Key Specifications Parameter Category Specification Drive Series/Base Model ACH550-01-246A-4 Rated Output Current 246 A Rated Output Power 132 kW (175 HP) Input Supply Voltage 380 - 480 V AC (± 10%), 3-phase Output Voltage/Phases 3-phase, 0 - Input voltage Enclosure Rating IP21 / UL Type 1 (Indoor, cabinet mounting) Cooling Method Fan-cooled Control Method ABB's Sensorless Flux Control (Magnetizing Flux Control, MFC) for HVAC. Key Standard Features • HVAC-Optimized Software: Advanced PID, multi-pump/fan control logic (lead/lag). • Built-in Building Protocols: BACnet MS/TP and Metasys N2 standard, plus Modbus RTU. • Energy Optimizer: Automatically minimizes losses for peak efficiency. • LCD Keypad with multi-language support. • Extended Safety: Fireman’s Override, smoke control sequences. Option +B055 External Braking Resistor Unit • Function: Provides a path to dissipate regenerative braking energy. • Includes: Internal DC brake chopper and an external, pre-selected braking resistor assembly. • Purpose: Enables controlled deceleration of high-inertia loads (large fans) and prevents drive overvoltage trips during stopping. Protection Features • Comprehensive motor thermal and electrical protection. • Drive overtemperature protection. • Braking resistor thermal protection (via +B055 unit). Application Focus Large Air Handling Units (AHUs), Centrifugal Chillers, Cooling Tower Fans, Large Industrial Pumps and Fans.