Technical Parameters (SK3403 - 22/30KW Configuration) Model: SK3403 (High-power variant / or SK3407 equivalent) Series: Commander SK Product Type: AC Variable Frequency Drive (Inverter) Input Phase: Three-phase Input Voltage: 380V to 480V AC ±10% Input Frequency: 48 to 62 Hz Power Ratings: Heavy Duty (HD - Constant Torque): 22 kW (30 HP) Normal Duty (ND - Variable Torque): 30 kW (40 HP) Output Current: Heavy Duty: Approx. 45 A (typical at 400V) Normal Duty: Approx. 60 A (typical at 400V) Output Voltage: 3-phase, 0 to rated input voltage (variable frequency) Output Frequency: 0 to 1500 Hz (programmable) Control Mode: Open-loop Vector (Sensorless) / V/Hz Switching Frequency: 3 kHz to 16 kHz (adjustable, derating applies at higher frequencies) Overload Capacity: Heavy Duty: 150% for 60 seconds Normal Duty: 110% for 60 seconds Digital Inputs: 4 x programmable digital inputs Analog Input: 1 x analog input (0-10V, 4-20mA selectable) Analog Output: 1 x analog output (0-10V) Relay Output: 1 x changeover relay output (programmable) Communications: Standard MODBUS RTU (RS485) via RJ45 Braking: Standard dynamic braking unit (integrated transistor) Protection Class: IP20 (requires enclosure for installation) Operating Temperature: -10°C to +40°C (derating above 40°C to max 50°C) Cooling Method: Forced air cooling (high-capacity fans) Dimensions (H x W x D): Approx. 350 mm x 200 mm x 200 mm (13.8" x 7.9" x 7.9") - typical for frame 4/5 Weight: Approx. 12 kg (26.5 lbs) Standards: CE, UL, cUL, EN61800-3, RoHS