Mxz Microprocessor Control; Mxz-2A40Va; Mxz-3A54Va; Mxz-4A71Va - Mitsubishi Electric MSC-CA20VB Service Technical Manual

12

MXZ MICROPROCESSOR CONTROL

MXZ-2A30VA MXZ-2A52VA MXZ-4A71VA MXZ-5A100
MXZ-2A40VA MXZ-3A54VA MXZ-4A80VA

12-1. INVERTER SYSTEM CONTROL

12-1-1. Inverter main power supply circuit
MXZ-2A30/40/52VA
POWER P.C. BOARD
L61
Power
supply
Function of main parts
SYMBOL
IPM INTELLIGENT POWER MODULE
C63A/C63B/C63C
SMOOTHING CAPACITOR
CT761/CT781 CURRENT TRANSFORMER
CT61
CURRENT TRANSFORMER
DB61 DIODE MODULE
R64A, R64B
CURRENT-LIMITING RESISTOR
X64 RELAY
DB65 DIODE MODULE
TR821 SWITCHING POWER TRANSISTOR
L64 REACTOR

MXZ-3A54VA

MXZ-4A71/80VA
MXZ-5A100VA
NOISE
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
X64
CT61
L62
R64A R64B
NAME
FILTER P. C. BOARD
R64A/R64B
X64
CT61
NAME
INVERTER P.C. BOARD
L64
DB61
C63A
+
C63B
C63C
TR821
DB65
Booster chopper circucuit
It supplies three-phase AC power to compressor.
It stabilizes the DC voltage.
It measures the current of the compressor motor.
It measures the value of current which is supplied to the main power
supply circuit.
It converts the AC voltage to DC voltage.
It absorbs the rush current not to run into the main power supply circuit
when the electricity turns ON.
It short-circuits the resistance which restricts rush current during the
normal operation after the compressor startup.
Booster
It improves power factor.
chopper
It rectifies AC and controls its voltage.
circuit
POWER BOARD
L
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.
150
U
P
W
CT761
V
N MC
W
CT781
IPM
FUNCTION
V
MC
CT1
U
U
+CB1
CB2
CB3
IPM
V
CT2
W
FUNCTION
U
V
W