LUST LTI Drives CDA34.003.C3.0 Servo Controller 0.75 kW
The LUST LTI Drives CDA34.003.C3.0 is a compact servo controller from the CDA34 series, a product family developed by LUST Antriebstechnik and later marketed under the LTi Drives brand. This variant is rated at 0.75 kW, placing it in the low power segment where small dimensions, precise control and economical operation are the primary requirements. The CDA34 platform was designed for industrial motion applications that need accurate closed loop control and flexible integration into machine automation systems.
The CDA34 series shares a common control architecture with other LUST LTi Drives families. Parameter structures, commissioning workflows and diagnostic functions remain consistent across different power ratings. For machine builders, this means that engineering data can be reused when drive sizes change, and maintenance teams can work across multiple axes without relearning the toolchain.
Product Overview
The CDA34.003.C3.0 operates as a single axis servo controller. It converts a three phase mains supply into a controlled output voltage and frequency that drives a servo motor. The internal power stage uses pulse width modulation with a high switching frequency, producing smooth current waveforms, low torque ripple and quiet motor operation. The control core executes current, velocity and position loops in a closed cascade, with each loop independently tunable to match the mechanical characteristics of the connected load.
The 0.75 kW rating makes this drive suitable for small servo motors used in auxiliary axes, positioning tables, feed rollers, tool changers and compact handling units. The unit is intended for cabinet mounting and can be installed alongside other drives in a multi axis arrangement. Because the housing is compact, several units can be placed side by side in a control cabinet, which is convenient in machines with many small axes.
Key Features and Functional Highlights
Feedback support covers resolver, incremental encoder and absolute encoder interfaces, depending on the configuration code. Automatic commutation detection reduces commissioning effort when the motor and drive are paired for the first time. Parameter sets can be stored internally and transferred between units, which simplifies machine replication and spare parts handling.
Integrated monitoring functions continuously evaluate current, voltage, temperature and following error. When a limit is exceeded, the drive triggers a defined fault response and disables the output stage, protecting the motor and the mechanical system. Braking energy generated during deceleration can be dissipated through an external braking resistor connected to the DC link, allowing moderate inertia loads to be stopped quickly without overvoltage trips.
Digital and analog inputs and outputs provide fast interfacing with machine signals such as enable, limit switches, reference pulses and brake control. A motor holding brake output is available for vertical axes. The unit is protected against overcurrent, overvoltage, undervoltage and overtemperature conditions, and it includes an electronic motor overload model that estimates winding temperature without additional sensors.
Technical Specifications
The CDA34.003.C3.0 is designed for a three phase mains connection in the 400 V class. Its 0.75 kW power stage suits small servo motors and low to moderate inertia loads. The output frequency range extends across a wide band, supporting both standard servo motors and higher speed applications. The DC link is accessible for shared operation in suitable configurations, allowing several drives to be connected to a common DC bus.
Communication with the higher level controller is handled through a fieldbus interface or through conventional analog and digital signals, depending on the configuration. Supported fieldbus protocols across the platform include CANopen, PROFIBUS, EtherCAT and others. This flexibility allows the drive to be used both in centralized motion architectures and in decentralized architectures where the drive performs positioning tasks locally.
Performance and Advantages
Short current loop cycle times produce fast response to torque commands and minimize following error during dynamic moves. The velocity loop can be tuned with adjustable gain, integral time and filter settings, so that resonance in the mechanical train can be suppressed without sacrificing bandwidth. Because the drive supports both rotary and linear motors, it can be applied to direct drive axes as well as conventional geared arrangements.
The compact housing reduces cabinet volume, and the consistent parameter structure across the CDA34 range means that engineering data can be reused when additional axes are added to a machine. This reduces project lead times and simplifies spare parts planning.
Application Areas
The CDA34.003.C3.0 is used in machine tools for auxiliary axes and tool changers, in packaging machinery for film feed and sealing stations, in handling systems for pick and place units, and in printing and converting equipment for register and tension control. It also appears in textile machinery, plastics processing equipment, laboratory automation and general automation systems where compact size and accurate positioning are required.
Installation and Commissioning
Installation begins with verifying the mains voltage, the motor rating and the feedback type. The drive must be mounted vertically with sufficient clearance above and below to allow convection cooling. Shielding of the motor cable is essential for electromagnetic compatibility, and the shield should be bonded to the cabinet ground at both ends using a large contact area. Motor and feedback cables should be routed separately from mains and signal cables to reduce interference.
Commissioning typically starts with entering the motor data, either manually or by selecting a stored motor dataset. The feedback system is then checked for correct direction and resolution. After the current loop is verified, the velocity and position loops are tuned using step response tests or automatic tuning routines. Finally, the fieldbus parameters, limit values and fault responses are configured and stored in non volatile memory.
Maintenance and Diagnostics
The drive includes a diagnostic memory that records fault codes, operating hours and critical parameter values at the moment of a trip. Regular maintenance consists of checking cabinet cooling, verifying terminal torque, inspecting cable shields and clearing dust from heatsink fins. Fan units, where fitted, should be replaced according to the recommended service interval.
System Integration and Compatibility
The CDA34.003.C3.0 integrates into automation systems through its fieldbus interface or through conventional analog and digital signals. It can be combined with other drives in the same family on a shared DC bus, and it supports master slave torque distribution for mechanically coupled axes. Because the parameter structure is consistent across the CDA34 range, engineering effort can be reused when additional axes are added to a machine.
Selection Guidance
When selecting this drive, the key considerations are continuous and peak motor current, motor inductance, feedback type, required fieldbus protocol and the available cabinet space. The 0.75 kW rating of the CDA34.003.C3.0 suits small servo motors and low inertia loads. For higher power requirements, other members of the same family provide larger ratings while retaining identical control functionality and parameter structure.
Conclusion
The LUST LTI Drives CDA34.003.C3.0 is a compact servo controller that delivers precise closed loop control in a small package. Its 0.75 kW power stage, flexible feedback support and consistent parameter structure make it suitable for a wide range of auxiliary and positioning axes. For engineers designing or maintaining compact motion systems, this drive remains a practical and well understood component.
