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Intelligent Variable Frequency Drive for Water Pump System IP55. Dedicated VFD for constant-pressure water supply. Built-in PID auto pressure regulation. Smart sleep-wake energy-saving function. Max. 6-pump master-auxiliary group control. Support 4-20mA & 0-10V pressure sensors. Multiple protection: dry-run, overheat, sensor fault. RS485 Modbus for remote communication. Dual LED display & convenient shortcut keys.