5. When using external analog quantity and control terminal control, if the connection line is within 1m, use shielded cable to connect, and implement the inverter side, one-point grounding is sufficient; if the line is long and there is serious interference on site, it is recommended to install a DC/DC isolation module on the inverter side, or use V/F conversion and frequency command setting mode for control.
6. When using external communication control terminals for control, it is recommended to use shielded twisted pair cables and ground the shield layer on the inverter side (PE). If the interference is very serious, it is recommended to connect the shield layer to the control power ground (GND). For RS232 communication, pay attention to the control line and try not to exceed 15m. If you want to extend it, you must reduce the communication baud rate. When it is about 100m, the baud rate that can communicate normally is less than 600bp. For RS485 communication, you must also consider the terminal matching resistance, etc. For field bus and high-speed control systems, communication cables must use special cables and multi-point grounding to improve reliability.
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