Key Specifications Parameter Category Specification Drive Series/Model ACH550-UH-031A-4 Rated Output Current 31 A Rated Output Power 15 kW (20 HP) Input Supply Voltage 380 - 480 V AC (± 10%), 3-phase Input Supply Phases 3-phase Output Voltage 0 - Input voltage Output Phases 3-phase Enclosure Rating NEMA 3R / Type 3R / IP54. Suitable for indoor/outdoor use. Weather-resistant. Cooling Method Fan-cooled Control Method ABB's proprietary Sensorless Flux Control (Magnetizing Flux Control, MFC) for HVAC applications. Key Standard Features • HVAC-Specific Application Macros: Pre-programmed for Air Handling Units (AHU), Cooling Towers, Pumps, etc. • Advanced PID Control: Dual PID sets, sleep/wake function, PID freeze. • Multi-Pump & Multi-Motor Control: Built-in logic for lead/lag/alternation of up to 4 pumps or fans. • Built-in Building Automation Protocols: BACnet MS/TP and Metasys N2 are standard, along with Modbus RTU (RS-485). • Energy Optimizer: Automatically minimizes motor and drive losses for maximum efficiency across the load range. • Extended Safety Sequences: Includes Fireman’s Override and Smoke/Fire Control modes. • LCD Keypad: Multi-language display with parameter copy function. Protection Features • Motor thermal overload protection (I²t) • Pump/Fan-specific protection (dry pump, anti-jam, underload) • Comprehensive electrical protection (short circuit, ground fault, over/undervoltage) • Heatsink overtemperature protection • Conformal Coated PCB for protection against corrosive atmospheres (standard in -UH enclosure). Application Focus Air Handling Units (AHUs), Cooling Towers, Chilled Water & Condenser Pumps, Exhaust Fans, Centrifugal Compressors in HVAC systems.