Product category:
Machine Safety Monitoring and Control
News Release from: Rockwell Automation Anorad | Subject: Allen-Bradley 825-P
Edited by the Engineeringtalk Editorial
Team on 09 February 2004
Modular protection for three-phase
motors
The Allen-Bradley 825-P modular protection system is a comprehensive yet cost effective addition to the company's overload protection range, ideal for monitoring the performance of three-phase motors.
The Allen-Bradley 825-P modular protection system is a comprehensive yet cost effective addition to the company's overload protection range, ideal for monitoring the performance of three-phase motors in low- and medium-voltage applications The 825-P offers greater functionality than the Allen-Bradley 193-E3, combining a high level electronic motor overload protection relay with comprehensive monitoring functions to measure motor current, temperature and voltage
With a current range from 0.5-5000A the device offers enhanced protection for process critical and essential motor applications, and is ideal for use in demanding environments such as the pharmaceutical and petrochemical industries, and other process critical environments where lengthy downtime is not an option.
The next generation 825-P provides full metering options for line voltage and power monitoring as well as expanded resistance temperature device (RTD) monitoring.
It is available as a stand-alone unit or with a range of option cards.
An I/O option card provides an easily configurable analogue output for motor current and thermal capacity, with four relay outputs providing local control.
In addition, a voltage option card offers full voltage metering and power monitoring helping to extend equipment life and prevent unnecessary and costly downtime.
Simple to install and compatible with most starter configurations, the 825-P can be easily adapted to suit a specific application and can be configured so that faults will trigger an alarm before tripping, giving users time to decide on appropriate action.
The full function device is ideal for monitoring phase currents, voltage imbalance and system frequency and includes a core balance current transformer to detect low-level ground faults from as low as 0.01A.
Standard features of the 825-P include thermal overload, undercurrent, overcurrent and earth fault protection to prevent short circuits.
Optional functions are also available, such as power factor, phase reversal, reactive overpower and underpower protection to alert the operator if voltage and current fall below a preset value.
A fibre-optic link measuring up to 500m can also be used to connect the module to a separate scanner so that the user can monitor up to 12 resistance temperature detectors.
Network enabled, the 825-P can be connected to popular networks including DeviceNet and Modbus for advanced control and monitoring.
An IP65 serial port has also been integrated into the front of the relay, allowing access to settings and parameters with Microsoft's Hyper Terminal program.
Operator input is simple using an onboard keypad, with a backlit two-line LCD that can be password protected to prevent unauthorised access and changes to the settings.
The screen can display motor load data and diagnostic information, including elapsed time, trip resets and the number of emergency starts.
Records of the five most recent trip events are also logged for reference and troubleshooting.
The new Allen-Bradley 825-P overload relay combines increased functionality with an easy-to-use interface.
Available as a stand-alone unit or with extra option cards, the 825-P is a cost effective solution for users wanting a high level of protection for any low and medium voltage application. Request a free brochure from Rockwell Automation Anorad ...
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