Technical Parameters (SK3401) Model: SK3401 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 Typical Power Ratings (Three-phase 400V input): 0.75 kW (1 HP) - typical 1.1 kW (1.5 HP) - possible variant 1.5 kW (2 HP) - possible variant Output Current: At 0.75kW: Approx. 2.1 A At 1.1kW: Approx. 3.0 A At 1.5kW: Approx. 4.1 A 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 above 6 kHz) Overload Capacity: 150% for 60 seconds (Normal Duty rating) 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) on select models Protection Class: IP20 (requires enclosure for installation) Operating Temperature: -10°C to +40°C (at 3 kHz switching frequency, derating to 50°C) Cooling Method: Natural convection (fanless operation at lower currents) Dimensions (H x W x D): Approx. 150 mm x 70 mm x 120 mm (5.9" x 2.8" x 4.7") - typical for size 1 Weight: Approx. 0.9 kg (2.0 lbs) Standards: CE, UL, cUL, EN61800-3, RoHS Typical Applications Small Conveyors: Material handling, packaging lines Pumps: Small centrifugal pumps, dosing pumps Fans: Ventilation fans, exhaust fans Mixers: Small industrial mixers and agitators Machine Tools: Spindle control, auxiliary drives Food Processing: Small mixing and conveying applications Textile Machinery: Winding, spinning auxiliary drives General Automation: Various small machines requiring variable speed control