Specifications

SiUS39-601 Field Setting
Test Operation 103
3.2.8 Power Transistor Check Operation
When the inverter system malfunctions (malfunction of inverter, INV compressor), to locate where
the malfunction occurs, switching to the power transistor check mode of inverter in the service
mode setting enables not to judge the position detection signal malfunction but to output waveform
only during inverter operation. (The waveform can be checked by disconnecting the wiring of
compressor.)
After the completion of checks, return the system to the previous mode and wait for 30 seconds or
more until the discharge of capacitor is completed. Then, conduct a subsequent work.
Notes: Be sure to disconnect the compressor wiring when conducting the check operation mentioned
above.
When the output voltage is approx. 100~200 V (10 Hz) and the voltage balance between phases
U-V, V-W, W-U is within ±5%, the inverter PCB is normal.
Refer the detail power transistor check to page 215.