Check
SiBE041010EA
89
Service Diagnosis
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
Connect an inverter analyzer in place of the 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 the
output side of the PCB. (Do not connect the wires 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 with the remote controller.
(1) Turn the system on.
(2) Select FAN operation with the [MODE] button on the remote controller.
(3) Press the center of the [TEMP] button and the [MODE] button at the same time.
→
00
is displayed with the figure of ten's place blinking.
(4) Press the [MODE] button.
→
00
is displayed with the figure of one's place blinking.
(5) Press the [MODE] button.
→
T
is displayed.
(6) Press the [ON/OFF] button.
→
Power transistor test operation starts.
(R18322)
(1) Remove the terminals from
the compressor.
(2) Connect the terminals to the
inverter analyzer.
Compressor
Inverter analyzer
Be careful not to let the terminals (U,V,W)
touch each other. Otherwise, high voltage
is applied.
