Lust LTi Drives CDB32.003C2.3 Servo Controller with UM-8I40
The Lust LTi Drives CDB32.003C2.3 is a servo controller from the CDB32 series, a product family developed by LUST Antriebstechnik and later marketed under the LTi Drives brand. The unit is supplied together with the LTi UM-8I40 interface unit, which provides additional input and output capacity for machine signal interfacing. The combination is designed for industrial motion applications that require accurate closed loop control together with a defined set of digital and analog machine signals.
The CDB32 series was developed for applications that require accurate speed and torque control in a compact and configurable package. The C2.3 configuration code identifies the control board variant and the interface options fitted at the factory. The associated UM-8I40 unit extends the signal interface capability of the drive, allowing it to connect to a wider range of machine sensors, switches and actuators without additional external equipment.
Product Overview
The CDB32.003C2.3 operates as a single axis servo controller. It converts a 230 V AC 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 UM-8I40 interface unit is connected to the drive and provides additional input and output channels. This allows the drive to receive command and monitoring signals from the machine and to control auxiliary devices such as brakes, indicators and interlocks. The combination of the drive and the interface unit simplifies the electrical design of the machine, because fewer separate components are required in the control cabinet.
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.
The UM-8I40 interface unit adds digital and analog input and output channels that can be configured to match the machine requirements. Inputs may be used for enable, limit switches, reference signals and sensor feedback, while outputs may be used for brake control, status indication and interlock signals. The interface unit is designed to work with the drive control electronics, so configuration and diagnostics are handled through the same parameter structure.
Technical Specifications
The CDB32.003C2.3 is designed for a 230 V AC 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. The UM-8I40 interface unit expands the available signal channels, which is useful in machines where many auxiliary functions must be monitored or controlled. Supported fieldbus protocols across the platform include CANopen, PROFIBUS, EtherCAT and others.
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 230 V AC supply design allows operation in machines where a 400 V three phase feed is not available, which simplifies electrical installation in smaller systems.
The addition of the UM-8I40 interface unit reduces the number of separate components required in the control cabinet, because signal conditioning and interface functions are integrated with the drive. This simplifies wiring, reduces panel space and improves diagnostic capability, since the state of all inputs and outputs can be monitored through the drive parameter interface.
Application Areas
The CDB32.003C2.3 with UM-8I40 is used in compact industrial machines and special purpose equipment. Typical applications include small machine tool axes, packaging and labelling units, handling and assembly stations, laboratory positioning systems, textile machinery and general automation installations where a 230 V AC supply is available and where additional signal interfacing is required.
Installation and Commissioning
Installation begins with verifying the mains voltage, the motor rating and the feedback type. The drive and the interface unit must be mounted with sufficient clearance 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, feedback and signal cables should be routed separately where possible 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. The input and output functions of the UM-8I40 interface unit are then configured according to the machine signal requirements, and the complete parameter set is 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. The interface unit should be inspected for secure mounting, tight terminals and correct signal levels. Fan units, where fitted, should be replaced according to the recommended service interval.
System Integration and Compatibility
The CDB32.003C2.3 integrates into automation systems through its fieldbus interface or through conventional analog and digital signals. With the UM-8I40 interface unit, it can connect to a wider range of machine signals without additional external equipment. 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.
Selection Guidance
When selecting this drive and interface combination, the key considerations are the available mains voltage, continuous and peak motor current, motor inductance, feedback type, required fieldbus protocol, the number and type of machine signals required and the available cabinet space. The CDB32.003C2.3 with UM-8I40 suits compact machines and installations where a 230 V supply is available and where additional signal interfacing is needed.
Conclusion
The Lust LTi Drives CDB32.003C2.3 together with the LTi UM-8I40 interface unit forms a practical solution for compact industrial motion applications that require precise closed loop control and flexible machine signal interfacing. The combination simplifies cabinet design, reduces wiring effort and maintains the control quality associated with the LUST LTi Drives platform. For engineers designing or maintaining such systems, this pairing remains a well understood and dependable choice.
