Fangrui Product Details The Product Can Be Connected With An External Controller To Realize Infinite Speed Regulation Control By 0-5v/0-10v Analog Voltage Input And 0-20ma Current Signal Input. Frequency Converter Has Quick Start-stop Response And High Low Speed Torque.the Internal Protection Function Of The Product Has Such Protection Functions As Under-voltage, Over-voltage, Over-current, Over-heat, Etc. When Short-circuit Occurs, It Stop Immediately To Protect The Host (short-circuit Protection).the Maximum Output Frequency Of The Converter Is 0-400 Hz. Frequency Converter With Multi-function Relay Mission, Pid Function, Constant Pressure Watersupply Function. Inverter Built-in Temperature Detection, Internal Self-cooling Function For The External Environment Requirements Are Low.the Additional Control Panel Is Equipped With External Fixed Casing Support And 1 Meter Long Connecting Wire. This Is A Kind Of Fine Quality Variable Frequency Inverter, Which Can Be Connected With An External Controller To Realize Infinite Speed R