When the motor is close to running speed, the Start capaciotor is switched out of the winding circuits. Motor capacitors store electrical energy for the motor to use. A damaged or burnt out capacitor may hold only a fraction of the energy needed for the motor if its capacitance is low. Replaced with same and blew immediately. problem is the capacitor keeps blowing up. A bad motor capacitor may cause starting problems or could shut off the motor while running. we have a single phase submersible motor, rated 5hp at 230v, and operates on capacitor start controller. I recently had a similar problem with a 7 year old Pentair 1 HP single speed pump drawing excessive current and tripping the supply breaker. Also, look at our guide on "How To Use a Multimeter to Test a Pool Pump Motor - Winding Resistance" to check out the motor windings. 3. I have a Welch Vacuum Pump which contains an Emerson 8917A motor (0.5 HP, single phase, 120V, 4.6 amps). A motor starting capacitor is a non-polarized electrolytic capacitor that is rated for motor starting duty. I had a capacitor go bad on that pump before, with a bad capacitor the motor would hum until the motor thermal overload switch opened but it never took-out the breaker. Pool pumps are supposed to be completely airtight: this is what keeps them primed and sucking water properly. To understand why, you first need to understand how an electric motor works along with some basic electrical theory. ” Attie says: May 31, 2019 at 11:34 PM Hi, I have a question. One model of compressor motor start capacitor. Pool pumps may have two capacitors, one in the back (the start capacitor) and one on top (the run capacitor). 99. The start controller or centrifugal switch is defective and not disconnecting the capacitor when the motor comes up to speed. replaced capacitor and switch plate assbly. 2. In searching for a solution I have found this: 1. 7 thoughts on “ PSC Ep. Pump is recently new as is control switch/head bleed valve. After 3yrs no problems , one of the capacitors blew, motor would not start. The replacement capacitor is not a motor starting type capacitor of the proper voltage rating. i replaced the burnt capacitor with same microfarad rating, and it blew up again, replaced it with a higher reting microfarad capacitor, still the same thing happened. Posted on November 30, 2020 by November 30, 2020 by From electrical theory we know that 1 hp is equal to 746 watts of power. Reply 86: Why is my pool pump motor capacitor failing? Uncategorized pool pump motor keeps blowing capacitor. CAPACITOR TYPES - A pool pump can have two types of capacitors: a Start capacitor and A Run Capacitor. Pool Pumps Service Sharper Image Pools Tampa Bay. Right away it's obvious that this amount of power has the potential to generate a lot of heat. Here is a guide on "How To Replace AO Smith Motor Parts - Overview" that shows you what electrical parts may be involved. A residential pool pump uses a standard electric motor, which is usually between 1/2 hp up to and including 3 hp. The higher the capacitance of the capacitor the more energy it can store. had motor serviced at electric motor shop. I have a 28 ft round semi in-ground pool. The start capacitor (161-193 uF, 125V) failed (black goo everywhere, motor would hum but not turnover) and I replaced it and then it failed again (brown goo everywhere) after about 1 week of use. Try taking the motor into a pool store to see if they can test it for you. I have an Optiflo Pentair 1.5 hp above ground pump and want to switch over to a sand filter. The Start capacitor is switched into the the motor's winding circuits on start up to help the motor turn over and come up to speed. 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