Daikin VRV EMERION RXYQ-AATJA Service Manual page 206

Field Setting from Outdoor Unit
[2-28]:
199
Power transistor check mode
To evaluate the output of the power transistors. Use this function in case error code is
displayed related to defective inverter PCB or compressor is locked.
Default value: 0. Power transistor check mode is not active.
Field setting 1: Power transistor check mode is active.
Function:
 Inverter PCB gives output of 10 Hz in sequence by all 6 transistors. Remove the
U/V/W terminals of the compressor, and connect to the inverter checker module. If all 6
LEDs blink, the transistors switch correctly.
 When the power transistor check mode is interrupted, after internal power circuit is
disconnected on the inverter PCB, 2 LEDs will light up to indicate discharge of the DC
voltage. Wait till the LEDs are OFF before returning fasten terminals back to the
compressor terminals.
Minimum requirements to refer to the result on the inverter checker module:
 All 3 phases and neutral are available, and
 Inverter PCB control is active. Check if the green LED "HAP" on the inverter PCBs are
blinking normal (approx. 1/second). If LEDs are OFF, need to exit the "standby mode" of
the inverter:
 Disconnect and reconnect power supply control PCB, or
 Forced thermostat ON condition, or
 Briefly set 2-6-1 (forced thermostat ON indoor), or 2-20-1 (manual refrigerant charge).
 Once the LED is blinking on the inverter PCB, change related setting immediately
back to set 0 to deactivate related function.
 Diode module generates the required 260 VDC for RXYQ-AATJ* or 600 VDC for
RXYQ-AAYD*.
Cautions:
 In case there is more than 1 compressor in a system (outdoor is multi outdoor
configuration), all compressor inverter PCBs will perform the power transistor check. In
such case, disconnect U/V/W fasten terminals on all compressors. Avoid accidental
touch of fasten terminals to short circuit or ground leak to casing.
 To stop the power transistor check mode, change setting to default 2-28-0.
 Output to U/V/W will also stop when outdoor unit main PCB decides standby mode of
inverter circuit.
SiUS342303E
Part 5 Field Settings and Test Operation