ABB ACS355-01U-02A4-2 0.37kW Micro Drive for Single-Phase 240V

Product Overview

The ABB ACS355-01U-02A4-2 is a compact, user-friendly micro drive from the ACS355 series. Rated at 0.37 kW (0.5 HP) with an output current of 2.4 A, it operates on single-phase 200-240 VAC input, making it ideal for small machinery, pumps, fans, and conveyors in light industrial settings. The drive incorporates ABB’s sensorless vector control for high starting torque and precise speed regulation.

Key Specifications

• Model: ACS355-01U-02A4-2

• Power Rating: 0.37 kW (0.5 HP)

• Input Voltage: Single-phase 200-240 VAC, 50/60 Hz

• Output Current (Continuous): 2.4 A

• Output Current (Heavy Duty): 2.0 A (150% overload for 60s)

• Control Method: Sensorless vector control, V/f control

• Protection Class: IP20 (NEMA 1)

• Built-in EMC Filter: Yes (Category C2)

• Communication: Modbus RTU (RS-485) standard

• Dimensions (HxWxD): 195 x 70 x 143 mm

• Weight: 1.2 kg

Sensorless Vector Control

The ACS355-01U-02A4-2 uses ABB’s proprietary sensorless vector control algorithm, which provides 200% starting torque at 0.5 Hz without an encoder. This allows the drive to handle high-friction loads and intermittent overloads commonly found in conveyors, agitators, and mixers.

Built-in PID Controller

For pump and fan applications, the drive features an integrated PID controller. It accepts feedback from external sensors (4-20mA or 0-10V) and adjusts motor speed to maintain setpoint. This eliminates the need for an external process controller, reducing panel space and cost. Typical uses include constant pressure pumping, duct static pressure control, and flow regulation.

Easy Setup and Connectivity

The drive includes a graphic keypad (optional for this variant) or can be configured via PC software (DriveWindow). The built-in Modbus RTU RS-485 port allows connection to a PLC or building management system. The drive supports up to 8 preset speeds, 2 analog inputs, and one relay output for fault/alarm indication.

Protection and Environmental

Comprehensive protections include overcurrent, overvoltage, undervoltage, motor overload, short circuit, and ground fault. The drive is tested for -10°C to +50°C operation and features a coated PCB for resistance to humidity and dust. The integrated EMC filter meets EN 61800-3 category C2, simplifying CE compliance.

Applications

• Small conveyors and packaging machines

• Industrial exhaust fans and blowers

• Centrifugal pumps for water treatment

• Mixers and agitators in food processing

• HVAC terminal units (fan coil, AHU)

Conclusion

The ABB ACS355-01U-02A4-2 micro drive combines robust motor control, energy savings, and ease of use in a compact package. Its sensorless vector control and built-in PID make it an excellent choice for small to medium variable torque and constant torque applications.