Mitsubishi Electric FR-A872-P Instruction Manual page 69

 RS-485 terminal wiring method
• For operating two inverters in parallel
• For operating three inverters in parallel
*1 Set the terminating resistor switch to the 100 Ω side.
NOTE
• Refer to the diagrams above to connect the inverters with RS-485 cables. Wrap the cables together around each ferrite core
(accessory of the inverter) once (two turns). Install each ferrite core on within 10 cm of the inverter.
• To connect the terminals in series, refer to the following.
To the earth (ground) terminal of the master inverter
To the reception terminals of the master inverter
To the transmission terminals of the master inverter
68
2. INSTALLATION AND WIRING
2.7 Communication connectors and terminals
GND GND
Master station
Ferrite core
1
GND GND
Master station
Ferrite core
1 1
GND
Slave station
Ferrite core
GND GND
Slave station 1
Slave 1
VCC TXD RXD
1
GND
Slave station 2
Slave 2
VCC TXD RXD