Electronic overload relay promises productive motor monitoring and protection

06 May 2014

Rockwell Automation has developed the new Allen-Bradley E300 electronic overload relay which integrates communications, including EtherNet/IP, current-measurement technology, and time-saving I/O options, in a modular design.

The modularity of the electronic overload relay is said to offer the flexibility to tailor the device to meet exact requirements.
“Adoption of electronic-overload-relay technology has risen over the past decade and so have practical expectations,” explained Bill Martin, global product manager, Rockwell Automation. “Customers have told us that they value the technology’s remote monitoring and predictive trip alerts, but they also want designs that simplify programming, preserve network nodes, save wiring time, ease maintenance and minimise catalogue numbers.”

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 E300 overload 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 relay integrates into the Rockwell Software Studio 5000 control environment from Rockwell Automation via an add-on profilewhich means that users are only five mouse clicks away from communicating data between the device and a Logix controller.
The overload relay also contains an embedded DeviceLogix logic engine with pre-programmed motor-control logic for local and remote motor operation which is said to simplify device integration. One cable connects the 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.
A variety of digital and analogue expansion I/O modules are also available, enabling users to maximise the relay’s capability, all within a single network node.

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