INVT Goodrive20-EU Series Operation Manual page 122

Goodrive20-EU Series VFD
Figure 7-1 RS485 wiring diagram for the network with one VFD
7.2.1.2 When multiple VFDs are used
In real multi-applications, the chrysanthemum connection and star connection are commonly
used.
Chrysanthemum chain connection is required in the RS485 industrial fieldbus standards. The
two ends are connected to terminal resistors of 120Ω which is shown as Figure 7-2.
Converter
GND
Computer
Figure 7-2 Practical application diagram of chrysanthemum connection
Figure 7-3 is the star connection. Terminal resistor should be connected to the two devices
which have the longest distance. (1# and 15#device)
A
B
Computer
Twisted pair cables with shield screen
485 +
Earth
RS232-485
RSM15m
INVT
VFD
Address 1
32 #
Figure 7-3 Star connection
Twisted pairs with shield screen
RS 485 Route
Earth
Converter from
RS232 to RS485
485 +
485 - 485 -
Earth
INVT
VFD
Address 2
1 #
15 #
-117-
Communication protocol
B
A
Earth
485- 485+
VFD
485 +
Terminal resistor
485 -
Earth
INVT
VFD
Address n
Main control
device
Ω
120