Monitoring relays take control
A
Tele Control product story
Edited by the Engineeringtalk editorial team
May 9, 2003
The new WatchDog family of sensing and monitoring relays includes devices for monitoring temperature via PTC, phase sequence and loss as well as current and voltage.
The new WatchDog family of sensing and monitoring relays includes devices for monitoring temperature via PTC, phase sequence and loss as well as current and voltage.
A host of innovative features brings new levels of user friendly flexibility such as automatic measuring range selection, plug-in power modules for different power supply voltages, the clear display of operating status for easy commissioning and space saving compact design.
This makes the relays an ideal solution for a wide range of building and industrial automation applications.
Configuration of the devices is simply done using a screwdriver to precisely adjust the potentiometers, located at the front for optimum access.
A sealable front cover reduces the risk of tampering.
With a comprehensive range of power modules from 24 to 400V AC one WatchDog device can be easily matched to the power supply.
Maintenance is simplified as power modules can be replaced without removing the entire relay unit.
Voltage monitoring relays in the family are available for single and three-phase voltage supplies with the three-phase types accepting three- or four-wire systems.
Clear status indication of supply voltage, relay position, threshold, asymmetry and broken neutral wire, and phase sequence failure is signalled via individual LEDs.
The devices' compact 90 x 22.5 x 103mm housing is an advantage in space critical applications.
This combined with easy mounting aids quick installation and commissioning.
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