Toshiba RAS-4M27S3AV-E Service Manual page 49

8-2. Outdoor Unit (Inverter Assembly)
RAS-4M27S3AV-E, -TR
Outdoor air temp. sensor Gas side pipe temp. sensor
A unit P.M.V.
B unit P.M.V.
Driver
circuit of
C unit P.M.V.
P.M.V.
D unit P.M.V.
Noise filter
Input current
sensor
High power factor
correction circuit
Converter
(AC → DC)
Inverter Gate drive
(DC → AC)
Output current
sensor
Compressor
• 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
Function select
• 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
• High pressure protective operation.
• Case thermostat operation.
circuit
Output current
Suction temp. sensor Evaporator temp. sensor
M.C.U
Clock frequency
oscillator circuit
20 MHz
Signal communication
M.C.U 1
Inverter Gate drive
(DC → AC)
circuit
sensor
Outdoor
P.M.V : Pulse motor valve
fan motor
PWM : Pulse width modulation
IPM : Intelligent power module
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FILE NO. SVM-15073
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
D unit serial signal
communication circuit
220–240V
220V
MCC-1571 (MAIN P.C. B)
M.C.U 2
• Signal communication with
control P.C. board
• 4-way valve control
Clock frequency
oscillator circuit
8 MHz
High-pressure switch
Case thermo
Relay circuit
Clock frequency
oscillator circuit
20 MHz
~
50Hz
~
60Hz
4-way valve