motor help

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Gordon Edwards - 27 Aug 2006 18:38 GMT

Hi Guys, I hope you can help me. I've managed to get a hold of a compressor
with a busted motor. I already have a motor to fit to it, but don't know if
I need a starter also. It is a Brook Crompton ED90LD single phase which I
think is capacitor start induction run. It has a large capacitor on the
side. Any ideas.
Thanks
Gordon

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Bob Minchin - 27 Aug 2006 20:47 GMT

> Hi Guys, I hope you can help me. I've managed to get a hold of a compressor
> with a busted motor. I already have a motor to fit to it, but don't know if
[quoted text clipped - 3 lines]
> Thanks
> Gordon

The motor should have a centrifugal switch internally to switch the starting
capacitor into circuit during start up.

Depending on your compressor, you may need a contactor to turn the motor on
and off as dictated by the pressure switch.
Find the pressure switch and see what current it is rated at.
Looking at the exisitng wiring may help unless this information has been
lost when the old motor was removed.

hth

Bob

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scruffybugger - 30 Aug 2006 16:46 GMT

When running on single phase, I would reccomend an output governor on
the compressor rather than a pressure switch. Single phase motors don't
really like being asked to start more than 4 times per hour. I put in a
little eletronic gizmo that displays electrical consumption when the
shop was rewired about 4 years ago. The pressure switch was dumped
about 2 years ago. I haven't noticed a significant increase in
consumption, even though the compressor use hasn't changed.
Cheers, Scruff.

> > Hi Guys, I hope you can help me. I've managed to get a hold of a
> compressor
[quoted text clipped - 18 lines]
>
> Bob

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Christopher Tidy - 27 Aug 2006 21:32 GMT

> Hi Guys, I hope you can help me. I've managed to get a hold of a compressor
> with a busted motor. I already have a motor to fit to it, but don't know if
> I need a starter also. It is a Brook Crompton ED90LD single phase which I
> think is capacitor start induction run. It has a large capacitor on the
> side. Any ideas.

The main requirement for the switch is that it can handle the surge
current when the motor starts. A contactor has a couple of advantages
over a manual switch: it can be wired into a pressure switch, and it
won't restart your compressor after a power failure.

If you need more information about the motor, call Brook Crompton. I
think their number is on their website, and I've found them helpful in
the past.

Best wishes,

Chris

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Model Forum / General / Models / August 2006

motor help