Wiring And Arrangement Of Rs-485 Terminals - Mitsubishi Electric FR-A720-0.4K Instruction Manual

4.24.2 Wiring and arrangement of RS-485 terminals

(1) RS-485 terminal layout
OPEN
Terminating resistor switch
Factory-set to "OPEN".
Set only the terminating resistor switch of
100Ω the remotest inverter to the "100Ω" position.
RDA1 RDB1 RDA2 RDB2
(RXD1+) (RXD1-) (RXD2+) (RXD2-)
SDA1 SDB1 SDA2 SDB2
TXD
(TXD1+) (TXD1-) (TXD2+) (TXD2-)
P5S SG P5S SG
(VCC) (GND) (VCC) (GND)
(2) Connection of RS-485 terminals and wires
Loosen the terminal screw and insert the cable into the terminal.
Screw size
M2
Tightening
0.22N•m to 0.25N•m
torque
2
Cable size
0.3mm
Small
Screwdriver
(Tip thickness: 0.4mm /tip width: 2.5mm)
CAUTION
Undertightening can cause cable disconnection or malfunction. Overtightening can cause a short circuit or malfunction due to
damage to the screw or unit.
REMARKS
Information on bar terminals
Introduced products (as of October, 2003): Phoenix Contact Co.,Ltd.
Terminal Screw Bar Terminal Model
Size (with insulation sleeve)
M2
Bar terminal crimping tool: CRIMPFOX ZA3 (Phoenix Contact Co., (Ltd.))
Use shielded or twisted cables for connection to the control circuit terminals and run them away from the main and power circuits
(including the 200V relay sequence circuit).
When using the bar terminal (without insulation sleeve), use care so that the twisted wires do not come out.
RXD
VCC
2
to 0.75mm
flat-blade screwdriver
Bar Terminal Model
(without insulation sleeve)
Al 0.5-6WH
Communication operation and setting
Name
RDA1
(RXD1+)
RDB1
(RXD1-)
RDA2
(RXD2+)
RDB2
(RXD2-)
SDA1
(TXD1+)
SDB1
(TXD1-)
SDA2
(TXD2+)
SDB2
(TXD2-)
P5S
(VCC)
SG
(GND)
Wire the stripped cable after twisting it to prevent it from
becoming loose. In addition, do not solder it.
Cable stripping size
Use a bar terminal as necessary.
Wire Size (mm
A 0.5-6 0.3 to 0.5
Description
Inverter receive+
Inverter receive-
Inverter receive+
(for branch)
Inverter receive-
(for branch)
Inverter send+
Inverter send-
Inverter send+
(for branch)
Inverter send-
(for branch)
5V
Permissible load current 100mA
Earth (Ground)
(connected to terminal SD)
5mm
2
)
4
311