Air Conditioner LAN System
OVERVIEW
The LAN system consists of auto amp., air mix door motor, mode door motor and bi-level door motor.
A configuration of these components is shown in the diagram below.
RHA439GA
SYSTEM CONSTRUCTION
A small network is constructed between the auto amplifier, air mix door motor, mode door motor and bi-level
door motor. The auto amplifier and motors are connected by data transmission lines and motor power supply
lines. The LAN network is built through the ground circuits of the three motors.
Addresses, motor opening angle signals, motor stop signals and error checking messages are all transmitted
through the data transmission lines connecting the auto amplifier and three motors.
The following functions are contained in LCUs built into the air mix door motor, the mode door motor and bi-
level door motor.
I
Address
I
Motor opening angle signals
I
Data transmission
I
Motor stop and drive decision
I
Opening angle sensor (PBR function)
I
Comparison
I
Decision (Auto amplifier indicated value and motor opening angle comparison)
RHA511GA
OPERATION
The auto amplifier receives data from each of the sensors. The amplifier sends air mix door, mode door and
bi-level opening angle data to the air mix door motor LCU, mode door motor LCU and bi-level door motor LCU.
The air mix door motor, mode door motor and bi-level door motor LCU read their respective signals accord-
ing to the address signal. Opening angle indication signals received from the auto amplifier and each of the
motor position sensors are compared by the LCUs in each motor with the existing decision and opening angles.
Subsequently, HOT/COLD, DEFROST/VENT or OPEN/CLOSE operation is selected. The new selection data
is returned to the auto amplifier.
GI
MA
EM
LC
EC
FE
AT
PD
FA
RA
BR
ST
RS
BT
EL
IDX
DESCRIPTION
HA-21