--motor pumps water in a hot tub:
-1.5hp, single phase, 2 speed (120 / 240 VAC) with a centrifugal switch and 1 capacitor (I believe to be a start capacitor**note 1**)
-for other reasons and to the benefit of testing this motor, all the hot tub electronics are removed, the motor is simply hardwired in and switched by a breaker
-- motor starts and runs(centrifugal clicks) every time I give it power
-- runs, moves water for 1-5 minutes
-- rpm slows to the point that the centrifugal reengages the start winding and successfully restarts
-- after the first restart, this happens rapidly, after 20 seconds of running or so (that's 20 seconds after the centrifugal disconnects the start coil)
--if I run this on a bench with no load, it starts, runs and appears fine. (planning to try to set up a resistive load on the bench to simulate what happens when its installed)
--bench or normal operating load, the motor is not warm, there have no sparks or smoke and there is no burnt enamel smell (a smell I am familiar with)
--voltage is steady @ 122 VAC +- 1v (during all phases of operation)
--I don't know about spikes, but it was drawing just over 1A when running on low with no load, the badge says 1.7--i think that's fine.
--the GFCI breaker remains un-tripped through all of this.
at this point I am a bit stumped, but I am investigating the run coil & internal thermal protection(s).
here is my logic so far:
a) The start coil works quickly, and every time. and is disconnected when the problems happen, so that's not likely a problem.
b) Since the motor does run(& moves water), the run coil, at least, is not fried (open). If it were failing, I cant imagine I wouldn't smell the enamel.
c) so that leaves thermal protection, am I am not real well read on that subject...My guess is some sort of heat fuse? It does reset itself if that helps anyone ID the type.
I have the motor on my bench now and plan on opening it up to poke around with a multimeter. If anyone can suggest specific test I should run, please advise.
**note 1** removing the cap altogether causes the shaft to shake, not spin. This is characteristic of a failed start circuit. That leads me to think it is a start cap. additionally, a multimeter across the cap shows it charge to 120v and then drop to 0v when the centrifugal disengages it.
-1.5hp, single phase, 2 speed (120 / 240 VAC) with a centrifugal switch and 1 capacitor (I believe to be a start capacitor**note 1**)
-for other reasons and to the benefit of testing this motor, all the hot tub electronics are removed, the motor is simply hardwired in and switched by a breaker
-- motor starts and runs(centrifugal clicks) every time I give it power
-- runs, moves water for 1-5 minutes
-- rpm slows to the point that the centrifugal reengages the start winding and successfully restarts
-- after the first restart, this happens rapidly, after 20 seconds of running or so (that's 20 seconds after the centrifugal disconnects the start coil)
--if I run this on a bench with no load, it starts, runs and appears fine. (planning to try to set up a resistive load on the bench to simulate what happens when its installed)
--bench or normal operating load, the motor is not warm, there have no sparks or smoke and there is no burnt enamel smell (a smell I am familiar with)
--voltage is steady @ 122 VAC +- 1v (during all phases of operation)
--I don't know about spikes, but it was drawing just over 1A when running on low with no load, the badge says 1.7--i think that's fine.
--the GFCI breaker remains un-tripped through all of this.
at this point I am a bit stumped, but I am investigating the run coil & internal thermal protection(s).
here is my logic so far:
a) The start coil works quickly, and every time. and is disconnected when the problems happen, so that's not likely a problem.
b) Since the motor does run(& moves water), the run coil, at least, is not fried (open). If it were failing, I cant imagine I wouldn't smell the enamel.
c) so that leaves thermal protection, am I am not real well read on that subject...My guess is some sort of heat fuse? It does reset itself if that helps anyone ID the type.
I have the motor on my bench now and plan on opening it up to poke around with a multimeter. If anyone can suggest specific test I should run, please advise.
**note 1** removing the cap altogether causes the shaft to shake, not spin. This is characteristic of a failed start circuit. That leads me to think it is a start cap. additionally, a multimeter across the cap shows it charge to 120v and then drop to 0v when the centrifugal disengages it.