Capacitor Board (Cap Board) - Mitsubishi Electric PUHY-HP72 Service Handbook

[4-2 Outdoor Unit Circuit Board Components ]
4-2-6

Capacitor Board (CAP Board)

(1) TNU
SC-N
Bus voltage input (N)
Connects to INV38
SC-D1
Connects to INV38
SC-D2
Connects to INV38
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 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) 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.
12 -
chapter 4
SC-PL
SC-P1L
Bus voltage input (P)
Bus voltage input (P)
Connects to INV38
Connects to INV38
CNRY
Connects to
connector CNRYA
CNRY2
Connects to
connector CNRY
SC-P1C
Bus voltage input (P)
Connects to INV38
CN-P
Connects to connector RYPN
CN-N
Connects to connector RYPN
C1-C7
Smoothing capacitor
HWE18240_GB