Check
SiMT041311E
185
Service Diagnosis
3.8
Inverter Analyser Check
Check No.15
Characteristics
Inverter analyser: 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 analyser makes it possible to
judge 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 Method
Step 1
Be sure to turn the power off.
Step 2
Install an inverter analyser 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 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 from
the compressor.
(2) Connect the terminals to the
terminals of the inverter
analyser.
Compressor
Inverter analyser
Be careful not to let the terminals (U,V,W)
touch each other. Otherwise, high voltage
is applied.