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Goodrive3000 series medium voltage VFD PROFIBUS communication
-274-
Terminal
Repeater
Repeater
1
1
2
31
30
2
3
30
31
……
……
Figure 9.6 Network with repeaters
Transmission rates and maximum transmission distance
The maximum length of a cable depends on the transmission rate. Table 9.1 lists the transmission rates
and transmission distances.
Table 9.1 Transmission rates and transmission distances
Transmission
rate (kbps)
9.6
19.2
93.75
187.5
500
1500
12000
A-type wire
(m)
1200
1200
1200
1000
400
200
100
B-type wire
(m)
1200
1200
1200
600
200
-----
-----
Table 9.2 Transmission wire parameters
Parameter
A-type wire
B-type wire
Impedance (Ω)
135
–165
100
–130
Capacitance of a unit length
(pF/m)
< 30
< 60
Circuit resistance (Ω/km)
110
--------
Wire core diameter (mm)
0.64
> 0.53
Sectional area of wire core
(mm2)
> 0.34
> 0.22
In addition to the shielded twisted-pair copper cables, you can also use optical fibers for transmission in a
PROFIBUS system. When a PROFIBUS system is applied in an environment with strong
electromagnetic interference, you can use optical fiber conductors to increase the high-speed
transmission distance. Two types of optical fiber conductors can be used. One is low-cost plastic fiber
conductors that can be used when the transmission distance is shorter than 50 meters; and the other is
glass fiber conductors that can be used when the transmission distance is shorter than 1 kilometer.
PROFIBUS fieldbus connection diagram
Содержание GD3000-01-055G-12
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