Technical Parameters Parameter Category Specification Notes Series / Family ACS550 - General Purpose Drive Part of the ABB Industrial Drives family. Product Type Variable Frequency Drive (VFD) / Adjustable Speed Drive (ASD) For controlling 3-phase AC induction motors. Supply Voltage 3-phase, 200...240 V AC ±10% Defined by -01- in the code. Frequency: 48...63 Hz. Output Power 4.0 kW (5.5 hp) Defined by 023A: 023 corresponds to a frame size, A indicates 4.0kW at 240V. Output Current 12.0 A (Continuous) Maximum continuous output current. Motor Control Mode Volts/Hertz (Scalar Control) with optional Flux Optimization (MTC). Provides energy-efficient scalar control. Enclosure Rating IP21 / NEMA Type 1 (Open chassis) For mounting inside a control cabinet. -4 indicates a chassis unit without an operator panel. Key Features - Built-in PID Controllers (2) for process control. - 7 Custom Macros for quick application setup. - Follow-up (Flying Start). - Energy Savings mode via Flux Optimization. - Modbus RTU communication (RS485) as standard. - Safe Torque Off (STO) safety function (SIL 2). Focus on pump, fan, and compressor control. Option Code (+B055) Internal Braking Chopper + Braking Resistor Kit +B indicates an internal brake chopper is present. 055 specifies a matching braking resistor kit (e.g., a specific ohmic value and power rating) for dynamic braking. Control Connections - 2 Analog Inputs (0/4...20 mA or 0...10 V) - 2 Analog Outputs (0/4...20 mA) - 6 Digital Inputs (24 V DC) - 2 Digital/Relay Outputs - RS485 port Standard I/O for basic control and monitoring. Protection Features Motor overload, short circuit, ground fault, overvoltage, undervoltage, overtemperature, phase loss, etc. Comprehensive drive and motor protection. Ambient Temperature -10°C to +40°C (up to +50°C with derating) Requires adequate ventilation. Storage Temperature -40°C to +70°C Relative Humidity < 95% (non-condensing) Altitude < 1000 m above sea level without derating. Requires current derating at higher altitudes. Mounting Wall-mounted inside a cabinet. Approx. Dimensions (W x H x D) ~ 150 mm x 245 mm x 187 mm Dimensions vary slightly by frame size. Approx. Weight ~ 3.5 kg