Toshiba RAS-3M26U2AVG-E Service Manual page 34

8-1. Outdoor Unit (Inverter Assembly)
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.
Noise filter
Input current
sensor
High power factor
correction circuit
Converter
(AC → DC)
Inverter Gate drive
(DC → AC)
circuit
Output current
sensor
Compressor
8. CONTROL BLOCK DIAGRAM
Suction temp. sensor
M.C.U
• 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
Signal communication
M.C.U 1
• 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.
Inverter
(DC → AC)
Output current
sensor
Outdoor
fan motor
- 34 -
FILE NO. SVM-18051
Evaporator temp. sensor
WP-041 (CONTROL P.C. B)
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
Gate drive
circuit
P.M.V : Pulse motor valve
PWM : Pulse width modulation
IPM : Intelligent power module
Discharge temp. sensor
A unit serial signal
communication circuit
B unit serial signal
communication circuit
C unit serial signal
communication circuit
~
220–240V 50Hz
~
220V 60Hz
Relay circuit
Clock frequency
oscillator circuit
20 MHz
4-way valve