E65807
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8
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6 ‑
4. Connection and start-up
■
Procedure
(1) Set the communication speed to SW on the RS-485 Option Unit.
(2) Connect terminating resistor in both ends of units. The RS-485 Option Unit has internal
terminating resistor. Set SW3 and SW4 to ON to connect these terminating resistors.
(Refer to a page 5)
(3) Install the RS-485 Option Unit on a metal panel.
(4) Connect the cable to the removable terminal block. If the stick-lugs are not used, strip the
insulation from the wire and insert the wire directly into the terminal. Be sure not to short any
wires. Wire the cable as shown in the figure. Use a common cable in the system.
(5) Connect the shield of the twisted pair cable to the SHIELD terminal on each RS-485 Option Unit,
and make the ground connection. Do not connect host computer ground to a power ground or
any other noise-producing ground connection.
(6) Insert the removable terminal block back into the RS-485 Option Unit.
(7) Connect the communication connectors (INVERTER1 and INVERTER2) of the RS-485 Option
Unit to the inverter’s common serial option (communication) connector of the with the optional
cable.
(8) Turn on the power of the inverter.
(9) Set the communication parameters of the inverter. (Refer to a page 9)
Shielded twisted-pair cable
0.2~1.5mm
2
(AWG size: 24~16)
（＊１）
(recommendation: More than 0.4mm
2
（＊２）
)
Terminating
resisitor
120
Ω
-1/2W
SW3,SW4=OFF
Ground
(100
Ω
or less)
Host Computer
RS485
Option Unit
TXA
TXB
RXA
RXB
SG
FG
RXA
RXB
TXA
TXB
SG
SHIELD
RXA
RXB
TXA
TXB
SG
SHIELD
RXA
RXB
TXA
TXB
SG
SHIELD
（＊２）
:When transmission
distance exceeds 500m,
please use 0.75mm
2
two
or more cables.
（＊１）
：
It is one electric-wire size at
two wires connection.
See page5 when stick t
erminal is used.
SW3,SW4=OFF
SW3,SW4=ON
Set terminating resistor
RS485
Option Unit
RS485
Option Unit
