019 8:05:38 GMT
I have a CG that I got for free about 2 months ago. Finally decided to see if it works. I didn't check wiring directly to the compressor yet, but I'm seeing about 200K-300K resistance from start and run to ground. Assuming that my wiring straight to the motor is okay, should I assume this is a lost cause for now? I tried hooking it up to a Supco to see if I could start it, as the relay it came with was somewhat messed up, but nothing happened.
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Post by cablehack on Jun 27, 2019 12:35:42 GMT
200K to ground is fine. Minimal shock hazard. I wouldn't be surprised if it was even lower than that - dirt around the terminals inside and outside the compressor, as well as imperfect wiring insulation for the motor windings all contribute to this. 200K of resistance will pass only about 500uA - quite insignificant. For it to be a shock hazard the leakage would have to be a lot more than this, and even then you can ground the top to eliminate any tingles when you grab the door handle.
More importantly is to have continuity between each of the compressor terminals of fairly low resistance, and that the motor runs.
In the case of a complete internal insulation breakdown, you could run the fridge off an isolating transformer.
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Post by csulaguy on Jun 28, 2019 5:08:01 GMT
Hmm... I might see about running new wires from the terminals, just to see if I have better luck. If not, I'll be honest - after seeing the cabinet construction (calling it a budget line is too nice), up on Facebook marketplace it goes. I got it to use at the train museum in the caboose I stay in, but I might just use a DR-1 instead.
So I think we'd agree, 500mA isn't squat, especially for starting.
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Post by turbokinetic on Jun 29, 2019 12:01:13 GMT
Hmm... I might see about running new wires from the terminals, just to see if I have better luck. If not, I'll be honest - after seeing the cabinet construction (calling it a budget line is too nice), up on Facebook marketplace it goes. I got it to use at the train museum in the caboose I stay in, but I might just use a DR-1 instead. So I think we'd agree, 500mA isn't squat, especially for starting.
Hey Paul - what sort of resistance do you have from common-run, common-start, and start-run?
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Post by cablehack on Jun 29, 2019 13:28:04 GMT
200K insulation resistance has nothing to do with starting and running. More importantly is what happens when 120V is put directly to the common and run terminals on the compressor and manually starting the motor with the start terminal. It would surprise me greatly if nothing happened. I seem to recall the on/off switch was not an uncommon fault with CG's, or so I was told by someone who had worked on a number of them.
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