Mitsubishi Electric PUHY-M200YNW-A1 Service Handbook page 102

[4-2 Outdoor Unit Circuit Board Components ]
(3) PUHY-(E)M500YNW-A1
CN-P, CN-N
Connects to
connector RYPN
C100-C109
Smoothing capacitor
CNRY
LED102
12 VDC
Lit: Relay drive power
GND
is supplied.
(Power-supply
Unlit: Relay drive power
board)
is not supplied.
CNCTIA
DC current sensor output
(CT-3)
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 voltage across pins 1 and 5 of connector RYPN has dropped to 20 VDC or less. It takes about 10 minutes to discharge
electricity after the power supply is turned off.
2) A Faston terminal on the inrush current resistor has a locking function. Make sure the cable heads are securely locked in
place. Press the tab on the terminals to remove them.
3) Control box houses high temperature parts. Be well careful even after turning off the power source.
4) Perform the service after disconnecting the relay connector (RYFAN1, RYFAN2). Before plugging in or unplugging
connectors, check that the outdoor unit fan is not rotating and that the voltage across pins 1 and 5 of connector
RYPN is 20 VDC or less. 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.
5) After servicing, reconnect the relay connector (RYFAN1, RYFAN2) of the fan as it was.
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 MΩ or above, 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.
BS_04_E
LED1
Lit: Inverter operation
R127
Blinking: Inverter error
Overcurrent
LED4
detection
Lit: Microcomputer is energized.
resistor
Unlit: Microcomputer is not energized.
IGBT (rear)
SC-L1
Input (L1)
CT-3
Current sensor
(Direct bus current) SC-L2
Input (L2)
SC-L
Bus voltage output (P)
CNCTIB
DC current sensor input
(CT-3)
SC-U
SC-L3
Inverter output (U)
Input (L3)
SC-B
Bus voltage output (P)
CN2
Serial communication signal
Signal input
GND (MAIN circuit board)
Signal output
GND (MAIN circuit board)
CN19V
18 VDC
GND
CNTH
DCL temperature
thermistor input
CNCT2
Connects to ACCT
with lead wire
SC-W
Inverter output (W)
F1
250 VAC fuse
3.15 A
SC-V
Inverter output (V)
11
chapter 4 -