LED
U
V
W
LED1
LED3
LED5
LED2
LED4
LED6
LED1
LED3
LED5
LED2
LED4
LED6
LED1
LED3
LED5
LED2
LED4
LED6
LED1
LED3
LED5
LED2
LED4
LED6
LED1
LED3
LED5
LED2
LED4
LED6
LED1
LED3
LED5
LED2
LED4
LED6
ON/OFF
status of LED
If all of LED are ON/OFF
according to following pattern
If all of LED stay OFF or
some of LED are ON/OFF
Control PCB Normal Anomalous
15 sec.
5sec.5sec.
5sec.
During this period, ON/OFF status of LED is
repeated cyclically according to following pattern
Power ON or start check operation
1 2 3 10
Cyclically
● ON
○ OFF
Red
Black
White
Faston terminal
〈Inverter Checker〉
Connect to the terminal of the wires which are disconnected from compressor.
LED ON/OFF pattern
(i) Setup procedure of checker.
1) Power OFF (Turn off the breaker).
2) Remove the terminal cover of compressor and disconnect the wires (U, V, W) from compressor.
3) Connect the wires U (Red) , V (White) and W (Black) of checker to the terminal of disconnected wires (U, V, W)
from compressor respectively.
4) Connect the short connector to CNROM on the main PCB.
(ii) Operation for judgment.
1) Power ON.
2) After 15 seconds since power has turned ON. LED start ON/OFF for 5 seconds cyclically and it repeats 10 times.
3) Check ON/OFF status of 6 LED's on the checker.
4) Judge the PCB by ON/OFF status of 6 LED's on the checker.
5) Be sure to disconnect the connector from CNROM, after finishing the check operation.
LED0
5V
5V 5V
32
31
1
8
MAIN PCB
CNROM
CPU
Short connector
(8) Inverter checker for diagnosis of inverter output
●
Checking method
'22 • PAC-SM-412
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53
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