The NewElec MA motor protection relay provides a means of upgrading existing motor starters. It permits them to be controlled by Profibus DP, eliminating the need of having to replace older MCCs, before gaining the benefit of automating via the two-wire field control, fieldbus technology, of which Profibus DP is but one.
With the MA motor protection and control relay, this is achieved by providing programmable field I/O in the form of four relay outputs and five digital inputs with a wide voltage range of 24 V to 240 V a.c./d.c. The inputs can be configured as a common bus type input as in standard PLC applications, alternatively, the neutral of field supply for the MA's digital inputs can be connected to the existing auxiliary power supply neutral. Connecting a voltage signal to any of the digital inputs will be seen as an active signal.
The original control wiring remains intact with very little additional wiring being added, to link the MA closing and tripping relays into the closing and tripping circuits. The wiring from the MA digital inputs to the control interlocks needs to be monitored via the PLC or scada system.
Additional features such as actual load current, thermal capacity available in motor, alarm and trip flags for all fault conditions, running hours counter, time and date stamping of last four faults can be extracted via Profibus DP communications.
All configuration and parameterisation of the MA relay on Profibus DP is done using the PLC vendor configuration and parameterisation software. This incorporates the MA's GSD file into the vendor PLC device library to identify all the features of the MA relay to the specific PLC or scada system under Profibus DP.
The NewElec MA motor protection relay via an RS232 port running NewElec propriety free-issue software is able to record the three-phase currents, line voltage and phase voltage at 1 s intervals. The resultant text file is exported to Excel for analysis, with a typical file size of 7 MB for a 24 h period of recording. This feature has proved invaluable in monitoring load currents in mining equipment in flameproof enclosures allowing the identification of load related problems that have been plaguing the operation and engineering staff in the coal mining industry. Older P1 type laptops are ideally suited for the task, allowing one to find an economical solution to field measurement in harsh environments.
Precise information in the cockpit with FAULHABER stepper motors
Motion Control & Drives
For the display of Bugatti’s upcoming luxury model, Tourbillon, something truly special will be presented. Instead of a digital version, the driver will see a genuine Swiss timepiece behind the steering wheel.
Read more...Complete mine hoist systems
Motion Control & Drives
From friction to single and double drum hoists, ABB is a complete supplier of various types of mine hoist systems.
Read more...Innovative braking technology for heavy-duty hoists
Motion Control & Drives
The electro-hydraulic disc brakes in the DX series from RINGSPANN have been re-engineered, and are proving to be a trendsetter in the holding and emergency stop systems in the hoists of heavy-duty and container cranes.
Read more...These robots crawl into every nook and cranny DNH Tradeserve t/a DNH Technologies
Motion Control & Drives
Inuktun's small crawler robot magnetically sticks to metal walls and is able to move in all directions. It carries cameras, sensors and tools for inspection or maintenance work in tight pipes and on the outer hulls of tanks or ships. All crawler modules and cameras are equipped with brushed DC motors from Swiss drive specialist, maxon using various motor-gearhead combinations.
Read more...Proven drive technology solutions for the sugar industry SEW-EURODRIVE
Motion Control & Drives
As the South African sugar industry continues to optimise efficiency, uptime and sustainability across cane handling, processing and refining, SEW-EURODRIVE is helping drive this momentum with its world-class drive technology and local service support.
Read more...The environmental benefits of correct lubrication storage
Motion Control & Drives
While selecting the right lubricant for an application is key, how that lubricant is stored between applications is an often overlooked but critical aspect of reducing contaminants in machinery across a plant or site.
Read more...Sustainability is transforming fluid power
Editor's Choice Motion Control & Drives
Sustainability is reshaping the future of fluid power. With the growing demand for cleaner, more efficient technologies and tightening global regulations, fluid power systems are being re-engineered for higher efficiency, lower emissions and reduced material usage.
Read more...Demystifying demulsifier additives Wearcheck
Motion Control & Drives
Water is one of the most destructive contaminants in lubricants. Demulsifier additives prevent the formation of a stable oil-water mixture or an emulsion by changing the interfacial tension of the oil so that water will coalesce and separate more readily from the oil.
While every effort has been made to ensure the accuracy of the information contained herein, the publisher and its agents cannot be held responsible for any errors contained, or any loss incurred as a result. Articles published do not necessarily reflect the views of the publishers. The editor reserves the right to alter or cut copy. Articles submitted are deemed to have been cleared for publication. Advertisements and company contact details are published as provided by the advertiser. Technews Publishing (Pty) Ltd cannot be held responsible for the accuracy or veracity of supplied material.
printer friendly version