BB. wrote: »
And if you choose a three wire or three phase pump, that gives you the option of looking into VFDs (variable frequency drives). Lots of interesting options there... Soft start, variable RPM based on water pumping needs (volume/pressure), etc...
lazza wrote: »
Thanks for the info.... however this capacitor, and as I have seen in other well pumps here, appears to be constantly connected to the live and neutral wires... it's a separate, added part of the system and doesnt come with the pump. How does this affect the running of the pump?
mike95490 wrote: »
Well pumps. Big subject. I will only address common AC pumps, not solar or DC.
Pumps come in 2 basic styles. Single phase, and Three phase. Any pump over 1 HP, 3 phase is more efficient.
AC pumps can use 2 different types of caps. Nearly all have a START cap somewhere. This cap is only energized for a couple seconds to start the motor, and is then disconnected with a centrifugal switch in the motor.
Some motors can have a RUN cap wired to help correct poor power factor. Electronic Pump control boxes generally do not allow for this. (but you do get stall and run dry protection).
Single phase pumps can be further divided into Two wire and Three wire.
2 wire pumps have the motor start capacitor, miniaturized and packaged with the motor. When the cap goes bad, you
have to open the well, pull the pump, and at this point, I'd install a new system, pointless to put a new cap into an old system when you have all the parts out of the well.
3 wire pumps have the motor start capacitor in a control box. Some control boxes are a simple relay, some are electronic. It depends on how fancy you want to be. If this capacitor goes bad, it's easily replaced. They are generally more robust and live under more benign conditions than a cap crammed into a motor under water.
Some motors can also use an optional RUN capacitor, but only if the control box has provisions for it.
The Franklin Motor site has a lot of info about this stuff.http://www.franklin-electric.com/aim-manual.aspx
some other sites -http://homeimprovement.lovetoknow.com/do-it-yourself-plumbing/submersible-well-pump-wiring-diagrams
(has some links to schematics at the end of the article)http://www.franklin-electric.com/residential-light-commercial/controls/controls/control-box.aspx
Texas Wellman wrote: »
Franklin 2-wire motors have a BIAC switch in them and do not have a start capacitor. Faradyne (goulds and pentair) motors do have a capacitor built into the submersible motor for 2-wire pumps.
lazza wrote: »
Thanks for the info.... however this capacitor appears to be constantly connected to the live and neutral wires.
paul mwangi wrote: »
i have a single phase submersible pump, with four wires and a capacitor how do i connect the capacitor?