we have a single phase submersible motor, rated 5hp at 230v, and operates on capacitor start controller. I have a 28 ft round semi in-ground pool. A residential pool pump uses a standard electric motor, which is usually between 1/2 hp up to and including 3 hp. Pool pumps may have two capacitors, one in the back (the start capacitor) and one on top (the run capacitor). Pool Pumps Service Sharper Image Pools Tampa Bay. The start controller or centrifugal switch is defective and not disconnecting the capacitor when the motor comes up to speed. 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. Pump is recently new as is control switch/head bleed valve. In searching for a solution I have found this: Here is a guide on "How To Replace AO Smith Motor Parts - Overview" that shows you what electrical parts may be involved. Pool pumps are supposed to be completely airtight: this is what keeps them primed and sucking water properly. 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. 2. 86: Why is my pool pump motor capacitor failing? Replaced with same and blew immediately. The higher the capacitance of the capacitor the more energy it can store. 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. From electrical theory we know that 1 hp is equal to 746 watts of power. A motor starting capacitor is a non-polarized electrolytic capacitor that is rated for motor starting duty. 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. 99. The replacement capacitor is not a motor starting type capacitor of the proper voltage rating. 1. 3. I have a Welch Vacuum Pump which contains an Emerson 8917A motor (0.5 HP, single phase, 120V, 4.6 amps). I have an Optiflo Pentair 1.5 hp above ground pump and want to switch over to a sand filter. Try taking the motor into a pool store to see if they can test it for you. 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. Uncategorized pool pump motor keeps blowing capacitor. replaced capacitor and switch plate assbly. Motor capacitors store electrical energy for the motor to use. problem is the capacitor keeps blowing up. When the motor is close to running speed, the Start capaciotor is switched out of the winding circuits. CAPACITOR TYPES - A pool pump can have two types of capacitors: a Start capacitor and A Run Capacitor. 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. 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. A damaged or burnt out capacitor may hold only a fraction of the energy needed for the motor if its capacitance is low. Posted on November 30, 2020 by November 30, 2020 by One model of compressor motor start capacitor. Right away it's obvious that this amount of power has the potential to generate a lot of heat. After 3yrs no problems , one of the capacitors blew, motor would not start. A bad motor capacitor may cause starting problems or could shut off the motor while running. 7 thoughts on “ PSC Ep. 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