Limitation On Transmission Line Wiring; M-Net Transmission Line - Mitsubishi Electric G-50A Technical Manual

4.3 Limitation on transmission line wiring

The material and wiring limitation of transmission line and signal line are given in Table 4-4.
For the detail of the limitation on each wiring length, please refer to Items 4.3.1.
Table 4-4 Materials used for transmission/signal lines and limitation of wiring length
Transmission route
Centralized control system M-NET bus
Indoor-outdoor transmission
system M-NET bus
Between timer kit and each
ice heat storage outdoor unit
Indoor-outdoor connecting
line of A-control Slim air
conditioner
K-control transmission line

4.3.1 M-NET transmission line

Figure 4-1 shows the wiring example of M-NET bus.
When the centralized control system M-NET bus and indoor-outdoor transmission M-NET bus per one
system are shown in relation with the wiring length limitation, the total wiring length in the following
example can be expressed by the following equation.
This represents the distance limitation to perform proper communication with other equipment on M-NET
bus. If this distance is exceeded, M-NET signal can not reach the end equipment thus making the
communication and control impossible.
a+b+d+e(f) 500m
The local remote controller wiring length counts for 10m or less. When it exceeds 10m, add the exceeded
length to the value of "total wiring length 500m or less."
Centralized control system M-NET bus
Centralized
controller (G-50A)
Power supply unit
(PAC-SC50KUA)
2
CVVS1.25mm -2C or CPEVSf1.2-1P
2
CVVS1.25mm -2C or CPEVSf1.2-1P
In case when the wiring length of cable connecting to local
remote controller is less than 10m, use 2-core cable of 0.3 ~
2
1.25mm (recommend to use 0.75mm
convenience). When it exceeds 10m, use CVVS1.25mm
or CPEVSf1.2-1P for the exceeded portion.
3-core cable of 0.75mm
VVFf1.6 -3C
For the cable connecting with local remote controller, use the
optional remote controller cable (wire length of 10m ~ 20m)
or 2-core cable of 0.3 ~ 1.25mm
2-core cable of f1.6 or more
Wire type: Use any of VCTF, VCTFK, CVV, CVS, VVR, VVF
or VCT. When the cable connecting to local remote
controller is less than 12m, use 2-core cable of 0.5 ~
2
0.75mm , while when it exceeds 12m, use the above cable
for the exceeded portion.
a+b+c+g 500m
b
Outdoor unit
a
c
Outdoor unit
Figure 4-1 M-NET bus wiring diagram
Wire type
2
or less for wiring
2
or more
2
.
e(f)+d+c+g 500m
Indoor-outdoor transmission system M-NET bus
d
Indoor unit
f
g
Indoor unit
Limitation on wire length
Total wiring length: 500m or less
Centralized control system M-NET bus
(Power supply distance): 200m or less
Indoor-outdoor transmission line
M-NET bus (Power supply distance):
2
-2C 200m or less
Remote controller wiring: 10m or less
Wiring length: 200m or less
Total wiring length: 50m or less
Remote controller wiring length: 10m
or less
(Extendable up to 200m)
Total wiring length in case of
K-control model 20 sets and local
remote controller of 10 sets or less:
500m or less
K-control model 50 sets and local
remote controller of 25 sets or less:
200m or less
Other than above: Requires relay board.
Remote controller wiring: 12m or less
e
Indoor unit
Indoor unit
Indoor unit
10m
Local
remote
controller
17