Mitsubishi Electric MSZ-G09SV Service Manual page 59

Symbol
C61 POWER-FACTOR CAPACITOR
C62 SMOOTHING CAPACITOR
CT61 CURRENT TRANSFORMER
DS61 DIODE STACK
DS62 DIODE STACK
IPM INTELLIGENT POWER MODULE
L REACTOR
L61 COMMON MODE CHOKE COIL
L62 COMMON MODE CHOKE COIL
R61, R62 CURRENT-DETECTING RESISTOR
R64A
CURRENT-LIMITING RESISTOR
R64B
X64 RELAY
9-23. Operational frequency control of outdoor unit
1. Outline
The operational frequency is as following:
First, the target operational frequency is set based on the difference between the room temperature and the set temper-
ature.
Second, the target operational frequency is regulated by discharge temperature protection, high pressure protection,
electric current protection and overload protection and also by the maximum/minimum frequency.
Maximum/minimum frequency in each operation mode.
COOL
Minimum Maximum
frequency frequency
15
w The maximum frequency in COOL mode varies according to operation hours as shown below.
w However, it is under rating frequency when indoor fan speed is set to MANUAL Low or AUTO Low.
Maximum
frequency
Frequency
1Hr
2. Control by the difference between the room temperature and the set temperature
The frequency is controlled by the difference between the room temperature and the set temperature.
(1) Frequency when the unit starts operation
Name
It improves the power factor of power supply.
It stabilizes the direct current voltage.
It measures the current of main power supply circuit.
It converts the alternating current voltage to direct current voltage.
It is combined with L to improve the power factor of power supply.
It generates three-phase alternating current and operates compressor.
It is combined with DS62 to improve the power factor of power supply.
It eliminates and absorbs the electrical noise.
It eliminates and absorbs the electrical noise.
It detects the current and protects the compressor and IPM.
It absorbs the rush current so not to run into the main power supply
circuit when the electricity is turned on.
It short-circuits the circuit to current-limiting resistor when the
compressor operates.
HEAT
Minimum
frequency
120 15
Rating or under rating frequency
Time: T
DRY
Maximum
frequency
120 84
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Function