User Guide of EM730 Series Inverter RS485 communication interface of host + terminal - terminal GND A+ GND A- A+ GND A- A- A+ GND A- A+ GND ON Inverter S1 OFF Inverter S1 OFF Inverter S1 OFF Inverter S1 Fig. 3-17 Wiring of Communication Terminals of Multiple Inverters Connection to the host via RS485/RS232 adapter for communication: Inverter A+ RS232 communicatio A- RS485/RS232 adapter n interface of S1 ON GND host Fig. 3-18 Communication Terminal Wiring 3.3.8 Precautions for control circuit wiring Connect the control circuit connection wires and other wires separately. Connect the control circuit terminals EA, EB, EC, and Y1 separately from other control circuit terminals.
In order to avoid malfunction caused by interference, use the twisted shielded cables in the control circuit. The wiring distance should be less than 50 m. Prevent the shield screen from contact with other signal lines and enclosures. The exposed shield screen can be wrapped with insulating tapes. It is prohibited to touch the ports and components of the control panel without static electricity protection measures. 28