Fieldbus device couplers reduce specification effort for systems integrators and wiring workload for field installers, by enabling fast and easy connection/disconnection of Foundation Fieldbus and Profibus-PA devices into fieldbus segments.
Device Couplers are complete packages based on IP66 field enclosures complete with cable glands as specified to suit field wiring, and the easiest way to implement fieldbus effectively and without problems. TG200 units inside provide electronic and auto-resetting short-circuit protection, with automatic segment termination, for 4, 8 or 10 fieldbus devices.
Hawke's Trunkguard technology for electronic short circuit protection is designed differently to most vendors: on detection of excess spur current, the unit reacts immediately to switch spur current to a nominal trickle-level rather than simply limiting that fault current to a fixed (and always higher) level.
So-called 'current-limiting' circuits actually maintain high spur currents without clearing the fault, which can overload the segment power supply and lead to random device disconnections or even whole segment failure.
TG units provide automatic segment termination via unique 'end-of-line' sensing circuits. At a stroke, this feature eliminates the most common installation error; under/over termination. The Hawke TG Series further accelerates field commissioning by providing easy access points for hand-held communicators.
Hazardous area approvals allow TG installation in Div 2 and Zone 2, typically for use with non-incendive devices. Standalone TG-DIN units can also be supplied for fitting (by others) into alternative enclosures meeting the overall requirements of the intended area of use. Segment power needs to be provided by a suitable fieldbus conditioned power supply and the Hawke FPS200 Series is recommended, providing 350 mA per segment, DC supply redundancy and high availability.
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