Check SiMT041311E185 Service Diagnosis3.8 Inverter Analyser CheckCheck No.15 CharacteristicsInverter analyser: RSUK0917CIf an abnormal stop occurs due to compressor startup failure or overcurrent output when usingan inverter unit, it is difficult to judge whether the stop is caused by the compressor failure orsome other failure (main PCB, power module, etc.). The inverter analyser makes it possible tojudge the cause of trouble easily and securely. (Connect an inverter analyser as a quasi-compressor instead of compressor and check the output of the inverter) Operation MethodStep 1Be sure to turn the power off.Step 2Install an inverter analyser instead of a compressor.Note:Make sure the charged voltage of the built-in smoothing electrolytic capacitor drops to 10VDC or below before carrying out the service work.Reference:If the terminals of the compressor are not FASTON terminals (difficult to remove the wire onthe terminals), it is possible to connect wires available on site to the outdoor unit from outputside of PCB. (Do not connect them to the compressor at the same time, otherwise it mayresult in incorrect detection.)Step 3Activate power transistor test operation from indoor unit.(1) Turn the power on.(2) Open the cover of the remote controller.(3) Press the SET UP button for 5 seconds.(4) Press the T or S button and select Test mode.(5) Press the APPLY button.→ is displayed.(6) Press the FAN ONLY button.→ Power transistor test operation starts.(R20472)(1) Remove the terminals fromthe compressor.(2) Connect the terminals to theterminals of the inverteranalyser.CompressorInverter analyserBe careful not to let the terminals (U,V,W)touch each other. Otherwise, high voltageis applied.
