INVERTER CHECKER 1. Safety precautions 2
Contents
1. Inverter Checker MITSUBISHI ELECTRIC Changes for the Better INVERTER CHECKER OPERATION MANUAL FOR USER For safe and correct use read this operation manual thoroughly before operating Inverter checker is a tool to help your troubleshooting when compressor is inoperative Connecting it to Mitsubishi Electric Air Conditioner outdoor unit identifies output faults from power board and power module driving compressor You can use this tool to identify inverter faults when problem arises such as compressor overcurrent protection 1 Safety precautions CAUTION HIGH VOLTAGE Clips and Compressor Terminals HIGH TEMPERATURE Resistors HIGH VOLTAGE WARNING Clips and compressor terminals are at high voltage Prior to working with inverter checker cut off the power supply and wait for more than 5 minutes to complete discharging Do not touch inverter checker with wet hands Do not connect power Line L1 L2 L3 N with inverter checker Do not use inverter checker for more than 10 minutes continuously The tool will be over heated Do not modify the inverter checker Do not remove protective cover on inverter checker Resistors on inverter checker become extremely hot Failure to do so may result in burns 2 Installing the inverter checker 2 1 Parts Check part names as figure 2 1 below Clip LED Fig 2 1 Part names 1 4 Inverter Checker 2 2 How to connect the inverter checker 2 2 1 Cautions before conn2. ecting the inverter checker Power board and power module are at high voltage For safety please observe and follow the service manual of the outdoor unit you are working with Cut off the power supply while connecting inverter checker Failure to do so may result in electric shock Discharge electricity completely prior to disconnecting inverter checker Failure to do so may result in electric shock To discharge cut off the power supply and wait for more than 5 minutes to complete discharging Capacitors on power board are high voltage device Just cutting off the power supply does not complete discharging Make sure to leave for more than 5 minutes 2 2 2 Connecting inverter checker 1 Cut off the power supply 2 Wait for more than 5 minutes to complete discharging power board 3 Before connecting inverter checker measure voltage of compressor terminal U V W or compressor connecting terminals U V W on power board with tester locally procured to make sure discharging is complete 4 Connect inverter checker Connecting method differs in type of compressor terminal 4 1 TAB type terminal Disconnect compressor wirings from compressor and clip on each terminal To prevent short circuit between phases cover the clip with insulation tape Fig 2 2 TAB type Fig 2 3 TAB Fig 2 4 Clip coved with insulation tape 4 2 Screw type terminal Disconnect compressor wirings from compressor and clip on each terminal To pre
3. t use switches on control PCB for model setting Incorrect service control PCB installed in the unit while control PCB replacement at service Incorrect service power module installed in the unit while power module replacement at service When power supply voltage is lowering 3 4 Inverter Checker 5 2 Inverter output is faulty when LEDs do not light light unevenly or significantly dim Check for any abnormality in power board and wiring between power board and compressor Fig 2 12 LED indication when V phase is open Fig 2 13 Example of LEDs indication at open failure of arm on V phase of power module 6 When finishing the diagnosis cut off the power supply and wait for more than 5 minutes to complete discharging capacitor on power board Then disconnect the inverter checker 4 4
4. terminals U earth V earth W earth If short circuit is found it is an earth fault So replace the compressor Make sure to conduct troubleshooting of inverter 2 Check inverter output status with inverter checker 3 Connect power supply 4 Start cooling or heating operation Note1 While operation is OFF output status is not shown properly Depending on outdoor unit models unordinary output from the compressor may be detected due to compressor protection control Thus do not conclude your fault identification at this stage Fig 2 10 Example of LED indication in compressor protection control Do not conclude your fault identification at this stage Note2 We recommend the operation in test run mode since the operation is not influenced by indoor set temperature and room temperature so that identifying fault becomes easier 5 Check 6 LEDs lighting condition on inverter checker 5 1 Inverter output is fine when 6 LEDs light evenly Therefore please check for compressor and refrigerant circuit fault Fig 2 11 LED indication at normal inverter output Note In the following cases even 6 LEDs light evenly overcurrent failure will occur when connecting wiring to compressor So please check setting of power board and control PCB and wiring Mistake in compressor wiring Output of power board is normal but compressor overcurrent protection will be detected Incorrect model setting on control PCB applicable to models tha
5. vent short circuit between phases cover the clip with insulation tape Fig 2 5 Ring type Fig 2 6 Ring Fig 2 7 Clip covered with insulation tape 4 3 Cluster type terminal Three wire connector Disconnect wirings of clip connecting side from connector of inverter checker In cluster type terminal connector is used to joint compressor wiring and power board Disconnect compressor wiring from the connector and connect compressor wiring to the connector of inverter checker Power board Fig2 8 CLUSTER type Inverter Checker Fig2 9 Cluster type terminal connecting method 2 4 Inverter Checker 2 3 Identifying fault 2 3 1 Cautions before identifying fault Never touch the terminals Terminals have high voltage Failure to do so may result in electric shock Never touch the terminals with wet hands Failure to do so may result in electric shock Do not use inverter checker over 10 minutes continuously Resistors on the inverter checker will get extremely hot 2 3 2 How to identify fault 1 Disconnect compressor wirings and measure resistance values to check for short circuit or earth fault Measure resistance value between compressor terminals U V V W U W to check for short circuit If short circuit is found please replace the compressor Make sure to conduct troubleshooting of inverter Make sure to conduct below inverter output status check Measure resistance value between compressor terminals and earth
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