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Post by 508gm1 on Oct 20, 2022 22:06:09 GMT
Any chance there is a name plate on the compressor or close to it? I assume no but thought I would ask. Time delay fuse rated 125% nameplate value would be typical correct protection of any motor. For a similar comparison I have my unit protected by a 3 2/10 fuse. Probably 4A maximum size would be acceptable, but without a nameplate, it's hard to say. Your readings are concerning & I will submit that you will most likely blow the fuse on startup attempt. Fingers crossed I am wrong. Also want to be sure you don't damage your new step-down transformer.
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Post by cablehack on Oct 21, 2022 21:57:44 GMT
If you've ordered the Tortech transformer, it is fitted with a fuse on the primary side of the transformer (240V winding). It was a 3.15A time delay type, which was sufficient for starting my CA-2 Monitor Top. I soon replaced it with a 5A thermal circuit breaker, because after enough start ups the fuse would be sure to blow from the constant heating and cooling cycles. Since this is my main fridge, I didn't want that happening when I was away from home.
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Post by billy33 on Nov 25, 2022 1:52:13 GMT
OK, So i finally recieved the transformer and also the supco R081.
connected and the fridge started up as per before but its a lot quieter.
runs for a short amount of time - maybe 30 seconds as per before and then the relay trips.
not sure what my next steps are ? if shes cooked i guess i can take it to a fridgy and get them to install a new compressor ?
thanks
Andrew
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Post by turbokinetic on Nov 25, 2022 1:55:34 GMT
OK, So i finally recieved the transformer and also the supco R081. connected and the fridge started up as per before but its a lot quieter. runs for a short amount of time - maybe 30 seconds as per before and then the relay trips. not sure what my next steps are ? if shes cooked i guess i can take it to a fridgy and get them to install a new compressor ? thanks Andrew Hi Andrew. That's so frustrating! Have you measured the current going to the compressor from the transformer? Also have you tried interchanging the Start and Run wires to ensure there isn't some mix-up there? |
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Post by billy33 on Nov 25, 2022 2:13:59 GMT
hi, yes there was about 2 to 3 amps.. a lot less then when running on 240v... when on 240v it climbed to 10amps or so before the relay shut off...
no i didnt try swapping the start and run but ill give that a go later this arvo !
thankyou
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Post by turbokinetic on Nov 25, 2022 2:20:58 GMT
hi, yes there was about 2 to 3 amps.. a lot less then when running on 240v... when on 240v it climbed to 10amps or so before the relay shut off... no i didnt try swapping the start and run but ill give that a go later this arvo ! thankyou Wow.... so that was 2 to 3 amps on the 120V secondary side of the transformer, between the transformer and the compressor? That is actually the correct running current for the compressor. The RO81 will not trip with 3 amps. It requires more than 4 amps to trip. If the RO81 is tripping at that low of a current, it seems you may have a faulty part. |
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Post by billy33 on Nov 25, 2022 2:25:07 GMT
it was between the compressor and the supco on the run wire ( assuming it was the run wire and i didnt have run and start mixed up which i guess was possible ? )
i still get 0 resistance between start and run on the compressor... and 9ohms between the other 2
i also purchased the 115v supco with a capacitor at the same time so i can try that ?
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Post by turbokinetic on Nov 25, 2022 2:28:28 GMT
it was between the compressor and the supco on the run wire ( assuming it was the run wire and i didnt have run and start mixed up which i guess was possible ? ) i still get 0 resistance between start and run on the compressor... and 9ohms between the other 2 i also purchased the 115v supco with a capacitor at the same time so i can try that ? The resistance measurements don't make sense; however the Supco relay overload only measures the current on the input black wire which goes to the Run and Start wires. The Start turns off after about 2 seconds. So, if the Run wire had only 2 to 3 amps, it should not have tripped. I would try the other (capacitor equipped) device. |
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Post by billy33 on Nov 27, 2022 23:04:14 GMT
ok so i tried the supco with the capacitor... so the start wire ran at 4amps to start with and slowly over the course of a minute actually went back to 0. compressor started and you could hear it run... on subsequent attempts to start it the compressor would not run unless i gave it some time to 'rest' ? ive got no idea  thanks |
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Post by turbokinetic on Nov 27, 2022 23:16:18 GMT
ok so i tried the supco with the capacitor... so the start wire ran at 4amps to start with and slowly over the course of a minute actually went back to 0. compressor started and you could hear it run... on subsequent attempts to start it the compressor would not run unless i gave it some time to 'rest' ? ive got no idea thanks Hi Billy. These compressors do require a several-minute rest period between starts. The start signal tapering off after the startup is entirely normal. As long as the compressor keeps running after it starts, things are probably OK |
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