Monitoring relays provide protection for motors
A
Finder product story
Edited by the Engineeringtalk editorial team
Aug 26, 2003
A range of monitoring relays can protect motors and other equipment against electrical supply or temperature variations outside fixed or adjustable limits.
For use in industrial applications, Finder's 71 Series monitoring relays are designed for the protection of motors and other equipment against electrical supply or temperature variations outside fixed or adjustable limits.
The relays not only safeguard valuable equipment, but also ensure uninterrupted service and/or production, maintaining plant availability and revenue generation.
Offering versatility, the 71 Series includes models for single- and three-phase line voltage monitoring, programmable universal AC/DC voltage and current detection and monitoring, three-phase asymmetry monitoring, and thermistor relays.
Contacts are rated at 10A, with a maximum peak current rating of 15A.
For use in ambient temperature of -20 to +55C, the range is environmentally protected to IP20.
The 71 Series features a positive safety logic whereby the devices configure a safe condition in the event of a failure.
A fault memory avoids dangerous restart on removal of a fault condition, and high precision adjustable limits provide accurate control and the avoidance of nuisance tripping.
The units feature LED or LCD status indication for quick, visual confirmation of status.
The versatile range offers models from single function, fixed limit devices, through to universal programmable models to meet all needs.
The use of industry standard 35mm rail mounting ensures compatibility with associated components for ease of manufacture and deployment.
Aimed at machine and equipment builders, the 71 Series' most important application areas are for the protection of machines and control systems against failure or unacceptable variation of mains supply, and the protection of electric motors against over-temperature of motor windings.
Factors driving the demand for this type of product are the need to protect valuable equipment and to minimise down time, particularly in unmanned or remote installations.
Providing a commercial or economic advantage, the devices facilitate the possibility to use the smallest electric motor for a given application, safe in the knowledge that it is protected against burnout.
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