Mitsubishi Electric CAHV-R450YA-HPB Service Manual page 58

[ III Unit Components ]
4. Fan board
CN107
DC current sensor output
CNINV1
Inverter output
1 W
4
V
7 U
CNINV2
Inverter output
1 W
4 V
U
7
When opening or closing the front panel of the control box, do not let it come into contact with any of the internal
1)
components.
Before inspecting the inside of the control box, turn off the power, keep the unit off for at least 10 minutes, and
confirm that the capacitor voltage (inverter main circuit) has dropped to 20 VDC or less. It takes about 10 minutes
to discharge electricity after the power supply is turned off.
Control box houses high temperature parts. Be well careful even after turning off the power source.
2)
Perform the service after disconnecting the connector (CNINV1, CNINV2) on the fan board. Before plugging in
3)
or unplugging connectors, check that the outdoor unit fan is not rotating and that the voltage across CN-P and
CN-N on the INV board is 20 VDC or less.
The capacitor may collect a charge and cause an electric shock when the outdoor unit fan rotates in windy con-
ditions. Refer to the wiring nameplate for details.
To connect wiring to TB7, check that the voltage is 20 VDC or below.
4)
After servicing, reconnect the connector (CNINV1, CNINV2) on the fan board as it was.
5)
HWE22020
CNDCP
Bus voltage input(P)
RSH086, RSH087
Current detection resistor
F001 CN108
15A 400V fuse DC current sensor output
CNDCN
Bus voltage input(N)
CN080
1 Serial communication signal input
GND (Control board)
2
Serial communication signal output
3
4
GND (Control board)
- 49 -
LED1
Lit: Inverter operation
Blinking: Inverter error
LED4
Lit: Microcomputer is energized
Unlit: Microcomputer is not energized
CN106
16VDC input
1
GND
2
CN101
16VDC input
1
GND
2
SW001
1 ON:No-load operation
2 OFF: Normal operation
Address switch
3
Address switch
4
GB