LSIS SV055iG5A-4 5.5kW Variable Frequency Drive for Industrial Motor Control
The LSIS SV055iG5A-4 is a high-performance variable frequency drive from the iG5A series, designed for speed control of three-phase induction motors in industrial applications. This 400V class inverter provides 5.5 kW (7.5 horsepower) of output power and features advanced sensorless vector control for superior low-speed torque performance. The SV055iG5A-4 is suitable for a wide range of applications including pumps, fans, conveyors, mixers, and general-purpose machinery requiring precise motor speed regulation and energy-efficient operation.
Key Specifications
Model: SV055iG5A-4 AC Drive
Product Series: LS iG5A Series
Power Rating: 5.5 kW (7.5 HP) for 4-pole standard motor
Output Capacity (kVA): 9.1 kVA
Rated Current: 12 A
Main Power Supply: 3-phase 380-480 VAC (+10%, -15%), 50/60 Hz (±5%)
Output Frequency Range: 0.1 to 400 Hz (extendable to 300 Hz in sensorless vector mode)
Carrier Frequency: 1 to 15 kHz (programmable)
Overload Capacity: 150% for 60 seconds
Acceleration/Deceleration Time: 0.01 to 6000 seconds
Enclosure Rating: IP20, NEMA Type 1 (optional)
Dimensions (W × H × D): 180 × 220 × 170 mm
Weight: 3.66 kg
Control Methods: V/f control, sensorless vector control
Communication: RS485, Modbus RTU protocol
Analog Input: 1 channel (0-10V, -10-10V, 4-20mA)
Starting Torque: 150% at 1 Hz (sensorless vector mode)
Operating Temperature: -10°C to 50°C
Storage Temperature: -20°C to 65°C
Sensorless Vector Control Technology
The SV055iG5A-4 incorporates sensorless vector control, an advanced motor control algorithm that provides high torque at low speeds without requiring a speed feedback encoder. This technology delivers 150% starting torque at 1 Hz, enabling the drive to start heavy loads smoothly without stalling. The sensorless vector algorithm continuously estimates motor speed and flux based on measured current and voltage, adjusting the output frequency and voltage to maintain optimal torque production. This control method is particularly valuable for applications requiring good speed regulation and torque control without the cost and complexity of encoder feedback.
Built-in PID Controller for Process Control
The drive includes a built-in PID controller that enables closed-loop control of process variables such as pressure, flow, or temperature without requiring external process controllers. The PID function accepts feedback signals from process transmitters (4-20mA or 0-10V) and automatically adjusts motor speed to maintain the setpoint value. This feature is essential for pump pressure regulation, fan flow control, and other applications where the motor speed must respond to changing process conditions. The PID parameters are programmable and can be tuned to match the dynamics of the controlled process.
Sensorless Vector and V/f Control Modes
The iG5A series provides selectable control modes to match the requirements of different applications. V/f control (Voltage/Frequency) is suitable for multi-motor applications, pumps, and fans where high low-speed torque is not required. Sensorless vector control delivers enhanced torque performance for demanding applications such as conveyors, mixers, and extruders. The control mode can be selected based on application requirements, with the sensorless vector mode providing better speed regulation and low-speed performance at the expense of requiring motor parameter auto-tuning.
Auto-tuning and Motor Parameter Identification
The SV055iG5A-4 includes auto-tuning functionality that automatically identifies motor parameters to optimize drive performance. During auto-tuning, the drive energizes the motor (static auto-tuning) or rotates it (dynamic auto-tuning) to measure stator resistance, leakage inductance, and other parameters. These measured values are used to configure the sensorless vector control algorithm for optimal torque production and efficiency. Auto-tuning reduces commissioning time and ensures that the drive delivers maximum performance with the connected motor.
Energy Saving Operation Mode
The drive features an energy-saving operation mode that automatically optimizes motor voltage to reduce power consumption under light-load conditions. In this mode, the drive monitors motor current and calculates the optimal voltage to maintain magnetic flux at the minimum level required for the present load torque. This reduces core losses and improves overall system efficiency, particularly beneficial for variable torque applications such as pumps and fans where load varies over time. The energy saving function can reduce electricity consumption by 20-40% compared to fixed-speed motor operation.
Communications and Network Integration
The SV055iG5A-4 includes an RS485 serial communication port supporting LS Bus and Modbus RTU protocols. This enables integration with PLCs, SCADA systems, and building management systems for centralized monitoring and control. The drive can be networked with other iG5A drives and host controllers, allowing operators to read operational parameters, adjust setpoints, and monitor fault status from a central location. Optional communication modules are available for CANopen, BACnet, EtherNet/IP, and Profibus protocols, expanding integration possibilities.
Protection and Reliability Features
The drive incorporates comprehensive protection functions to safeguard both the drive and the connected motor. Electronic thermal protection models motor temperature based on current and time, preventing overheating. Overload warning and trip functions protect against excessive mechanical loads. Stall prevention during acceleration and deceleration maintains control under difficult load conditions. Output phase loss protection detects and responds to missing motor phases. The drive also includes overvoltage, undervoltage, overcurrent, and ground fault protection. The fault history records the last five events for diagnostic purposes.
User-Friendly Interface and Configuration
The SV055iG5A-4 features a user-friendly keypad interface with a digital display for easy configuration and monitoring. The display shows output frequency, current, voltage, power, and other parameters in real time. The programming structure is organized by function groups, with logical navigation using cursor keys. The drive supports PNP/NPN signal input selection, accommodating different PLC output configurations. The cooling fan incorporates on/off control based on drive temperature, extending fan life and reducing energy consumption.
Industrial Applications
The LSIS SV055iG5A-4 is deployed across a wide range of industrial motor control applications. In pump systems, it maintains constant pressure by varying pump speed. In fan and blower applications, it controls airflow for ventilation and cooling. On conveyors, it provides smooth starting and speed matching for production lines. In mixers and agitators, it delivers controlled acceleration and consistent mixing speed. The drive's 5.5 kW power rating and 150% overload capacity make it suitable for applications with intermittent high-torque demands.
Conclusion
The LSIS SV055iG5A-4 AC drive delivers 5.5 kW of motor control with sensorless vector technology, built-in PID controller, RS485 Modbus RTU communication, and comprehensive protection functions. Its compact IP20 enclosure, auto-tuning capability, and energy-saving operation make it a versatile solution for pump, fan, conveyor, and general-purpose industrial motor applications.
