Rockwell Automation's Allen-Bradley E300 electronic overload relay provides motor monitoring and protection
Rockwell Automation's Allen-Bradley E300 electronic overload relay integrates communications, including EtherNet/IP, current-measurement technology, and I/O options.
The E300 overload relay’s native dual-port EtherNet/IP option is designed to simplify 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 Web browser to integrate the E300 overload relay from any Internet-enabled device without the need for special software. The E300 overload relay supports a device-level ring (DLR) network topology.
The E300 overload relay integrates into the Rockwell Software Studio 5000 control environment from Rockwell Automation via an add-on profile.
The E300 overload relay contains an embedded Allen-Bradley DeviceLogix logic engine with preprogrammed motor-control logic for local and remote motor operation. One cable connects the E300 overload relay to the operator station for local motor operation. The operator stations also support a copycat feature, which enables users to download pre-stored relay configurations at the push of a button.
The E300 overload relay offers a variety of digital and analog expansion I/O modules. The E300 digital expansion I/O modules provide four inputs and two relay outputs. Additionally, the relay’s analog expansion I/O modules allow users to select between traditional analog signals and a range of specific resistance temperature detectors (RTDs) embedded in the motor.
The E300 overload relay contains a current-sensing solution, which leverages Rogowski technology. This technology enables the E300 overload relay to remain the most compact architecture-class overload relay on the market, while still offering a wide 10:1 FLA range.
The E300 modularity – consisting of sensing, control and communication modules – provides users the flexibility to tailor the relay to meet their sensing, control and communication needs. The sensing module is available with a combination of current, voltage and ground-fault-sensing capabilities, as well as direct contactor mount, panel mount and pass-thru styles. The control module is available with variations of AC and DC digital inputs, as well as positive temperature coefficient (PTC) and ground-fault options. In addition, a variety of communication modules will enable the E300 overload relay to be used on EtherNet/IP and DeviceNet networks, and stand-alone applications.