Inverter Checker" Check - Daikin CTXU25G2V1B Service Manual

Check
3.8

"Inverter Checker" Check

Check No.14 1. Characteristics
If abnormal stop occurs due to compressor startup failure or overcurrent output when using
inverter unit, it is difficult to judge whether it is caused by the compressor failure or other failure
(control PCB, power transistor, etc.). The inverter analyzer makes it possible to judge the cause
of trouble easily and securely. (Connect this analyzer as a quasi-compressor instead of
compressor and check the output of inverter)
2. Operation Method
1) Be sure to turn the power off.
2) Install the 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 connector terminal of compressor is not a FASTON terminal (difficult to remove the wire
on the terminal), it is possible to connect a wire available on site to the unit from output side of
PCB. (Do not connect it to the compressor at the same time, otherwise it may result in incorrect
detection.)
1) Turn the power on.
2) Press the 3 buttons (TEMP ▲ , TEMP ▼ , MODE) on the remote controller simultaneously.
3) Press TEMP ▲ or ▼ button and select T .
4) Press the MODE button to enter the trial operation mode.
5) Press the MODE button and select FAN mode.
6) Press the ON/OFF button to start inverter test.
173
(1) Remove the FASTON
terminals from the terminal
block of the compressor.
Compressor
How to activate inverter test mode
(2) Connect the FASTON
terminals to the terminals of
the inverter analyzer.
Be careful not to touch the terminals
(U,V,W) each other. Otherwise, high
voltage is applied.
SiBE12-908
Inverter analyzer
(R5160)
Service Diagnosis