Mitsumi electronic MSY-GENA User Manual

21

POWER

SUPPLY

NOISE

FILTER

CIRCUIT

RESISTOR

RELAY

SMOOTHING

CAPACITOR

CURRENT

TRANSFORMER

COMPRESSOR

REACTOR

P

W

V

U

N

INTELLIGENT

POWER MODULE

POWER FACTOR

CORRECTION

MODULE

U

W

MS

3~

V

+

NAME

FUNCTION

INTELLIGENT POWER MODULE

It supplies 3-phase AC power to compressor.

SMOOTHING CAPACITOR

It stabilizes the DC voltage and supplies it to INTELLIGENT POWER MODULE.

CURRENT TRANSFORMER

It measures the current of the compressor motor.

REACTOR

It rectifi es AC, controls its voltage and improves the power factor of power supply. 

POWER FACTOR CORRECTION MODULE 

RESISTOR

It absorbs the rush current not to run into the main power supply circuit when the 

power is turned ON.

RELAY

It keeps the RESISTOR, which restricts rush current, short-circuited while the 

compressor is operating.

Main power supply circuit is formed when RELAY is turned ON at COMPRESSOR startup.
To prevent rush current from running into the circuit when power supply is turned ON, RESISTOR is placed in sub circuit.

 When AC runs into noise fi lter P.C. board, its external noise is eliminated in NOISE FILTER CIRCUIT.
 After noise is eliminated from AC, it is rectifi ed to DC by REACTOR and POWER FACTOR CORRECTION MODULE. If the 

operating frequency becomes 25 Hz or more, DC voltage rises to 370 V.

 DC voltage, to which has AC been rectifi ed by process  , is stabilized by SMOOTHING CAPACITOR and supplied to IN-

TELLIGENT POWER MODULE.

 The DC (Bus voltage), which has been stabilized in process  , is converted to 3-phase AC by INTELLIGENT POWER 

MODULE and supplied to COMPRESSOR. 

 CURRENT TRANSFORMER, which is placed in the power supply circuit to COMPRESSOR, is used to measure the value 

of phase current and locate the polar direction of rotor with algorithm. PWM (Pulse width modulation) controls impressed 
voltage and frequency with those pieces of information.