Gree GMV MTAC VRF Series, Service Manual

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Gree GMV MTAC VRF for North America
98
3 Power Distribution of Unit
3.1 Power Distribution of Unit
The control logical relationship among parts inside the electric box of unit is showed by the
mongline diagram (CAD source file).
The main loop is showed by bold line (line width: 1mm); the control loop is showed by slim line
(line width: 0.2mm).
Power wiring
board
Filter plate Drive board Compressor
Main control board
Temperature sensor, electric
expansion valve, high pressure and
low pressure switch and so on
4-way valve, by-pass valve,
electric heating belt and control
signal
Fan
(Bold line is the power line and the slim line is the control line)
3.2 Main Electric Parts
Name Photo Function introduction
Filter plate
It main effect is to eliminate the interference
of power for protecting unit’s
anti-interference capability and prevent the
interference to other electric appliances.
IPM Module
There are three complemental IGBT tube
inside the IPM module. They are controlled
by PWM wave and then bring the pressure
of DC bus bar to different stator windings of
compressor at different stage, and then
generate current on the stator. Meanwhile,
magnetic field will be generated on the
stator winding, and push the operation of
rotor and then drive compressor to operate.
PFC module
Four diodes and two MOS pipe are
intergrated inside the PFC module. It will
transform AC input power into DC power.
Meanwhile, MOS pipe is controlled by PWM
wave. Pressure will be increased by
induction.