Operator Interfaces, Switches & Relays


New Siemens monitoring relays increase plant availability

July 2006 Operator Interfaces, Switches & Relays

Three new Sirius monitoring relays of the 3UG4 series supplement the product range of Siemens Automation and Drives (A&D) and increase the availability of machines and plants as the devices are available in versions for single-phase voltage monitoring, single-phase current monitoring, as well as monitoring of cos phi and active current on motors.

The relays have a switchable fault memory and can detect violation of the digitally adjustable upper and lower limit values. The display constantly indicates the actual value and the type of fault, and thanks to the wide voltage range, can be used worldwide.

The device version for cos phi and active current monitoring is suitable for running motors well below the rated torque, as in no-load operation of a pump, for example. Active current measurement and monitoring for violation of upper and lower limits facilitate advance maintenance information, so plant availability can be increased. It is possible to choose between the cos phi and active current measuring principles.

For more information contact Keshin Govender, Siemens Southern Africa, +27 (0)11 652 2412, keshin.govender@siemens.com, www.siemens.co.za



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