Communication Connectors And Terminals - Mitsubishi Electric FR-A802-P Instruction Manual

2.7

Communication connectors and terminals

2.7.1
RS-485 terminal block
Connecting the RS-485 terminals of the master/slave inverters enables communication for parallel operation.
For wiring, refer to page 56.
RS-485 terminal layout
Terminating resistor switch
Initially-set to "OPEN".
Set only the terminating resistor switch of
the remotest inverter to the "100Ω" position.
VCC GND TXD1+
OPEN
VCC GND + TXD
100Ω
VCC GND + TXD
VCC GND TXD2+
Wiring the RS-485 terminals
• Use a four, twisted-pair wires cable for connection.
• The size of RS-485 terminal block is the same as the control circuit terminal block. Refer to
NOTE
• The length of the individual wires connecting the terminal blocks to each other should not exceed 5 m.
• To avoid malfunction, keep the RS-485 terminal wires away from the control circuit board.
• For wiring of the RS-485 terminals used with a plug-in option, lead the wires on the left side of the plug-in option.
TXD1- RXD1+ RXD1-
- + RXD -
- + RXD -
TXD2- RXD2+ RXD2-
Communication connectors and terminals
Name Description
RXD1+ Inverter receive +
RXD1- Inverter receive -
RXD2+ Inverter receive + (for branch)
RXD2- Inverter receive - (for branch)
TXD1+ Inverter send +
TXD1- Inverter send -
TXD2+ Inverter send + (for branch)
TXD2- Inverter send - (for branch)
5V
VCC
Permissible load current 100 mA
Earthing (grounding)
GND
(connected to terminal SD)
INSTALLATION AND WIRING
page 47 for the wiring method.
55
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