LTi Drives SO84.012.0002.0100.2 Servo Controller

The LTi Drives SO84.012.0002.0100.2 is a servo controller from the Servo One family, a platform developed by LTi Drives for high performance motion control in industrial machinery. The ordering code identifies a 400 V three phase unit with a nominal output current of 12 A and an output frequency range extending to 400 Hz. This combination makes the drive suitable for a broad spectrum of applications, from low speed high torque feed axes to high speed spindle and rotary indexing tasks.

The Servo One platform was designed around a consistent control core that is shared across all power ratings. This means that commissioning procedures, parameter structures and diagnostic concepts remain the same whether a machine uses a small single axis unit or a larger multi axis configuration. For machine builders and maintenance teams, this consistency reduces engineering effort and simplifies long term support.

Product Overview

The SO84.012.0002.0100.2 operates as a single axis servo controller. It draws power from a three phase 400 V mains supply and produces a controlled output voltage and frequency for the connected motor. The output stage uses pulse width modulation with a high switching frequency, producing smooth current waveforms and low torque ripple. The control core executes current, velocity and position loops in a closed cascade, each with independently adjustable parameters to match the mechanical characteristics of the load.

The drive is intended for cabinet mounting and is designed to be installed alongside other units in a multi axis arrangement. Shared DC bus operation allows braking energy from one axis to be used by another, which improves energy efficiency and reduces the load on braking resistors. The unit supports both rotary servo motors and, in appropriate configurations, linear motors, giving machine designers flexibility in how axes are implemented.

Key Features and Functional Highlights

Feedback support covers resolvers, incremental encoders and absolute encoders. Automatic commutation detection and motor identification reduce commissioning effort and minimize the risk of incorrect parameter entry. Parameter sets can be stored internally and transferred between units, which simplifies machine replication and spare parts replacement.

Integrated safety technology includes Safe Torque Off, allowing the drive to be placed in a safe state without removing DC link power. This supports machine concepts where operators must enter hazardous areas while other axes remain energized. Monitoring functions continuously evaluate current, voltage, temperature and following error, and they trigger defined fault responses when limits are exceeded, protecting the motor and the mechanical system.

An internal brake chopper allows braking energy to be dissipated through an external resistor when the DC bus cannot absorb it. This is important for high inertia loads that must be decelerated quickly. Digital and analog inputs and outputs provide fast interfacing with machine signals such as enable, limit switches, reference pulses and brake control.

Technical Specifications

The SO84.012.0002.0100.2 is rated for a three phase 400 V mains connection. Nominal output current is 12 A, with short term overload capability for acceleration peaks. Output voltage is variable up to the level available from the DC link, and output frequency extends to 400 Hz, supporting both standard servo motors and high speed applications. The power stage switching frequency is selected to balance acoustic noise, losses and control bandwidth.

Communication with the higher level controller is handled through a fieldbus interface. The Servo One family supports EtherCAT, PROFIBUS, PROFINET, CANopen and EtherNet/IP depending on the option fitted. Analog and digital signal interfaces are also available, allowing the drive to be used in centralized and decentralized motion architectures. A dedicated output for a motor holding brake is provided for vertical axes.

Performance and Advantages

Short current loop cycle times produce fast response to torque commands and minimize following error during dynamic moves. This is valuable in applications involving high acceleration, frequent direction changes or tight contouring tolerances. The velocity loop offers adjustable gain, integral time and filter settings, allowing resonance in the mechanical train to be suppressed without sacrificing bandwidth.

Support for both rotary and linear motors reduces the number of different drive types required in a machine. The shared DC bus capability improves energy efficiency in multi axis systems. The consistent parameter structure across the Servo One range means that engineering data, commissioning knowledge and documentation remain valid when drive sizes change, which shortens project lead times and reduces training requirements.

Application Areas

The SO84.012.0002.0100.2 is used in machine tools for feed and spindle axes, in packaging machinery for film feed, cutting and sealing, in printing and converting equipment for register and tension control, and in handling and robotics systems for pick and place, gantry and rotary indexing tasks. It also appears in textile machinery, plastics processing equipment, woodworking machines and general automation systems where accurate and repeatable motion control is required.

Installation and Commissioning

Installation requires attention to cabinet ventilation, cable routing and shielding. The drive should be mounted vertically with sufficient clearance above and below for convection cooling. Motor cables must be shielded, with the shield bonded to ground at both ends over a large contact area. Feedback cables should be routed separately from power cables. DC bus connections between drives must follow the manufacturer instructions regarding fusing, precharging and cable length.

Commissioning begins with entering motor data, either manually or by selecting a stored dataset. The feedback system is checked for correct direction and resolution. The current loop is verified first, followed by tuning of the velocity and position loops. Fieldbus parameters, limit values, safety functions and fault responses are then configured and stored. A test run at reduced speed confirms correct direction, brake timing and limit switch behavior.

Maintenance and Diagnostics

The drive records fault codes and operating data that assist with troubleshooting. Maintenance consists of checking cabinet cooling, verifying terminal tightness, inspecting shield connections and cleaning the heatsink. Fan units should be replaced at the recommended service interval. Regular inspection of motor and feedback cables helps prevent intermittent faults caused by mechanical stress or contamination.

System Integration and Compatibility

The drive integrates into automation systems through its fieldbus interface or through conventional analog and digital signals. It can be combined with other Servo One drives on a shared DC bus and can operate in coordinated multi axis configurations. Because the parameter structure is common across the family, existing project data can be reused when the drive mix changes.

Selection Guidance

Selecting the correct variant depends on continuous and peak motor current, motor inductance, feedback type, required fieldbus protocol, safety requirements and available cabinet space. The 12 A rating of the SO84.012.0002.0100.2 suits medium sized servo motors and moderate to high inertia loads. For higher current requirements, other members of the same family provide larger ratings while retaining identical control functionality.

Conclusion

The LTi Drives SO84.012.0002.0100.2 combines a 12 A power stage, 400 V three phase operation and output frequencies up to 400 Hz with the proven control architecture of the Servo One platform. Its feedback flexibility, integrated safety functions, shared DC bus capability and consistent parameter structure make it a practical choice for a wide range of industrial motion applications. For engineers specifying or maintaining high performance servo systems, this drive represents a well understood and dependable component.