The Shop > Electronics & IC Programing
need help with my pump!
ieezitin:
Well guys I installed the capacitor and orientated the pump in the position that it should be run and turned it on and it still gives off a hum and draws current that makes my lights go out. So now what do I do?
John Hill:
Either the motor has totally karked or there is something preventing creation of the necessary starting torque.
Some motors have a switch that closes when the motor stops and that closes the starter circuit, when the motor begins to spin the switch opens. If the switch fails to close the motor will not start.
So, peer into the end of the motor and see if you can find anything that looks like contacts etc, these switches are often not much more than some bits of bent metal with a light spring attached.
If the spring is broken there is no incentive for the switch to close, if the contacts are burned and not making contact that could be another reason for no starting circuit.
Be careful with the capacitor, it can be charged up to lethal levels!
Bernd:
Is the motor and pump free wheeling when assembled? I would have to say you have a binding problem somewhere.
Bernd
ieezitin:
Thanks to all again for helping.
John. I will look for the spring switch thing. Great advice about the stored energy in the capacitor. Just what is the right way to discharge the energy?
Bernd. a lot of people have mentioned the same thing. What puzzles me is that when I spin the motor by hand I feel a little resistance but! that’s the bearings, I cant feel lumps or get the rotor stuck.
Thanks to all. Anthony.
Darren:
--- Quote from: ieezitin on January 22, 2010, 09:51:11 AM --- Great advice about the stored energy in the capacitor. Just what is the right way to discharge the energy?
Thanks to all. Anthony.
--- End quote ---
Simply grab both ends of the capacitor in each hand and it will discharge quite nicely. When you have stopped dancing and the burning smell drifts away you will know that the process has completed ....
Or if you prefer,
Use a wire and resistor across the terminals to discharge the cap. The resistor slows this down to put less strain on things.
The second idea sounds good to me, but the choice is of course yours as always ..... :zap:
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