how to check inverter ac compressor

Don't try that on these inverter compressors because you'll permanently break it. Before we talk about how these inverter compressors work and and how to troubleshoot them, let's quickly review the old skool compressors so it's fresh in our mind when we compare with how the inverter compressors work. They're like voltage checkers but with extra leads for two other voltages (phases). and should be of equal brightness, The inverter will any thoughts as to where I mis diagnosed the issue. If the start relay fails, the compressor will sit there trying but failing to start and drawing locked rotor (LR) current. making testing very difficult. Could be a bad wire harness connector, bad muthaboard, etc. Although inverter compressors do the exact same thing as the old skool compressors-- pump refrigerant vapor-- and they physically move the vapor the same way-- through a vapor-compression cycle-- they are powered and controlled very differently. Call: Now you have to check the inverter board itself. Remember how a common troubleshooting trick with the old skool compressors is to power it directly with a test cord and see if it starts? Electronic Controls for control of Inverter Air Conditioning DC Inverter Compressor. The advancement in power electronics has enabled the inverter technology to thrive by the use of microcontroller and IGBT modules to drive the compressor DC or AC motor. But if, OTOH, the winding resistances are imbalanced or one of them is open, this is diagnostically conclusive that the compressor is bad. In this case, if the MOBO really was bad, then the phase rotation tester wouldn't have shown you anything new because the inverter wasn't putting anything out apparently due to a bad PWM signal from the MOBO. so the next step I checked was the compressor and the compressor readings on all 3 pins were 9.6 ohms each so I assumed that the compressor was ok. Woburn Road Industrial Estate Here's the replacement inverter board I used to fix this refrigerator: http://www.repairclinic.com/PartDetail/Inverter-Board/WR55X11138/2443233. So, inverter compressors, unlike their old skool forebearers, really can work harder. The only thing I didn't show in the video is checking the inverter board's current draw. I checked the J15 connector at the mother board and at the connection going into the inverter board for the out going DC voltage and I was reading a fluctuating DC voltage from 4.2 to 5.6  ,  4.5 to 5.4  . Heaters  refrigeration compressors, Orion Both the amplitude (amount) and frequency of the input voltage will vary. If the meter stays at 0 amps, the inverter board is toast-- it's not even trying to start the compressor. This will be cheaper than replacing the compressor itself. [1] Measure as before Repeat for the last two phases Blue (polarity is not important) Power up and Start the unit. These are inexpensive testers that you can buy here: http://amzn.to/1huTIVJ. I will pick one up as you suggested Samurai. |  JetFlow I heard that also these inverters needed a good 20 to 25 minutes before the would energize the compressor up and run normal after replacing one and that I should try plugging the fridge back in and wait at least 25 minutes to see if the compressor will kick in. Other manufacturers may have different test schemes but the idea is the same: if the inverter is working properly, you'll see activity on your amp meter as the inverter tries to do its job. Inspecting a Home AC Compressor for Damage, {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/0\/0c\/Check-an-AC-Compressor-Step-1.jpg\/v4-460px-Check-an-AC-Compressor-Step-1.jpg","bigUrl":"\/images\/thumb\/0\/0c\/Check-an-AC-Compressor-Step-1.jpg\/aid9606691-v4-728px-Check-an-AC-Compressor-Step-1.jpg","smallWidth":460,"smallHeight":345,"bigWidth":"728","bigHeight":"546","licensing":"