Key Specifications Parameter Category Specification Drive Series/Base Model AYK550-UH-097A-4 (Yaskawa J1000 platform for ABB) Rated Output Current 97 A Rated Output Power 45 kW (60 HP) Input Supply Voltage 380 - 480 V AC (± 10%), 3-phase Output Voltage/Phases 3-phase, 0 - Input voltage Enclosure Rating NEMA 3R / Type 3R / IP54. Weather-resistant for outdoor use. Cooling Method Fan-cooled Control Method Sensorless Vector Control (Yaskawa platform) Key Standard Features • HVAC-Optimized Software: Includes PID control, multiple fans/pumps control logic. • Built-in Communication: Modbus RTU (RS-485) & BACnet MS/TP standard. • Keypad: LCD display with parameter copy function. • Conformal Coated PCB (standard in -UH). Option +B055 External Braking Resistor Unit • Function: Safely dissipates regenerative braking energy. • Includes: Internal brake transistor and an external, matched braking resistor assembly. • Purpose: Prevents DC bus overvoltage during deceleration, enables faster stopping. Option +K465 Extended I/O and Control Module • Expands I/O Capacity: Adds extra digital inputs (DI), digital outputs (DO), analog inputs (AI), analog outputs (AO), and relay outputs (RO). • Adds Pulse Train Input (PGI): For direct connection to encoder/speed sensors. • Purpose: Enables connection to more external devices (sensors, switches, actuators, BMS) and more complex control logic without external PLCs. Protection Features • Motor thermal overload, overcurrent, ground fault, short circuit protection. • Drive IGBT overtemperature protection. • Braking resistor thermal protection (via +B055). Application Focus Large HVAC systems: Air Handling Units (AHUs), Cooling Towers, Large Pumps (Chilled/Condenser Water), Industrial Ventilation Fans.