INVT Goodrive300 Series Operation Manual page 239

Goodrive300 Series VFD
A.2.6.4 Transmission rate and maximum distance
Maximum length of cable depends on the transmission rate. The Table below shows the relationship
between transmission rate and distance.
Transmission rate (kbps)
9.6
19.2
93.75
187.5
500
1500
12000
Transmission line parameters:
Transmission rate (kbps)
Impedance (Ω)
Capacitance per unit length(pF/m)
Loop Resistance (Ω/km)
Core wire diameter (mm)
Line-core cross-section (mm
Besides shielding twisted-pair copper wires, PROFIBUS can also use optical fiber for transmission in
an electromagnetic interference environment to increase the high-speed transmission distance there
are two kinds of fiber optical conductors, one is low-cost plastic fiber conductor, used distance is less
than 50 meters, the other is glass fiber conductor, and used distance is less than 1 kM.
Terminal
1
2 3
Repeat
er
1 2
2
)
30 31
30 31
A-wire (m)
1200
1200
1200
1000
400
200
100
A-wire (m)
135–165
< 30
110
0.64
> 0.34
234
Extension card
Repeat
er
B-wire (m)
1200
1200
1200
600
200
-----
-----
B-wire (m)
100–130
< 60
--------
> 0.53
> 0.22