motor starting relay

I have a 230 volt, single phase, 5 hp motor on an air compressor. Not long
ago the capacitor starting switches failed, and I was unable to find new
ones. I did however find a couple of used ones to get going again
temporarly.

What I would like to do is replace the centrifical/mechanical switches with
a timed relay, but I'm not sure how to size the relay. The motor draws 23
full load amps, but I'm just swiching the capacitor start circuit. What's
minumum rating I should consider when I look for a relay?

Thanks,
Max


.

Relevant Pages

  • Re: motor starting relay
    ... ago the capacitor starting switches failed, and I was unable to find new ... What I would like to do is replace the centrifical/mechanical switches ... with a timed relay, but I'm not sure how to size the relay. ... One older method was to measure the current drawn by the motor and switch ...
    (sci.electronics.misc)
  • Re: motor starting relay
    ... long ago the capacitor starting switches failed, and I was unable to find ... What I would like to do is replace the centrifical/mechanical switches ... with a timed relay, but I'm not sure how to size the relay. ... One older method was to measure the current drawn by the motor and switch ...
    (sci.electronics.misc)
  • Re: Question re: voltage regulators & lost amps
    ... the tether instead of using batteries inside the vehicle. ... All that remains are the drive motor and the ... wires in the tether. ... For that relay, R needs to be 1000 ohm, 1 watt. ...
    (sci.electronics.design)
  • Re: Cheapest easy DC motor to survive locked rotor
    ... It would open and close based on a relay signal from a momentary ... >My problem is that the DC motor (pulled from a demolished HP X-Y ... when it hits the 'Up Limit' and take that switch out of the picture ... And you rig the crossing ...
    (rec.crafts.metalworking)
  • Re: Switching +/-12V from 6/0V
    ... Since the solenoid really does need a full 12V to ... I've found that if I connect a 220 ufd capacitor across the +10 and ... gate of an NPN, with the emitter grounded. ... it may just be that a relay is the way to go. ...
    (sci.electronics.design)