Lust LTI Drives CDA34.017.C2.CP Servo Controller 7.5 kW
The Lust LTI Drives CDA34.017.C2.CP is a 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 7.5 kW, placing it in the higher power segment of the CDA34 range. The ordering code identifies the power class, the control board variant C2 and the option code CP, which defines specific hardware and interface features fitted at the factory.
The CDA34 series was designed for industrial motion applications that require accurate closed loop control, flexible feedback support and straightforward integration into machine automation systems. The 7.5 kW rating makes this drive suitable for large servo motors, main spindle drives, heavy feed axes and applications where substantial acceleration forces must be generated within short cycle times.
Product Overview
The CDA34.017.C2.CP 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 drive is intended for cabinet mounting and can 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, improving energy efficiency and reducing the load on braking resistors. The high current capability of the 7.5 kW power stage supports motors with substantial continuous current requirements.
Key Features and Functional Highlights
Feedback support covers resolver, incremental encoder and absolute encoder interfaces, including high resolution serial protocols used with modern servo motors. 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 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. An internal brake chopper allows braking energy to be dissipated through an external resistor when the DC bus cannot absorb it, which 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. A dedicated output for a motor holding brake 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 CDA34.017.C2.CP is designed for a three phase mains connection in the 400 V class. Its 7.5 kW power stage suits large servo motors and high inertia loads. The output frequency range extends across a wide band, supporting both standard servo motors and high speed spindle applications. The DC link is accessible for shared operation, 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 modular configuration coding system means that a single base platform can be adapted to different feedback types and fieldbus systems by selecting the appropriate ordering code. This reduces the number of different drive types a machine builder needs to stock and maintain, and it simplifies documentation across a project.
Application Areas
The CDA34.017.C2.CP is used in machine tools for main spindle and heavy feed axes, in packaging machinery for high torque sealing and cutting stations, in printing and converting equipment for driven rollers and register control, and in handling and robotics systems for large gantry and rotary axes. It also appears in metal forming machinery, plastics processing equipment, textile machinery and test rigs where high current and precise control are required simultaneously.
Installation and Commissioning
Installation requires attention to cabinet ventilation, cable cross sections, 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. Because of the higher current rating, terminal torque values and cable sizing should be verified carefully.
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. In high current installations, periodic thermal imaging of terminals can help identify loose connections before they cause failures.
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 drives in the same family on a shared DC bus and can operate in coordinated multi axis configurations. Because the parameter structure is common across the CDA34 range, 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 7.5 kW rating of the CDA34.017.C2.CP suits large servo motors and high inertia loads. For lower power requirements, other members of the same family provide smaller ratings while retaining identical control functionality and parameter structure.
Conclusion
The Lust LTI Drives CDA34.017.C2.CP combines a 7.5 kW power stage with the proven control architecture of the CDA34 platform. Its feedback flexibility, shared DC bus capability and consistent parameter structure make it a practical choice for demanding industrial motion applications. For engineers specifying or maintaining high performance servo systems, this drive represents a well understood and dependable component.
