INVT Goodrive350 Series Operation Manual page 10

Communication extension card
3. Transmission rates and maximum transmission distances
The maximum length of a cable depends on the transmission rate. Table 2-2 describes
the transmission rates and corresponding transmission distances.
Table 2-2 Transmission rates and corresponding transmission distances
Transmission rate (kbps)
93.75
187.5
1500
12000
Capacitance of a unit length (pF/m)
Circuit resistance (Ω/km)
Wire core diameter (mm)
Sectional area of wire core (mm
Besides 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 m; and the other is glass fiber conductors that can be used when
the transmission distance is shorter than 1 km.
4. PROFIBUS bus connection diagram
PROFIBUS
master station
A
9.6
19.2
500
Table 2-3 Transmission wire parameters
Parameter
Impedance (Ω)
B GND
Figure 2-3 PROFIBUS bus connection
A-type wire (m)
1200
1200
1200
1000
400
200
100
2
)
INVT inverter
CH-PA01 adapter
A B SHLD
-5-
PROFIBUS communication card
B-type wire (m)
A-type wire
135–165
< 30
110
0.64
> 0.34
INVT inverter
CH-PA01 adapter
A B SHLD
1200
1200
1200
600
200
-----
-----
B-type wire
100–130
< 60
--------
> 0.53
> 0.22