Mitsubishi Electric FDT125VNVF Technical Manual page 354

(7) Inverter checker for diagnosis of inverter output
●Checking method
(a) 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.
(b) Operation for judgment.
1) Power ON after JSW10-4 on outdoor inverter PCB was turned ON. (In case of FDC100-140)
* In case of FDC200VS and 250VS, Start test operation on cooling or heating mode after power ON.
2) After 15 seconds since power has turned ON (or In case of FDC200VS, 250VS after the test operation started),
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.
ON/OFF
status of LED according to following pattern
Inverter PCB
Power ON or start check operation
15 sec.
5) Be sure to turn off JSW10-4 on outdoor inverter PCB, after finishing the check operation. (In case of FDC100-140)
〈Inverter Checker〉
Faston terminal
Connect to the terminal of the wires which are disconnected from compressor.
If all of LED are ON/OFF
Normal
During this period, ON/OFF status of LED is
repeated cyclically according to following pattern
1 2 3
～
5sec. 5sec.
5sec.
LED
Red
White
U
Black
V
W
If all of LED stay OFF or
some of LED are ON/OFF
Anomalous
10
LED ON/OFF pattern
LED1 LED1
LED2 LED2
LED3 LED3
LED4 LED4
LED5 LED5
LED6 LED6
353
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'12 • PAC-T-174
LED1 LED1 LED1
LED2 LED2 LED2
LED3 LED3 LED3
LED4 LED4 LED4
LED5 LED5 LED5
LED6 LED6 LED6
Cyclically
LED1
LED2
LED3
LED4
LED5
LED6
● ON
○ OFF