3
TRUNKGUARD™
Series Fieldbus Device Couplers
(Zone 1 Locations)
TG300
Introduction
Device Couplers provide easy and practical
mechanisms for implementing fieldbus systems.
TRUNKGUARD Series 300 Device Couplers (TG300)
simplify the use of fieldbus devices in Zone 1 by
allowing “live” access for maintenance and eliminating
the need for Exd junction boxes.
The TG300 Series offers our patented Automatic
Segment Termination feature and a key-operated
magnetic interlock which permits one spur at a time to
be de-energized and worked on without shutting down
the entire segment.
TRUNKGUARD Device Couplers provide electronic
and fully auto-resetting spur short-circuit protection
that prevents a segment failure that maybe caused by
a short circuit to any field device. Utilizing a unique
“Fold-Back” technique, any spur that attempts to draw
more than 48mA is automatically switched off and not
permitted any current flow until the fault is removed.
With removal of the spur short circuit, TRUNKGUARD
automatically reconnects the spur to the fieldbus
segment within 20 microseconds.
The Automatic Segment Termination feature
eliminates segment failure from under or over
termination which is generally the most common
cause for delay in starting up fieldbus projects. The
auto-terminator also assures that local parts of a
segment will continue to function even if there is a
downstream cable break.
About this Manual
Wherever you see a “
Note
”, “
Caution
” or “
WARNING
”
pay particular attention.
WARNING
- Hazardous procedure or condition that
could injure the operator.
Caution
- Hazardous procedure or condition that could
damage or destroy the unit.
Note
- Information that is helpful for a procedure,
condition, or operation of the unit.
DIN Units
TG300-DIN units are designed to fit onto a 32mm
(EN50035) G-type and 35mm (EN50022) Top Hat
DIN-rail and may be mounted at any angle and in
such a way as to allow easy access to terminal
receptacles and to keep LEDs visible. These units are
not weatherproof and outdoor placement will require
an external enclosure. Any enclosure which meets
the requirements of the location in relation to electrical
and mechanical safety may be used.
For Zone 1 applications an external enclosure is
required. The enclosure and glands must be certified
for increased safety and suitable for Zone 1 use,
IP64 protection minimum. All MooreHawke TG300
enclosures are suitable for Zone 1.
Device Coupler Enclosures
Standard enclosures are available in GRP (Glass
Reinforced Polyester with side-entry cable glands).
These enclosures provide IP66/NEMA Type 4X
protection.
Standard cable glands are nickel-plated brass, and
can be ordered for use with un-armored or armored
cable. Compound seal glands (for cable with inter-core
spaces, i.e., unfilled cable), and quick connect plugs
and sockets are also available. Field devices are
individually connected directly to terminals via spur
cables through a variety of cable gland options.
Installation
The enclosure should be mounted to a flat surface
using the internal mounting holes or via external
Содержание Hawke TRUNKGUARD Series
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