KOLLMORGEN Digifas-7200 Digital Servo Amplifier Application Guide

Digifas ™  The 7200 series digital servo amplifier is a key driving component in the field of industrial automation, designed specifically for controlling synchronous servo motors. It is widely used in high-precision motion control systems such as machine tools, packaging machinery, and printing equipment. This article is based on the official product manual, combined with technical details and practical applications, to comprehensively analyze the functional characteristics, installation specifications, parameter configuration, and maintenance points of this series of amplifiers, aiming to provide systematic reference materials for engineers and technicians.

Product Overview and Series Classification

Digifas ™  The 7200 series adopts a fully digital design and supports direct connection to 400V three-phase industrial power grids without the need for additional transformers. It has the characteristics of compact structure, fast response, and high control accuracy. This series offers multiple versions to meet different control requirements:

Standard version: Equipped with simulated speed setting input, incremental position output, and controllable motor holding braking function, suitable for systems with external position control.

BIT CONNECT version: Integrated PLC interface, connected to a simple controller through 10 I/O channels, supports internal storage of motion datasets, and achieves position control function.

PULSE CONNECT version: Provides pulse direction interface, can be used as a stepper motor controller or slave station, supports cascaded position control.

PROFIBUS CONNECT version: compatible with the PROFIBUS-DP protocol and suitable for integrated bus control systems.

CAN CONNECT version: Supports CAN bus communication and is suitable for distributed motion control networks.

Each version offers optional options, such as the "- IL -" controllable torque limiting module and the "- BV -" forced air cooling module, to expand application flexibility.

Technical specifications and design features

2.1 Power Supply and Output Characteristics

Digifas ™  The 7200 series directly supports 3 × 80-400V AC power input, with a rated intermediate circuit voltage of 560V DC. The output current range covers 1.5A to 6A (effective value), and the peak current can reach twice the rated value. The IGBT output stage adopts a switching frequency of 8.33kHz, and the current controller bandwidth reaches 1kHz, ensuring fast dynamic response.

2.2 Control Interface and Signal Processing

The amplifier is equipped with differential analog setting input (± 10V, 14 bit resolution) and supports speed or torque control modes. All digital control inputs are isolated by optocouplers and compatible with 24V PLC levels. The system provides multiple grounding references (AGND, DGND, XGND, PGND) to achieve signal isolation and anti-interference.

2.3 Braking and Energy Feedback Processing

The built-in braking circuit is used to process the feedback energy of the motor, and automatically connects to the braking resistor when the intermediate circuit voltage exceeds 720V. The power of the braking resistor varies depending on the model (75W or 140W), and supports parallel connection of multiple amplifier intermediate circuits to share braking energy. In addition, the amplifier can directly control the 24V motor to maintain braking and has braking timing management function.

2.4 Environmental and Mechanical Requirements

The working environment temperature is 0-45 ℃ (rated value), and 45-55 ℃ needs to be downgraded for use. The protection level is IP20, suitable for installation in electrical cabinets. During installation, it is necessary to ensure vertical placement and leave sufficient space for heat dissipation. Long cables (>25m) require an external motor reactor (such as 3YL-06) to suppress capacitive reactive current.

Installation and wiring specifications

3.1 Safety Notice

Installation and commissioning must be carried out by professionals with electrical qualifications. Before operation, ensure that the power is completely disconnected and wait for at least 2 minutes after the power is cut off. Only when the voltage of the intermediate circuit is below 40V can the terminals be contacted. The amplifier contains static sensitive components, and the operator needs to take anti-static measures.

3.2 EMC and Grounding Design

To comply with the requirements of the EC EMC Directive (89/336/EEC), shielded cables must be used and large-area low impedance grounding must be implemented. The manual recommends using shielded terminal clips, metalized connector housings, and grounding motors, filters, control cabinet mounting plates, etc. to the same potential. The power line and signal line should be laid separately, with a recommended spacing of more than 20cm.

3.3 Wiring Examples and Multi Axis Systems

The manual provides standard wiring diagrams for different motor series (6SM27/37/47/57/77 and 6SM45/56), covering connections for main power supply, control signals, encoders, brakes, etc. In a multi axis system, each amplifier can share an intermediate circuit, but it needs to be grounded uniformly and the braking power should be configured reasonably.