LTi Drives Lust CDA34.017.W3.0 Control Unit 7.5 kW
The LTi Drives Lust CDA34.017.W3.0 is a control unit from the CDA34 series, a drive family developed by LUST Antriebstechnik and later marketed under the LTi Drives brand. This variant is rated at 7.5 kW and provides an output frequency range from 0 to 400 Hz. The unit operates with software version V3.70-04, which provides the control firmware functions, parameter management and diagnostic features used during commissioning and daily operation.
The CDA34 series was developed for industrial motion applications that require accurate closed loop control across a wide speed range. The combination of a 7.5 kW power stage and a 400 Hz output ceiling makes the unit suitable for both high torque feed axes and high speed spindle applications. The W3.0 configuration code identifies the control board variant and the interface set fitted at the factory.
Product Overview
The CDA34.017.W3.0 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 7.5 kW rating places the unit in the higher power segment of the CDA34 family. This makes it suitable for large servo motors, main spindle drives, heavy feed axes and applications where substantial acceleration forces must be generated within short cycle times. The unit is intended for cabinet mounting and can be installed alongside other drives in a multi axis arrangement.
Key Features and Functional Highlights
The 0 to 400 Hz output frequency range is a defining characteristic of this variant. It allows the drive to operate a motor at low speed with high torque, as required for positioning and holding tasks, and also at high speed for spindle or rotary cutting applications. The transition between low speed and high speed operation is handled by the control core, which maintains stable regulation across the entire range.
Feedback support covers resolver, incremental encoder and absolute encoder interfaces, depending on the configuration. 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 high inertia loads to be stopped quickly without overvoltage trips.
Technical Specifications
The CDA34.017.W3.0 is designed for a three phase mains connection in the 400 V class. Its 7.5 kW power stage provides high output current for large servo motors and high inertia loads. Output voltage is variable up to the level available from the DC link, and the output frequency extends from 0 to 400 Hz. The DC link is accessible for shared operation, allowing several drives to be connected to a common DC bus.
Software version V3.70-04 provides the parameter structure, control algorithms, monitoring functions and communication handling used by the drive. The software supports fieldbus communication, analog and digital signal processing, and the diagnostic memory that records fault events. Supported fieldbus protocols across the platform include CANopen, PROFIBUS, EtherCAT and others, depending on the option fitted.
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. The wide output frequency range allows one drive type to serve both positioning and high speed tasks, which reduces the variety of spare parts a machine builder must keep in stock.
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.
Application Areas
The CDA34.017.W3.0 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.
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 consistent across the CDA34 range, existing project data can be reused when the drive mix changes, and engineering documentation remains valid across the range.
Selection Guidance
Selecting the correct variant depends on continuous and peak motor current, motor inductance, feedback type, required fieldbus protocol, safety requirements, maximum operating speed and available cabinet space. The 7.5 kW rating and 400 Hz output ceiling of the CDA34.017.W3.0 suit large servo motors and applications that combine high torque with high speed. For lower power requirements, other members of the same family provide smaller ratings while retaining identical control functionality.
Conclusion
The LTi Drives Lust CDA34.017.W3.0 combines a 7.5 kW power stage, a 0 to 400 Hz output range and software version V3.70-04 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 control unit represents a well understood and dependable component.
