YMGI
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Your Modern Green Idea
43
Communication mode of Modular DC Inverter Units
CAN bus mode is taken for communication between IDU and ODU and communication
among IDUs.
Selection and connection mode of communication material
Select communication material
If air conditioners are installed at places where there’s strong electromagnetic interference, the communication
wire of IDU and wired controller must use shielded wire and the communication wire between IDU and IDU/ODU
must use shielded twisted pair.
1. Select communication wire between IDU and wired controller
Material type
Total length of communication
line between IDU unit and wired
controller L m(ft.)
Wire size
Remarks
Light/Ordinary polyvinyl
chloride sheathed cord.
L
≤250(820-1/5)
2×AWG18~ 2×AWG16
1.
Total length of communication line
can't exceed 250m (820-1/5ft.).
2.
The cord should be Circular cord (the
cores shall be twisted together).
3.
If unit is installed in places with
intense magnetic field or strong
interference, it is necessary to use
shielded wire.
Fig. 41
2. Select communication wire between ODU and IDU
Type
Total Length L(m) of
Communication Cable
between IDU Unit and
IDU (ODU ) Unit m(ft.)
Wire size
Remarks
Light/Ordinary
polyvinyl chloride
sheathed cord.
L
≤1000(3280-5/6)
≥2×AWG18
1. If the wire diameter is enlarged to 2 ×AWG16, the
total communication length can reach 1500m (4921-
1/4ft.).
2. The cord should be Circular cord (the cores shall be
twisted together).
3. If unit is installed in places with intense magnetic
field or strong interference, it is necessary to use
shielded wire.
