Servax CDD34.008 Servo Drive Controller
The Servax CDD34.008 is a servo drive controller from Servax, a Swiss manufacturer specializing in electric motor and drive technologies. This device is part of Servax's automatic door control unit family, designed to manage the positioning, speed, and torque of motors used in automated door systems, gates, and light industrial positioning applications. The CDD34.008 combines a power stage, control logic, and system interface in a single enclosure, providing a compact and integrated solution for motion control in building automation and industrial access systems.
Electrical Specifications and Power Stage
The CDD34.008 operates from a three‑phase power supply of 400 V to 460 V AC, with a tolerance of +10 percent and -15 percent. The drive is designed to supply a rated output suitable for operating the Servax automatic door motors and compatible third‑party motors. The drive includes integrated rectification, DC bus filtering, and an inverter power stage using IGBT technology for efficient switching at the required switching frequencies. Power dissipation is managed through natural or forced convection depending on the specific installation and ambient temperature conditions.
Control Interface and Communication
The servo drive provides multiple input and output channels for interfacing with external sensors, switches, and machine controllers. General purpose digital inputs accept signals from door position sensors (magnetic reed switches, hall effect sensors, or optical sensors), safety edges, emergency stop buttons, and remote command stations. Relay outputs indicate drive status, fault conditions, and door position signals to external monitoring systems or alarm panels.
System Integration and Software
The CDD34.008 is programmed and configured using Servax DoorManager software, a PC‑based tool that provides intuitive navigation for drive parameterization. DoorManager allows machine builders to set acceleration and deceleration ramps, velocity profiles, torque limits, positioning targets, and safety response actions. The software also supports the storage and retrieval of configuration files, enabling identical setups to be replicated across multiple doors for consistent performance. When adjustments to machine design or door characteristics are required, DoorManager facilitates rapid modification of drive parameters without replacing hardware.
Safety Functions and Compliance
As a component of an automated door system, the CDD34.008 incorporates safety features such as torque monitoring, jam detection, and input for safety edges or light curtains. In the event of excessive force during door travel, the drive detects the torque rise, stops the motor, and optionally reverses direction to clear the obstruction. Emergency stop inputs can be wired to redundant safety circuits, and the drive provides a fault output that can be used to trigger external safety relays or shutdown logic. The device complies with relevant European machinery directives and carries CE marking for the intended application.
Motor Compatibility
The CDD34.008 is designed to be used with Servax NT series automatic door motors. The system includes the motor, drive controller, cable harness, and a shielded connection system for EMC compliance. The CDD34.008 can also be adapted for use with certain third‑party AC servo motors providing compatible voltage and current ratings. Power ratings for the CDD34.008 are indicated for continuous operation and short‑term peak loads encountered during door startup or stall conditions.
Environmental and Enclosure Specifications
The drive is typically installed within the header of the automatic door system or in an accessible electrical enclosure. The enclosure provides protection against dust and splashing water appropriate for indoor use, with field wiring connections made through cable glands or multi‑pin connectors. Operating temperature range is sufficient for typical building conditions, with derating required for installation in extreme heat or direct sunlight.
Maintenance and Diagnostics
The CDD34.008 includes built‑in diagnostic functions that monitor voltage, current, temperature, and communication integrity. LEDs on the drive face indicate power status, run state, fault condition, and optionally communication activity. In the event of a detected fault such as overcurrent, overvoltage, motor stall, or sensor failure, the drive enters a safe state and stores an error code. Service personnel can retrieve these codes using DoorManager software to diagnose issues and reduce repair time.
Applications
The primary application for the CDD34.008 is automatic sliding and swing door systems in commercial buildings, hospitals, airports, and industrial facilities. The drive also finds use in cleanroom doors, cold storage door automation, and specialized access systems where precise speed control and positioning are required. The compact integration of power electronics and control logic simplifies system design and reduces component count in the door operator assembly.
