Goodrive20-UL Series VFD
Communication protocol
-115-
Twisted pairs with shield screen
Converter from
RS232 to RS485
Computer
Earth
Earth
VFD
RS 485 Route
485-
485+
A
B
A
B
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 120
Ω which is shown as Figure 7-2.
INVT
VFD
INVT
VFD
INVT
VFD
Address 1
Address n
Earth
485
+
485
-
Earth
485
+
485
-
Earth
485
+
485
-
120Ω
Terminal resistor
Computer
Converter
GND
RS232-485
RSM15m
Twisted pair cables with shield screen
Address 2
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)
1
#
15
#
32
#
6
#
Main control
device
Figure 7-3 Star connection
Содержание GD20-0R4G-2-UL
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