Cap Start/Induction Run vs Cap Start/Cap Run

[siamterm]

I was recommended to replace my old control box (for submersible pump) which was capacitor start/induction run with capacitor start/capacitor run one. Will somebody please explain to me the pro and con on both winding.

 

[jraef]

There is very little difference between the two, other than they usually go to CSCR when HP gets above 1-1/2, and CSIR at 1HP and under. Both have similar starting torque curves. The CSCR has slightly better efficiency, but hardly worth the cost of replacing a perfectly good motor. If, on the other hand, your old motor burned out and you have to replace it anyway, by all means do it with a CSCR.

http://www.aosmithmotors.com/pdf/brochures/bulletin3100/Acdc.pdf

Check out page 15+ for descriptions, and a chart on page 26 boils it down.

This one has additional information specific to pump motors.

http://www.aosmithmotors.com/pdf/brochures/3300.pdf

"Our virtues and our failings are inseparable, like force and matter. When they separate, man is no more."
Nikola Tesla

 

[aolalde]

Siamterm:
For submersible pump motors the voltage drop in the power supplying cables must be kept to a minimum. For that reason a "Capacitor start - Capacitor run motor" is very convenient due to the improved Power Factor and resultant reduction in line current.