INVT Goodrive270 Series User Manual

Goodrive270 series VFD for fan and pump Communication protocol
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9.3.1.2 Application to multiple VFDs
In practical application to multiple VFDs, chrysanthemum connection and star connection are
commonly used.
According to the RS485 industrial bus standards, all 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.
1# 2
#
3 # 4 # 32 #
120Ω
120Ω
Figure 9-2 Onsite chrysanthemum connection
1# 2# 3# 31#Master
A+
B-
A+ B-
Figure 9-3 Simplified chrysanthemum connection
INVT
VFD
Address 1
Earth
485+
485-
485+
485-
485+
485-
120Ω
Terminal resistor
PC
Converter
GND
RS232-RS485
Max. length of the
cable: 15 m
Shielded twisted pair
Address 2 Address N
INVT
VFD
INVT
VFD
Earth Earth
Figure 9-4 Practical chrysanthemum connection application
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
(the two devices are devices #1 and #15).

INVT Goodrive270 Series Specifications

General

Brand	INVT
Model	Goodrive270 Series
Category	Water Pump
Language	English