Instruction manual
21
1
OUTLINE
Connection and Parameter Setting
1.4.4 Connection of multiple inverters using RS-485 terminal
RS-485 terminal is used for connecting multiple inverters with Serial port of a computer.
Up to 32 inverters can be connected. Serial/RS-485 converter (Refer to page 18) is required.
(FR-E700 series requires control terminal option FR-E7TR. FR-E700-SC/NC are not compatible with FR-E7TR.)
(1) Wiring
The following indicates connection diagram of the multiple inverters. Refer to the Inverter Instruction Manual for details.
*1Make connection in accordance with the instruction manual of the computer to be used with.
Fully check the terminal numbers of the computer since they change with the model.
*2For the inverter farthest from the computer, set the terminating resistor switch to ON (100 position).
(2) Related parameters for multiple connection using RS-485 terminal
Set the following communication parameter when connecting RS-485 terminal of the inverter.
When performing parameter writing or run command input, set the following command source parameters, and switch
the operation mode to the following operation mode.
* Depending on the production year and month of FR-A700, the setting range and initial value of Pr. 551 may differ. For the details, refer to the Appendices of the
Instruction Manual of the inverter.
Inverter
Communication
Option
Parameter Setting Operation
Mode
Communication Parameter Command Source Parameter
FR-A700,
A701, F700,
F700P
No
Set the station number of the each inverter in
Pr. 331 RS-485 communication station number (when
connecting multiple inverters)
Pr. 336 RS-485 communication check time interval
"0"
(initial value 0)
Pr. 337 RS-485 communication waiting time setting =
"9999"
(initial value)
Initial value NET
Yes
Pr. 551 PU mode operation command
source selection = "1"
(initial value 9999: FR-A700) *
(initial value 2: FR-A701, F700 and
F700P)
PU
FR-E700
No
Set the station number of the each inverter in
Pr. 117 PU communication station number (when
connecting multiple inverters)
Pr. 122 PU communication check time interval
"0"
(initial value 0)
Pr. 123 PU communication waiting time setting =
"9999"
(initial value)
Initial value NET
Yes
Pr. 551 PU mode operation command
source selection = "2"
(initial value 9999)
PU
RS-232C RS-485
Converter
Up to
32 inverters
RS-485 terminal block
Serial port
Serial cable
RS-422 / 485
Personal computer
(FR Configurator)
Inverter
Computer
Send
Receive
Station 0
S
G
S
G
S
D
B
S
D
A
S
D
B
S
D
A
R
D
B
R
D
A
R
D
B
R
D
A
S
D
B
S
D
A
S
D
B
S
D
A
R
D
B
R
D
A
R
D
B
R
D
A
S
D
B
S
D
A
R
D
B
R
D
A
Station 1
S
G
S
G
Station n
S
G
SG
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
+
+
-
-
*1
*2