Article | October 31, 2011

Ultra-compact I/O terminal for servo motor control

Beckhoff Automation’s EL7201 servo terminal for the EtherCAT Terminal system integrates a complete servo drive for motors up to 200 W into a standard 12 mm I/O terminal housing, simplifying cabling and commissioning while reducing cabinet size requirements and costs.

By Gretchen Edelbrock, Products Editor

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The EL7201 servo terminal with resolver interfaces features an exceptionally compact design, while at the same time offers high servo performance. The integrated fast EtherCAT control technology, with field-oriented current and PI speed control, supports highly dynamic positioning tasks. In addition to the direct connection of a motor and resolver, the connection of a motor holding brake is also possible.

Permanent magnet synchronous motors with a rated current of up to 4 A can be connected as loads. The monitoring of numerous parameters, such as overvoltage and undervoltage, overcurrent, terminal temperature or motor load, offers maximum operational reliability. Modern power semiconductors guarantee minimum power loss and enable feedback into the DC-Link when braking.

The servo terminal is fully integrated into TwinCAT automation software from Beckhoff, enabling convenient parameterization. In the case of third-party masters, parameterization takes place via the CAN over EtherCAT profile (CoE).

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