INVT Goodrive390L Series User Manual page 66

Goodrive390L Series Lift-Dedicated VFD
7.1.1.1.2 Application to multiple VFDs
In pratical application to 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 at the first
and last ends, as shown in
Figure 7-4 shows the actual application.
120Ω
1 #
A +
B-
Master
202403 (V1.0）
Figure 7-1 Wiring of one RS485 VFD application
A B
PC
Figure
Figure 7-2 Onsite chrysanthemum connection
2 #
Figure 7-3 Simplified chrysanthemum connection
A + B-
1#
Shielded twisted pair
Ground RS485 line
Ground
Adapter
(cable)
7-2. Figure 7-3 shows the simplified wiring diagram.
3 # 4 #
2# 3#
Communication protocol
B
A
485- 485+
VFD
120Ω
32 #
31#
58