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3-2 CIRCUIT DISCRIPTION
3-2-1 Filter PCB
1. Varistor
When an abnormal voltage is applied between the terminal of varistor (VA101),
it shorts out and the circuit protection is carried out.
2. Noise Filter
A lot of different kinds of pulse noise come out of inverter since it Controls transistors by switching.
Noise filter protects these noises to come out of inverter by absorbing the noise with the coil and
bypassing the high harmonic frequency with capacitor.
3-2-2 Current Transformer
It is the circuit which always detects the input current. The compared value to 5 V standard voltage is
input to the MICON and detects CT error so that the supplied current to the circuit does not exceed the setup value.
(Total current value decrease of the outdoor unit is detected during the compressor operation.)
3-2-3 Power Relay & Resistor
They control the serge current when turning on outdoor unit power,
and they prevent destruction of the parts from the serge current.
3-2-4 Coil (Reactor)
It conditions the current waveform and removes the noise.
3-2-5 Smoothing Capacitor
This is used to remove the ripple of DC voltage that is output from the converter.
3-2-6 IGBT (Insulated Gate Bipolar Transistor)
1. Converter (3-phase)
It conducts the full-wave rectification of the AC voltage that passed through the noise filter.
2. IGBT
It is composed of 6 transistors and drives the motor by high speed switching.
The drive voltage signal is transferred to the drive circuit from MICON,
and varies the supply frequency to the motor (PWM system) to rotate the motor.
3. Thermistor
It detects the temperature rise of Heatsink and prevents the electronic parts
from a breakage by an excessive temperature rise.
03-03
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Table of Contents
Troubleshooting
