LTI DRIVES SO84.012.1030.0000.2 Servo Drive

The LTI DRIVES SO84.012.1030.0000.2 is a servo drive from the ServoOne series. It is rated at 8.3 kVA and 12 A for continuous operation. The drive is designed for precise closed loop control of servo motors in industrial machinery. Its modular design allows it to be combined with power supply modules, braking modules, and communication modules in multi-axis systems with a shared DC bus.

Series and Model Identification

The ServoOne series covers several current ratings and voltage classes so that machine builders can select a drive for each axis according to load requirements. The SO84.012 model represents a medium power class within the family. The remaining fields in the model code define the hardware revision and the option set. The drive is intended for cabinet mounting and for integration into systems that share a common DC bus and braking concept.

Control Architecture

The drive uses a cascaded control structure with a current loop, a velocity loop, and a position loop. The current loop regulates motor current with a short cycle time, producing fast torque response and low torque ripple. The velocity loop stabilises speed against load disturbances. The position loop uses feedback to close the position error and to ensure accurate stopping. Gains are adjustable, and several parameter sets can be stored for different machine modes.

Feedback Interfaces

Resolver feedback is supported for robust operation in harsh environments. Incremental encoders provide high resolution for accurate speed and position control. Absolute encoders allow the axis position to be known immediately after power up, which removes homing routines. Motor temperature sensors can be evaluated so that the drive reduces current when the winding approaches its thermal limit. Dual feedback configurations are possible where direct load measurement is required.

Power Section and DC Bus

The output stage converts DC bus voltage into controlled motor current. Protection circuitry monitors current, voltage, and temperature continuously. When several drives share a DC bus, braking energy from one axis can be used by another axis that is accelerating. This reduces the energy that must be dissipated in a braking resistor and improves overall system efficiency. The 12 A rating supports medium power servo motors and high inertia loads.

Input and Output Signals

Digital inputs handle enable, fault reset, and limit switch functions. Digital outputs report ready state and fault condition and can control a motor brake. Analog inputs accept external speed or torque references. Depending on the option set, a fieldbus or real time Ethernet interface may be available for cyclic communication with a higher level controller.

Protection and Diagnostics

Protection includes overcurrent limiting, short circuit detection, ground fault monitoring, overvoltage and undervoltage supervision, and overtemperature monitoring. Motor overload protection uses a thermal model based on the current profile. Faults are displayed on the front panel and stored in the fault history together with operating conditions. Trace functions in the engineering software allow current, speed, and position signals to be recorded and analysed.

Commissioning

Commissioning begins with entering motor data and feedback configuration. The drive then runs an identification routine to determine electrical parameters and initial control loop gains. The engineer refines the response using step response or frequency response analysis. Input and output functions are assigned, ramps are configured, and the parameter set is saved and backed up for service use.

Installation Practice

Mount the drive vertically with clearance for airflow. Use shielded motor cables and bond the shield to cabinet ground at both ends. Route feedback and signal cables separately from power cables. Verify that the DC bus and braking resistor wiring follows the specified cross sections and torque values. Confirm that cabinet cooling is sufficient for the total losses of all installed drives.

Applications

The drive is used in packaging machines, printing equipment, textile machinery, handling systems, and assembly lines. It is suitable for feed axes, positioning tables, rotary indexing units, and winding drives. The 8.3 kVA and 12 A ratings make it appropriate for medium power axes that require fast acceleration and accurate positioning.

Multi-Axis Integration

In multi-axis systems, ServoOne drives can share a common DC bus and power supply. This reduces wiring and allows energy exchange between axes. Braking energy from one axis can be used by another, improving efficiency. The drives can be synchronised through a real time communication network for coordinated motion.

Maintenance and Service

Inspect cooling paths and fans at scheduled intervals and clean dust from air inlets. Verify terminal tightness. Keep parameter and firmware records available so that a replacement unit can be restored quickly. Review the fault history to detect recurring overload or overvoltage events.

Selection Considerations

Match continuous and peak current to the motor and load. Confirm the DC bus voltage class and the feedback interface. Verify that the option set provides the required communication and input output functions. Consider the thermal environment and the total heat load in the cabinet when several drives are installed together.

Conclusion

The LTI DRIVES SO84.012.1030.0000.2 is a medium power ServoOne drive for precise motion control. It offers flexible feedback support, robust protection functions, and straightforward integration into multi-axis systems. With correct selection and commissioning, it delivers accurate and reliable motion in industrial machinery.