Motor starting capacitor
1.If the meter immediately shows a very high resistance reading, in which case the capacitor has an open in the circuit.
2.If the meter remains at zero ohms and does not climb in the reading.
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bleed resistor across start cap
Potential or “voltage” starting relays are used with single-phase capacitor-start-capacitor-run motors, which need relatively high starting torque. Their main function is to assist in starting the motor.
Start capacitors are used in many home appliances, like washers, refrigerators, or air conditioners. If your appliances are humming but not starting or performing correctly, check the capacitor to see if it’s working properly. By conducting a simple test with a multimeter, you can easily tell if your capacitor is still working or if it needs to be replaced.
Run Start Capacitors HVAC Motors
There are two basic types of motor capacitors most commonly used in HVAC applications today. The run capacitor and the start capacitor. Motor capacitors are used to either increase run efficiency of the motor or to give it an initial start boost in torque to a motor. They are sometimes referred to as motor starter capacitors or power capacitors.
How to measure capacitance
Warning: A good capacitor stores an electrical charge and may remain energized after power is removed. Before touching it or taking a measurement, a) turn all power OFF, b) use your multimeter to confirm that power is OFF and c) carefully discharge the capacitor by connecting a resistor across the leads (as noted in the next paragraph). Be sure to wear appropriate personal protective equipment.
Availability By Branch
There is a multitude of different types of capacitors, they are often used differently in circuits. The all too familiar round tin can style capacitors are usually electrolytic capacitors. They are made with one or two sheets of metal, separated by a dielectric. The dielectric can be air (simplest capacitor) or other non-conductive materials. The metal plate foils, separated by the dielectric, are then rolled up similar to a fruit roll-up, and placed into the can. These work great for bulk filtering, but they are not very efficient at high frequencies.
All of this effort involved with what should be a simple task of replacing a relay wastes unnecessary time, increases labor costs, and ultimately results in higher repair costs for the consumer. Moreover, since each given motor from a manufacturer usually requires a different relay, a service technician must keep a large inventory of relays rated for many different pick-up voltages to guarantee that the right replacement relay is on hand for ready replacement. This also increases repair costs since many relays purchased and kept on hand are never even used.