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MXZ MICROPROCESSOR CONTROL
20
3
3-1. INVERTER SYSTEM CONTROL
MXZ-2A20NA
MXZ-3A30NA
SYMBOL
IPM
CB1~3
CT1~2
CT61
L
PFC
R64A, R64B
X64
NAME
INTELLIGENT POWER MODULE
SMOOTHING CAPACITOR
CURRENT TRANSFORMER
CURRENT TRANSFORMER
REACTOR
POWER FACTOR CONTROLLER
CURRENT-LIMITING RESISTOR
RELAY
FUNCTION
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.
Function of main parts
W
MC
V
U
W
V
U
IPM
CB3
CB2
+CB1
PFC
CT61
N/F
CT2
CT1
X64
R64A/R64B
L
POWER
SUPPLY
POWER BOARD
P. C. BOARD
FILTERNOISE
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.
3-1-1. Inverter main power supply circuit
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