Parameters (Specifications) Brand: Emerson (Control Techniques) Model Number: A6740 Product Series: Unidrive SP / Unidrive M (high-performance series) Product Type: AC Drive Power Module / Inverter Power Rating: Typically 37 kW (50 HP) for 380-480V input Input Voltage: 380-480 VAC three-phase (standard) May also support 500-690 VAC variants (check specific model) Output Voltage: Proportional to input voltage Output Frequency: 0-590 Hz (standard), up to 3 kHz with high-frequency options Number of Phases: 3-phase output Control Modes: Open Loop V/Hz (Volts per Hertz) Open Loop Vector (Sensorless Vector) Closed Loop Vector (with encoder feedback) Servo Control (with appropriate feedback) Regenerative modes available Overload Capacity: Heavy Duty: 150% for 60 seconds Normal Duty: 110% for 60 seconds Protection Rating: IP20 (standard, for enclosure mounting) or IP21/NEMA 1 options available Cooling: Forced air cooling with internal fans (higher airflow than smaller models) Communication Options: Built-in Modbus RTU Optional fieldbus modules: Profibus, DeviceNet, CANopen, EtherNet/IP, PROFINET, EtherCAT I/O (typical): 6-8 digital inputs 3-4 digital outputs 3 analog inputs (0-10V, 4-20mA) 2 analog outputs Encoder feedback input (standard or optional) Motor Control Performance: Speed control accuracy: 0.01% (closed loop) Torque control accuracy: ±5% Braking: Built-in braking transistor (external resistor required for higher power) Ambient Temperature: 0°C to 40°C (32°F to 104°F) derated above Altitude: Up to 1000m without derating Certifications: CE, UL, cUL, RoHS Dimensions: Larger frame size (typically size 6 or 7) Weight: Approximately 20-40 kg (44-88 lbs) depending on configuration