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3
MXZ MICROPROCESSOR CONTROL
MXZ-2A20NA
MXZ-3A30NA
3-1. INVERTER SYSTEM CONTROL
3-1-1. Inverter main power supply circuit
NOISE
FILTER
POWER
N/F
SUPPLY
Function of main parts
SYMBOL
IPM
INTELLIGENT POWER MODULE
CB1~3
SMOOTHING CAPACITOR
CT1~2
CURRENT TRANSFORMER
CT61
CURRENT TRANSFORMER
L
REACTOR
PFC
POWER FACTOR CONTROLLER
R64A, R64B
CURRENT-LIMITING RESISTOR
X64
RELAY
3-1-2. Outline of main power supply circuit
1. At the start of operation
Main power supply circuit is formed when X64 (Relay) is turned ON at compressor startup.
To prevent rush current from running into the circuit when power supply is turned ON, R64A and R64B
(Current-limiting resistor) are placed in sub circuit.
2. At normal operation
1 When AC runs into noise filter P.C. board, its external noise is eliminated in the noise filter circuit.
2 After noise being eliminated from AC, it is rectified to DC by L (Reactor) and PFC (Power factor controller). If the operating
frequency becomes 25Hz or more, DC voltage rises to 370V.
3 DC voltage, to which has AC been rectified by process 2, is stabilized by CB1~3 (Smoothing capacitor) and supplied to
IPM (Intelligent power module).
4 The DC (Bus voltage), which has been stabilized in process 3, is converted to three-phase AC by IPM and supplied to
compressor.
5 CT1 and CT2 (Current Transformer), which are placed in the power supply circuit to compressor, are used to measure the
value of phase current and locate the polar direction of rotor with algorithm. PWM (Pulse width modulation) controls impre-
ssed voltage and frequency with those information.
P. C. BOARD
L
R64A/R64B
X64
CT61
NAME
POWER BOARD
+CB1
CB2
CB3
PFC
It supplies three-phase AC power to compressor.
It stabilizes the DC voltage.
It measures the current of the compressor motor.
It measures the current of the main power supply circuit.
It rectifies AC, controls its voltage and improves the power factor of
power supply.
It restricts rush current with the resistance.
It short-circuits the resistance which restricts rush current during the
compressor operates.
20
V
MC
CT1
U
W
U
IPM
V
CT2
W
FUNCTION
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