Inverter Checker" Check - Daikin J Series Service Manual

Check

5.12 "Inverter Checker" Check

Check No.14
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 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
compressor and check the output of inverter)
Step 1
Step 2
Step 3
20/25/35/50 class: Activate power transistor test operation from the outdoor unit.
129
Characteristics
Operation Method
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 cooling operation ON/OFF button for 5 seconds.
(Refer to page 240 for the position.)
→
Power transistor test operation starts.
(2) Connect the terminals to the
terminals of the inverter
checker.
Be careful not to touch the terminals
(U,V,W) each other. Otherwise, high
voltage is applied.
SiBE041101
Inverter checker
(R13940)
Service Diagnosis