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Post by coldspaces on Sept 24, 2013 3:35:41 GMT
As far as I can see none of the manuals list just what the resistance of the compressor windings are. So lets post our info here and eventually we can consolidate it into a list.
Please include the year if know, the model of you refrigerating machine and of course the resistance readings of the windings.
Note that the DR compressors have a start resistor in the control that is in series with the start winding. I did not included its resistance in my readings
My 32 is a DR-2-G16 and the compressor resistance readings are, Common to run 3.1 ohms, Common to start 4 ohms, Run to start 7 ohms.
38 Flat top is a CF2-E16 and the compressor resistance readings are, Common to run 3.9 ohms, Common to start 18.3 ohms, Run to start 22.2 ohms.
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Post by cablehack on Sept 25, 2013 22:59:42 GMT
1934 CA-1-B15, start 23 ohms, run 3.6 ohms.
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Post by k5carrillo on Sept 26, 2013 16:23:09 GMT
1940's FEA-2-B16, Start 18.2 Ohms, Run 3.5 Ohms
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Post by allan on Sept 27, 2013 4:18:12 GMT
I have noticed that several monitor top compressors I worked on have continuity to ground but run fine. It would be interesting to also include the readings from each compressor lead to the compressor shell if you have this condition. My CK 2 had about 38K ohms to ground on all 3 legs but runs, starts, and operates fine. Also has correct run amps and wattage. Do you think maybe the refrigerant is slightly conductive? My CA 2 form A had about the same readings to ground but when I removed the MF it no longer had any connections to ground. Can't wait to recheck it when I get it recharged and running
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Post by coldspaces on Sept 27, 2013 4:28:52 GMT
I have noticed that several monitor top compressors I worked on have continuity to ground but run fine. It would be interesting to also include the readings from each compressor lead to the compressor shell if you have this condition. My CK 2 had about 38K ohms to ground on all 3 legs but runs, starts, and operates fine. Also has correct run amps and wattage. Do you think maybe the refrigerant is slightly conductive? My CA 2 form A had about the same readings to ground but when I removed the MF it no longer had any connections to ground. Can't wait to recheck it when I get it recharged and running Great idea. Only 38k That would seam low to me, wonder if grounding the machine would have been bad for it. Don't forget m oisture in the system can cause low readings to ground. Did you take your readings after removing the MF and before any vacuums were pulled? Will indeed be interesting to see what it does with fresh charge in it. |
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Post by cablehack on Sept 27, 2013 4:36:14 GMT
The maximum current that can flow through 38K of leakage is 3.1mA with a mains supply of 120V. Completely insignificant in terms of motor operation, but enough to be a shock hazard depending on circumstances.
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Post by coldspaces on Sept 27, 2013 5:09:43 GMT
The maximum current that can flow through 38K of leakage is 3.1mA with a mains supply of 120V. Completely insignificant in terms of motor operation, but enough to be a shock hazard depending on circumstances. Great info to know. What does it take to trip a GFI outlet? |
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Post by cablehack on Sept 27, 2013 5:59:22 GMT
Great info to know. What does it take to trip a GFI outlet? Not sure about in the U.S, but in Australia it's usually 30mA. |
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Post by myfridg on Apr 23, 2014 20:00:50 GMT
Without having a grounded plug will the GFI trip?
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Post by cablehack on Apr 23, 2014 23:26:54 GMT
Without having a grounded plug will the GFI trip? In that situation it will trip if there's an insulation breakdown in the fridge and someone or something grounded touches it. If you want it to trip immediately there's an insulation breakdown, regardless of whether or not anyone touches it, you'll need to ground both the cabinet and compressor - this is the safest option. |
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Post by myfridg on Apr 24, 2014 13:28:04 GMT
Thanks, I plan on changing the supply cord to a 3 conductor and connecting the ground wire to one of the 2 mounting screw for the junction box. I checked and found there is continuity from the screw to both the cabinet and compressor. The fridge has been in our family at least since the early 50's and probably longer and has been in my possession since the late 70's. I previously used it as a beer fridge but now only use it a couple of time a year when we are having picnics or family gatherings.
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Post by jhigdon2 on Apr 24, 2014 17:53:52 GMT
My newly rewound DR 2 stator is 2.6 run and 4.1 start.
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Post by coldspaces on Oct 20, 2015 2:40:51 GMT
Now that I have spent way too much time on Travis's D-35-A16 I decided to check the windings. Sure glad they test good.
Common to run is 3.7 ohms
Common to start is 5.6 ohms
Start to run is 8.2 ohms
Windings to shell no continuity at all.
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Post by coldspaces on Mar 31, 2017 0:50:10 GMT
Just needed to add what the readings are on a good DRF4 compressor motor, C-R- 1.4 ohm, C-S- 2.6 ohm, R-S- 3.9 ohm, over 40 meg to ground.
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Post by elec573 on Mar 31, 2017 6:04:29 GMT
Just wanted to answer myfridg yes a gfi outlet well trip. A ground fault circuit interrupter works on the premise that all the current going out comes back and it measures the deference between the two. (Between the neutral and hot so to speak ) and if there is a difference according to its specks it well trip. Electricity is always seeking the easiest path to ground it doesn't care what or who it goes through!
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