A next-generation electronic overload relay from Rockwell

The E300 integrates communications, including EtherNet/IP, patented current-measurement technology, and time-saving I/O options, all in a modular design that gives users the flexibility to tailor the device to meet their specific requirements.

The E300 overload relay’s native dual-port EtherNet/IP option simplifies network wiring by allowing E300 overload relays to be daisy-chained and by eliminating the need for an Ethernet switch.

The relay also provides an embedded Web server, which allows maintenance personnel to use a simple Web browser to integrate the E300 overload relay from any Internet-enabled device without the need for special software. To maintain uptime in the event of a network node interruption, the E300 overload relay supports a device-level ring (DLR) network topology.

The E300 easily integrates into the Rockwell Software Studio 5000 control environment via an add-on profile. This integration brings users five mouse clicks away from communicating data between the device and a Logix controller.

The relay contains an embedded Allen-Bradley DeviceLogix logic engine with pre-programmed motor-control logic for local and remote motor operation, simplifying device integration into an automation system.

One cable connects the E300 overload relay to the operator station for local motor operation, eliminating the traditional hard-wiring time and costs, and consumption of discrete input points on the device.

To ease swapping of E300 overload relays, the operator stations also support a copycat feature, which enables users to download pre-stored relay configurations at the push of a button.

A variety of digital and analogue expansion I/O modules is offered, enabling users to maximise the relay’s capability, all within a single network node. The E300 digital expansion I/O modules provide four inputs and two relay outputs, making it suitable for complex starter scenarios where users require more inputs and outputs than provided in the base overload.

Additionally, the relay’s analogue expansion I/O modules allow users to select between traditional analogue signals and a range of specific resistance temperature detectors (RTDs) embedded in the motor. Combining the ability to receive both traditional analogue signals and RTD sensor signals in one device is believed to be an industry first.