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8-2. Outdoor Unit (Inverter Assembly)
RAS-3M26UAV-E
Outdoor air temp. sensor
Gas side pipe temp. sensor
Suction temp. sensor
Evaporator temp. sensor
Discharge temp. sensor
MCC-5071 (CONTROL P.C. B)
A unit serial signal
communication circuit
B unit serial signal
communication circuit
C unit serial signal
communication circuit
• Inverter outdoor frequency control
• A/D converter function
• P.M.V. control
• Processing (Temp. processing)
• Error display
• Serial signal communication with indoor unit
• Signal communication with main P.C. board
• Function select
M.C.U
Driver
circuit of
P.M.V.
Function select
Clock frequency
oscillator circuit
20 MHz
Signal communication
A unit P.M.V.
B unit P.M.V.
C unit P.M.V.
Noise filter
Input current
sensor
High power factor
correction circuit
Converter
(AC
→
DC)
Inverter
(DC
→
AC)
Gate drive
circuit
Output current
sensor
Compressor
Outdoor
fan motor
Output current
sensor
Inverter
(DC
→
AC)
Gate drive
circuit
• PWM synthesis function
• Input current release control
• IPM over current detect control
• High power factor correction control
• Signal communication with
control P.C. board
• Fan motor control
• Compressor motor control
M.C.U 1
Clock frequency
oscillator circuit
8 MHz
Clock frequency
oscillator circuit
20 MHz
Relay circuit
4-way valve
MCC-1571 (MAIN P.C. B)
• Signal communication with
control P.C. board
• 4-way valve control
M.C.U 2
220–240V ~50Hz
220V ~60Hz
P.M.V : Pulse motor valve
PWM : Pulse width modulation
IPM : Intrlligent power module