INVT Goodrive3000 Series Operation Manual page 220

Goodrive3000 series medium voltage VFD
Some devices use RTS to determine the transmission directions. In normal applications, only A-Line, B-Line, and the
shield layer need to be used.
It is recommended that you use the standard DB9 connectors manufactured by Siemens. If the communication baud rate
is required to be higher than 187.5 kbps, strictly follow the wiring standards stipulated by Siemens.
Repeater
A maximum of 31 nodes (including the master node) can be connected to each bus segment. If the number of nodes to be
connected to a bus segment exceeds 31, you need to use repeaters to connect the bus segment. Generally, the number
of repeaters connected in series cannot exceed 3. Note: No station address is provided for repeaters, but they are
calculated as stations.
Transmission rates and max. transmission distance
The maximum length of a cable depends on the transmission rate. Table 9-1 lists the transmission rates and transmission
distances.
Transmission
rate (kbps)
A-type wire (m)
B-type wire (m)
Parameters
Impedance (Ω)
Capacitance of a unit length
(pF/m)
Circuit resistance (Ω/km)
Wire core diameter (mm)
Sectional area of wire core (mm
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
Figure 9-5 Standard PROFIBUS connector
Terminal
1
......
2 3
Repeater
1 2
Figure 9-6 Network with repeaters
Table 9-1 Transmission rates and transmission distances
9.6 19.2
1200 1200
1200 1200
Table 9-2 Transmission wire parameters
A-type wire
2
)
Repeater
30 31
30 31
......
93.75 187.5
1200 1000
1200 600
135–165
< 30
110
0.64
>0.34
-214-
PROFIBUS communication
500 1500 12000
400 200
200 -----
B-type wire
100–130
< 60
--------
>0.53
>0.22
100
-----