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Transducer-switch makes high-current loads easy to monitor

By Paul Dvorak | September 12, 2012

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The ATS Current Sensing Switch and Transducer is a one piece solution that combines a limit alarm with an analog output signal transducer to monitor produced or consumed ac current up to 1,200A, while magnetically isolating outputs and inputs to maximize safety.

The ATS Current Sensing Switch and Transducer is a one piece solution that combines a limit alarm with an analog output signal transducer to monitor produced or consumed ac current up to 1,200A, while magnetically isolating outputs and inputs to maximize safety. The innovative and patent-pending rotary switch makes it easy for users to set a trip point. DIN rail mounting simplifies installation and provides a secure attachment resistant to conductor movement.

“The ATS series is an invaluable preventive maintenance tool for anyone responsible for monitoring high ac-current loads. The development lets users monitor large loads with a single self-contained current switch, and the built-in analog signal helps identify bearing wear and other mechanical problems before they result in unplanned and costly downtime,” says NK Technologies President Philip Gregory. “What’s more, their function is matched by their ease of use. With the ATS Series all that is required for operation is to snap the unit onto a DIN rail, connect it to a power source, and connect the outputs to the controller.”

The wiring diagram shows how a 3-phase motor that turns a blower could be monitored with the current sensing switch.

In contrast, monitoring high-current loads often requires a current transformer sized for the maximum current that will be used and the 5A secondary of the current transformer is then connected to a shorting block for safety. The connection then runs from the shorting block to a signal conditioner to produce the analog output proportional to the current, or to a different type of signal conditioner to produce an alarm-relay contact. Once these connections are made, the controller can be connected to the signal conditioner outputs. It requires a great deal of time to interconnect these components, plus the time expended to adjust the signal outputs to match the primary load characteristics. Manufacturer NK Technologies offers no-cost test and evaluation units to qualifying OEMs.

NK Technologies
nktechnologies.com 

Windpower Engineering & Development


Filed Under: Bearings, Renewable energy, Safety systems + components
Tagged With: NK Tech
 

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