Goodrive18 series two-in-one VFD Communication
-112-
Shielded twisted pair
GND
GND
PC
RS485 line
RS 232
–
RS485
adapter
485- 485+
VFD
Figure 7.1 RS485 wiring diagram for the network with one VFD
7.2.1.2 When multiple VFDs are used
In the network with multiple VFDs, chrysanthemum connection and star connection are
commonly used. According to the requirements of the RS485 industrial bus standards, all the
devices need to be connected in chrysanthemum mode with one 120 Ω terminal resistor on
each end, as shown in Figure 7.2.
INVT
VFD
Address 1
Ground
485+
485-
Ground
485+
485-
Ground
485+
485-
120Ω
Terminal
resistor
PC
Adapter
GND
RS232- 485
RS cable max.
length: 15m
Shielded twisted pair
Address 2
Address n
INVT
VFD
INVT
VFD
Figure 7.2 Practical application diagram of chrysanthemum connection
Figure 7.3 shows the start connection diagram. When this connection mode is adopted, each
of the two devices that are farthest away from each other on the line must be configured with a
terminal resistor (in this figure, the two devices are devices 1# and 15#).
To Next Page
Loading...
Need help?
General
