Daikin VRV S RXQ4/5ARV1 Service Manual page 144

Field Settings for Outdoor Unit (6/8 HP Models)
RXMQ6AR
Disconnect U/V/W from compressor before
performing the power transistor check.
Power transistor check
mode activate;
Mode 2-28 set 0 1
Check 1
Check 1: AC power input (L, N on X1M: power supply terminal block) around 220 V
Check 2: DC voltage on inverter circuit capacitor (C+,C–) increases to around 310 V.
Check 3: VDC = 1.42 × VAC power supply (calculation from Check 1 and Check 2)
Check 4: AC U/V/W 10 rps intermediate (at fasten U/V/W) around 10 V
Check 5: DC voltage drop (discharge inverter circuit capacitor DC) check difference between "C+, C–" within 2
LED (V phase) brightness reduce till off.
*Note: Actual voltage value depends on meter characteristics.
138
 Wait until 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:
 Line (for RXMQ6AR) or all 3 phases (for RXMQ8AR) and neutral are available, and
 Inverter circuit is active. Check if the green LED "HBP" on the main PCB (for
RXMQ6AR) or "HAP" on the inverter PCB (for RXMQ8AR) is blinking normally
(approximately 1/second). If LED is OFF, need to exit the "standby mode" of the
inverter:
 Disconnect and reconnect power supply control PCB, or
 Forced thermostat ON condition, or
 Make shortly set 2-6-1 (forced thermostat ON indoor), or
 2-20-1 (manual refrigerant charge).
 Once the LED is blinking on the PCB, change related setting immediately back to set
0 to deactivate related function.
 Diode module generates the required 300 VDC (for RXMQ6AR) or 500 VDC (for
RXMQ8AR).
 Cautions:
 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.
 Below time graphs show the different steps during the power transistor check mode.
 Switching sequence during power transistor check mode:
Check 2 Check 3
VAC VDC VDC =
1.42 × VAC
L/N C+/C–
Power transistor check
mode activate;
Mode 2-28 set 1 0
VAC [U/V/W]
Frequency 10 rps
Check 4
VAC
U/V/W
SiAF332111E
Power supply
OFF
VDC [C+/C–]
(310 VAC)
About 6 minutes
Check 5
VDC
C+/C–
Part 5 Field Settings and Test Operation
60 VAC
Time