Mitsubishi Electronics MUZ-ANA, MS-AWA Inverter System Control, Muz-Fd, Function of main parts

<SWING operation>

In swing operation of ECONO COOL operation mode, the initial air flow direction is adjusted to “Horizontal”. According to the temperature of indoor coil thermistor RT12 at starting of this operation, next downward blow time is decided. Then when the downward blow has been finished, next horizontal blow time is decided.

For initial 10 minutes the swing operation is performed in table G~H for quick cooling.

Also, after 10 minutes when the difference of set temperature and room temperature is more than 3.6 °F, the swing operation is performed in table D~H for more cooling.

The air conditioner repeats the swing operation in various cycle as follows.

	Temperature of indoor	Downward blow time	Horizontal blow time
	coil thermistor (°F)	(second)	(second)
A	59 or less	2	23
B	59 to 63	5	20
C	63 to 64	8	17
D	64 to 68	11	14
E	68 to 70	14	11
F	70 to 72	17	8
G	72 to 75	20	5
H	more than 75	23	2

2-7. INVERTER SYSTEM CONTROL

2-7-1. Inverter main power supply circuit

MUZ-A09/12/15/17 MUY-A15/17

MUZ-FD

POWER SUPPLY

NOISE FILTER CIRCUIT

	DIODE				CURRENT
REACTOR					TRANSFORMER
	MODULE1		P	U	U
RESISTOR
	~ +	~	+ SMOOTHING	V	MS
	-		CAPACITOR		V 3~
				W
RELAY			N		W
			IPM
					COMPRESSOR
~ +		~	SWITCHING
DIODE	-		POWER
MODULE2			TRANSISTOR

		BOOSTER CHOPPER CIRCUIT
Function of main parts
	NAME	FUNCTION
INTELLIGENT POWER MODULE (IPM)		It supplies three-phase AC power to compressor.
SMOOTHING CAPACITOR		It stabilizes the DC voltage and supply it to IPM.
CURRENT TRANSFORMER		It measures the current of the compressor motor.
DIODE MODULE 1		It converts the AC voltage to DC voltage.
RESISTOR		It absorbs the rush current not to run into the main power supply circuit when
		the electricity turns ON.
RELAY		It short-circuits the resistance which restricts rush current during the normal
		operation after the compressor startup.
BOOSTER	DIODE MODULE 2
		It improves power factor.
CHOPPER	SWITCHING POWER TRANSISTOR
CIRCUIT		It controls the bus-bar voltage.
	REACTOR

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