Kruger Ecowatt K320 Series Operation Manual page 287

Ecowatt Drive K320 series
®
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 9-2. Figure 9-3 is the simplified wiring diagram, and Figure 9-4 is the practical
application diagram.
120Ω
1 #
A+
Master
Figure 9-3 Simplified chrysanthemum connection diagram
Shielded twisted pair
RS232-RS485
Converter
Max. length of the
GND
PC
Figure 9-4 Practical application diagram of chrysanthemum connection
Figure 9-5 shows the start connection diagram. When this connection mode is adopted, the
two devices that are farthest away from each other on the line must be connected with a
terminal resistor (in Figure 9-5, the two devices are devices 1# and 15#).
2 #
Figure 9-2 Onsite chrysanthemum connection diagram
B-
A+ B-
1#
485 +
485-
Earth
VFD
cable: 15 m
Address 1
32#
Figure 9-5 Star connection
3 # 4 #
2# 3#
485+
485 -
Earth
VFD
Address 2
1#
15#
-278-
Communication
120Ω
32 #
31#
120Ω
485 +
Terminal resistor
485-
Earth
VFD
Address N