The Craftmans Shop > New from Old
Puma / Dorman 6LE / MacFarlane B46B / 110 kVA Generator Resurrection
PekkaNF:
Good job. Where do you think phase swap has been done? Usually in the easiest point at the either end of the power cable.
awemawson:
At the moment I've swapped it inside the compressor control panel, being the easiest option. I need to hook up a 'known motor' to the generator and prove that it's o/p is correct and if not swap it. I do actually have a phase rotation meter tucked away somewhere so I suppose I really should give it an outing to the real world!
awemawson:
So it turns out that the generator is putting out the phases in the wrong rotational direction. Very odd - the wires from the alternator itself are very clearly colour coded and these codings were followed all the way to the output socket. However I've now reversed L1 & L2.
This was proved with my Phase Rotation Meter - for some reason I can't download the video I took from my 'phone although it plays on the 'phone :scratch: This meter is basically a little motor spinning a disk whose direction indicates phasing.
So connections returned to standard on the Hydrovane control panel, and another test run with a clamp meter on phase 1, showing a 'rest' running current of 34.8 which is pretty well spot on the motor plate figure.
. . .still a puzzle why the main alternator is wrongly marked :scratch:
PekkaNF:
uuuh....???? alternator magnetizing circuit polarity?
awemawson:
Trying to get my head around that but I don't think that it would change the order of the phases, just the phase of the phases :scratch:
Have a picture of the phase rotation meter just for the sake of completeness !
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