Inv Board - Mitsubishi Electric R410A Service Handbook

[4-2 Outdoor Unit Circuit Board Components ]
4-2-3

INV Board

(1) PUHY-P72, P96, P120, P144TLMU
F001
Fuse
250 VAC 3.15A
SC-P1
Diode rectifier
output (P)
IGBT
Back
SC-P2
Bus voltage input (P)
C011 - C016
Smoothing capacitor
Input (L3)
1) When opening or closing the front panel of the control box, do not let it come into contact with any of the internal 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 electrolytic 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.
2) Control box houses high temperature parts. Be well careful even after turning off the power source.
3) Perform the service after disconnecting the fan board connector (CNINV) and the inverter board connector (CN1 or
CNFAN). To plug or unplug connectors, check that the outdoor unit fan is not rotating and that the voltage of capac-
itor in the main circuit is 20 VDC or below. The capacitor may collect a charge and cause an electric shock when the
outdoor unit fan rotates in windy conditions. Refer to the wiring nameplate for details.
4) To connect wiring to TB7, check that the voltage is 20 VDC or below.
5) Reconnect the connector (CNINV) back to the fan board and reconnect the connector (CN1 or CNFAN) back to the inverter
board after servicing.
6) When the power is turned on, the compressor is energized even while it is not operating. Before turning on the power, discon-
nect all power supply wires from the compressor terminal block, and measure the insulation resistance of the compressor.
Check the compressor for a ground fault. If the insulation resistance is 1.0 M or below, connect all power supply wires to the
compressor and turn on the power to the outdoor unit. The liquid refrigerant in the compressor will evaporate by energizing
the compressor.
HWE14080
LED4
Lit during normal
CNFAN
CNVDC
CPU operation
Bus voltage output
Bus voltage output
N
P
P
P
N
N
SC-T
TB-P (Note 1)
TB-N (Note 1)
Bus voltage
Bus voltage
check terminal (P)
check terminal (N)
CN2
Serial signal output
GND
17VDC input
LED1
17VDC output
Inverter in normal operation (Lit)
/Error (blinking)
SC-R
SC-S
Input (L1)
Input (L2)
CT11
Current sensor (U)
- 70 -
CN4
GND (FAN board)
Serial communication signal input
SW001
ON: No-load
operation
setting
OFF: Normal
operation
setting
Set to OFF
PSH01 - 03
Overcurrent
detection
resistor
SC-V
Inverter output (V)
SC-W
Inverter output (W)
SC-U
Inverter output (U)
CT12
Current sensor (W)
GB