Inverter Analyzer Check - Daikin FTXR-T Series Service Manual

Check
5.7

Inverter Analyzer Check

Check No.15
 Characteristics
Inverter analyzer: RSUK0917C
If an abnormal stop occurs due to compressor startup failure or overcurrent output when using an
inverter unit, it is difficult to judge whether the stop is caused by the compressor failure or some
other failure (main PCB, power module, etc.). The inverter analyzer makes it possible to judge the
cause of trouble easily and securely. Connect an inverter analyzer as a quasi-compressor instead
of compressor and check the output of the inverter.
 Operation Method
Step 1
Be sure to turn the power off.
Step 2
Install an inverter analyzer instead of a compressor.
Note:
Make sure the charged voltage of the built-in smoothing electrolytic capacitor drops to 10 VDC or
below before carrying out the service work.
Reference:
If the terminals of the compressor are not FASTON terminals (difficult to remove the wire on the
terminals), it is possible to connect wires available on site to the outdoor unit from output side of
PCB. Do not connect them to the compressor at the same time, otherwise it may result in incorrect
detection.
Step 3
Activate power transistor test operation from the indoor unit.
1. Turn the power on.
2. Select FAN operation with Mode button on the remote controller.
3. Press the center of Temp button and Mode button at the same time.
4. Select T with Temp or Temp button.
5. Press Mode button to start the power transistor test operation.
116
(1) Remove the terminals from
the compressor.
Compressor
(2) Connect the terminals to the
terminals of the inverter
analyzer.
Compressor
Be careful not to let the terminals (U,V,W)
touch each other. Otherwise, high voltage
is applied.
SiUS041829E
Inverter analyzer
(R22731)
Part 6 Service Diagnosis