Inverter Checker" Check - Daikin SUPER MULTI NX CTXS07JVJU Service Manual

SiUS12-928_B
7.8

"Inverter Checker" Check

 Characteristics
Check No.15
If 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 (control PCB, power module, etc.). The inverter checker makes it possible to judge the
cause of trouble easily and securely. (Connect this checker as a quasi-compressor instead of the
compressor and check the output of the inverter.)
 Operation Method
Step 1
Step 2
Step 3
Activate the power transistor test operation from the outdoor unit.
Service Diagnosis
Be sure to turn the power off.
Install the inverter checker 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.
(1) Remove the terminals from
the compressor.
Compressor
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.)
1) Press the forced operation [ON/OFF] switch for 5 seconds.
(Refer to page 256 for the position.)
 Power transistor test operation starts.
(2) Connect the terminals to the
terminals of the inverter
checker.
Be careful not to let the terminals (U,V,W)
touch each other. Otherwise, high voltage
is applied.
Check
Inverter checker
(R13940)
196