There is a page on this site that explains how to do that and provides further information about compressor motor capacitors if you are interested. If you’ve worked through the reasons for the compressor starting and stopping with no relief as yet, it’s time to check the capacitors. What the capacitors do is give the motor an electrical boost when it’s starting, and ongoing power support when it’s running, if that compressor motor has a run capacitor as well. Your compressor motor may have one or two capacitors, depending on whether that motor has a start, a run, or a combination capacitor. These capacitors are normally located on the exterior of the compressor motor. Testing Capacitors Air Compressor Start Capacitor There is another compressor component that could cause the compressor to start and stop, and that is that the start or run capacitor is failing. This being the case, you need an air compressor with greater air delivery capacity. If you need an air compressor to run for continuous periods on a frequent basis, it may be that the tool demand exceeds the capacity of the compressor, it runs too long, and goes off on thermal cut out. If you are using your compressor for extended periods, and the compressor starts and stops on it’s own, try running if for 10-15 minutes and then letting it cool for that same amount of time. Even smaller air compressors that claim a 100% duty cycle – and you might infer from that that you can run them continuously – are generally not supposed to run that long.
Simple steps that can help prevent a compressor motor overheating are:: This cycle of heating and cooling of the motor is a frequent cause of a compressor starting and stopping. Once the motor has cooled, if the power is on and the tank pressure is below cut in, the compressor will start again. This device will cut the power before heat-related damage can occur to the motor. Most compressor motors will have a thermal cut-out via an air compressor thermal overload switch. It is possible that the compressor motor is overheating. Power is going to motor but still the compressor starts and stops! If your compressor stops at 120 PSI, for example, it would typically start around the 90 PSI tank pressure level. The range of pressure between the air compressor stopping and then starting is in the 20 – 30 PSI area. When compressed air is used and when the tank pressure reaches a certain lower pressure called the cut-in pressure setting, the pressure switch trips to on, and the air compressor should start. If you are not sure what that is, scroll down the sitemap page to find pages of information about what the compressor pressure switch is and does.īriefly, the compressor pressure switch trips off when the tank pressure reaches a certain pressure level, known as the cut-out pressure, and the compressor should stop.
That process is controlled by the compressor pressure switch. The air compressor is supposed to start and stop periodically, of course. On this page, we’ll examine the common causes to figure out why, when your air compressor starts and stops too often, you can zero in on the cause and correct it.
Unfortunately, when an air compressor starts and stops too frequently, there could be a number of issues at fault. Hey! This site is reader-supported and we earn commissions if you purchase products from retailers after clicking on a link from our site.
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