Lust LTi Drives CDD32.003.C2.0 Servo Controller and Positioning Controller
The Lust LTi Drives CDD32.003.C2.0 is a servo controller from the CDD32 series, a product family developed by LUST Antriebstechnik and later marketed under the LTi Drives brand. In German documentation the device is described both as a Servoregler, which emphasises its role in regulating motor speed and torque, and as a Positionierregler, which emphasises its ability to control axis position. The CDD32.003.C2.0 combines both functions in a single compact unit, allowing it to serve as a general purpose servo drive as well as a dedicated positioning controller.
The CDD32 series was developed for industrial motion applications that require accurate closed loop control in a compact and configurable package. The C2.0 configuration code identifies the control board variant and the interface options fitted at the factory, allowing machine builders to match the drive to the motor, feedback system and communication architecture of the machine.
Product Overview
The CDD32.003.C2.0 operates as a single axis servo controller with integrated positioning functionality. It converts a 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 position loop can be configured to accept command values from a higher level controller over a fieldbus, or from a pulse and direction interface, depending on the configuration. This allows the drive to function either as a simple slave axis or as a more autonomous positioning unit. The compact power stage suits small and medium sized servo motors used in positioning tables, feed rollers, tool changers and auxiliary axes.
Key Features and Functional Highlights
Feedback support covers resolver, incremental encoder and absolute encoder interfaces, depending on the configuration code. Absolute feedback is particularly useful in positioning applications because the drive knows the axis position immediately after power up, without a reference run. 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. 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, where the brake prevents the load from dropping when the drive is disabled.
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.
Technical Specifications
The CDD32.003.C2.0 is designed for industrial mains connection and provides an output suitable for small and medium sized servo motors. 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 so that braking energy from one axis can be reused by another.
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, where a central controller issues position commands, 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 positioning moves. This is particularly valuable in applications involving frequent start stop cycles or tight positioning tolerances. 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. This versatility reduces the number of different drive types a machine builder needs to stock and maintain. 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.
Application Areas
The CDD32.003.C2.0 is used in machine tools for feed and auxiliary axes, 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 and general automation systems where accurate speed and position control 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 CDD32.003.C2.0 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 CDD32 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 CDD32.003.C2.0 suits small and medium sized servo motors and moderate inertia loads. For higher current requirements, other members of the same family provide larger ratings while retaining identical control functionality and parameter structure.
Conclusion
The Lust LTi Drives CDD32.003.C2.0 is a servo controller and positioning controller that balances compact dimensions, flexible interfacing and precise closed loop control. Its configuration coding allows it to be tailored to specific machine requirements, while its diagnostic and monitoring features support reliable long term operation. For engineers maintaining or replicating industrial motion systems built around the LUST LTi Drives platform, this drive remains a relevant and well understood component.
