starting circuit for motor

Discussion in 'The Projects Forum' started by Romac Ent, Apr 13, 2007.

  1. Romac Ent

    Thread Starter New Member

    Apr 13, 2007
    I have a single phase 1/12 hp, 3200 rpm capacitor start motor.
    3 leads 1-red to capacitor, 1 hot, and 1 neutral. When I apply power to the motor it hums. touch a jumper to the capacitor and it starts and runs lke a charm.

    I need some kind of relay that will energize the capacitor long enough to start the motor and the open up. With no load on the motor, the draw on start up is about 3 amps. It will be running a magnetic drive water pump so I don't think it will ever go over 5 amps.

    does anyone know what I need and where to get it?

  2. thingmaker3

    Retired Moderator

    May 16, 2005
    Current when at speed will be less than start-up current. Some motor designs take advantage of this by using a relay that energises with start-up current, but drops out at running current. One source of start-up relays would be appliance repair houses. You'll need one sized specifically for your motor.
  3. Romac Ent

    Thread Starter New Member

    Apr 13, 2007
    Thanks for the direction!
    I'll try that next!!!