Key benefits - External controller compatibility for precise speed control: can be connected to an external controller to achieve speed regulation via 0-5V/0-10V analog input or 0-20 mA current input. - Immediate protection for faults: activates short-circuit protection as soon as a short occurs, helping protect the motor and system. - Wide speed and frequency range: maximum output frequency selectable from 0 to 400 Hz to cover a broad set of motor speeds. - Flexible functionality for water systems: includes a multi-function relay output and a constant pressure water supply function for pump applications. - Fast, reliable response and protection: quick-response performance with high and low speed capability, plus internal protections for various fault conditions. Core features and specifications - Control inputs: 0-5V/0-10V analog input and 0-20 mA current input for speed regulation. - Output capability: frequency converter supports up to 0-400 Hz output frequency. - Protection mechanisms: internal protections include under-, over-, over-current, and over-heat protections. - Relay features: multi-function relay transmission available for allied control logic and signaling. - Special function: constant pressure water supply function for pump systems. Use scenarios - Conveyor or packaging line control: integrate with a PLC or external controller to adjust motor speed in real time using 0-10V or 0-20 mA signals, enabling synchronized process flow and precise handling. - Constant-pressure water pump systems: implement the constant pressure water supply function to maintain stable system pressure despite variable demand, reducing pump cycling and improving efficiency. - Testing and dynamic load applications: use the 0-400 Hz output to drive motors in test rigs, fans, or small machinery requiring rapid speed changes with reliable protection and quick response. Compatibility and integration notes - Designed to connect with external controllers via standard 0-5V/0-10V analog inputs and 0-20 mA current input. - Includes a multi-function relay output for signaling and control integration. - Built-in protections help prevent damage during abnormal conditions and support safer operation in diverse applications. This description preserves the product’s specifications and functions while presenting them in a clear, customer-focused format.