Dingfeng Capacitor---What We Should Know About Starting Capacitor

From: http://www.capacitorformotor.com/start_capacitor.html
publisher: Katrina Pan
Time: 2017-11-07
Dingfeng Capacitor---What We Should Know About Starting Capacitor

What is a Start Capacitor?

Designed for momentary use, the start capacitor is what lets a motor start up instantly instead of taking a long time to come up to speed before it can be used. It stays energized long enough to rapidly bring the motor to 3/4 of its full speed and is then taken out of the circuit. It will briefly increase motor starting torque and allow a motor to be cycled on and off rapidly, but is not meant to be used for more than a few seconds.

What exactly does it do?

Single phase motors will commonly have both a start and run capacitor. The difference between the two is that the start capacitor has a much higher ability to store charge, also known as its capacitance rating, for its size than that of therun capacitor. Essentially, the start cap gives the motor a bolt of energy in order to get it up and running, while the run capacitor keeps the motor going after the start capacitor shuts down.


How do I select the correct Start Capacitor?

Most electric motor start capacitors will come with similar specs.


Voltage – 110/125, 165, 220/250 or 330 VAC

Frequency – 50 or 60 Hz

Capacitance – 50 to 1200 UF


It is important to note that when choosing a replacement capacitor, you should always select one with the same capacitance and frequency as the original. In terms of voltage, you can choose a new capacitor with a voltage that is higher or lower than the original but it must still be higher than the operational voltage of the motor for it to work. The start capacitor can usually be identified by their black phenolic or plastic case and a recessed top where the connections are located.


What else should I know about Start Capacitors before I buy one?

Since a start capacitor is designed to give a quick burst of energy, it can sometimes burn out. There are two easily identifiable signs that the start capacitor is not functioning normally: if your motor is either not turning on at all, or is slow to start.


If the motor is simply slow to start, your start capacitor may have lost its capacitance rating due to wear and age. It is also possible in this case that you may have other issues with your motor unrelated to the capacitor, but replacing a start capacitor is relatively cheap, so it is a good place to start.


In more serious cases, the motor's starting circuit might be engaged too long for the intermittent duty rating of the start capacitor. The top of the start capacitor may become dislodged, and the insides may, in some cases, be partially or fully ejected. If start capacitors are left energized too long due to a faulty starting circuit on a motor they can overheat. Similarly, but not quite as dramatic, a start capacitor may just exhibit a ruptured pressure relief blister. If any of these do occur, and damage the capacitor, it must simply be replaced.


start capacitor CD60 220Vstartingcapacitor CD60 350uf



As the top three capacitor manufacturers in Wengling, we have engaged in producing capacitor for over 28 years and we are trying to be better.We believe one day Dingfeng Capacitor will exist in every corner of the world by means of its reliable quality and good reputation. By the way, Dingfeng sincerely welcome all the friend to visit our company and hopes to have a good communication and double-win partnership with all of you cause Dingfeng capacitor is always on the way to be better! Your views are the driving forces of Dingfeng! I hereby on behalf of all the members of Dingfeng, thank all of you for the long-term supporting and concerning of our growth.

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