That highlighted area would be illegal... you cannot use 3 separate 1 pole breakers in lieu of a 3 pole breaker. Someone has cobbled together a Frankenstein disconnect, probably because whatever they had in there before kept tripping or clearing, so they put in the type D breakers because they have a higher instantaneous trip point. But the REAL problem was the motor failing (probably insulation) so the problem kept getting worse and moved up to the 125A breaker, causing it to trip now. On a Siemens HEB breaker, the Instantaneous (magnetic) trip for a 125A breaker will be 1250A. if it's tripping immediately, that's a SERIOUS problem.
Not saying "backwards" is not a possibility but as I recall if that type compressor runs backwards for any length of time, you carry it our in a bucket
Had one of my guys at a previous company call and said he couldn’t get one to run more than a couple of seconds. It was a used one the customer brought in to replace an old piston compressor. I asked him if he checked the rotation, and if it was running backwards, flip two phases. ( he didn’t tell me it was an air screw, probably wouldn’t have known the difference anyway) He calls back, and said he tried it several times, still tripping. I drive down there (it was in South Georgia) everything looked good, put the meter on it, flipped it on, rattles, trips the breaker. Flipped the phases, turn it back on, purrs like a kitten! He was swapping all three wires every time, even though I specifically told him to swap only two wires. I also found someone bypassed the phase loss relay, or it wouldn’t have started at all.Not saying "backwards" is not a possibility but as I recall if that type compressor runs backwards for any length of time, you carry it our in a bucket
Both!!?
Not saying "backwards" is not a possibility but as I recall if that type compressor runs backwards for any length of time, you carry it our in a bucket
