Woodward GECO, Техническое руководство, Страница: 63 / 90

Manual 03554 GECO

Stoichiometric
Woodward 55
Class I, Division 2, Groups A, B, C, D Hazardous
Locations
See Regulatory Compliance page for listing details for marked controls.
Installation wiring must be in accordance with Class I, Division 2
wiring methods in Article 501-4(b) of the NEC, and in accordance
with the authority having jurisdiction. Due to the hazardous location
listings associated with this product, proper wire type and wiring
practices are critical to operation.
EXPLOSION HAZARD—Substitution of components may impair
suitability for Class I, Division 2.
Do not connect or disconnect equipment while circuit is live unless
the area is known to be non-hazardous.
Wiring Installation
This wiring should not run in the same conduit as wiring carrying alternating
current or high voltage wiring signal wire. Any new alarm and shutdown wiring for
the operator control panel such as switches, lights, horn, or gages should also be
installed at this time. The GECO enclosure should be properly connected to earth
ground.
Making Electrical Connections
External wiring connections and shielding requirements for control installation are
shown in the Plant Wiring Diagram. Shielded cable with spiral wrapped foil and a
separate twisted shield wire or braided shield cable is recommended for all
sensor input, control output, and communications wiring.
Shielded Wiring
All shielded cable must be twisted-conductor pairs. Do not attempt to tin the
twisted shield wire. All signal lines should be shielded to prevent picking up stray
signals from adjacent equipment. Connect the shields to the indicated terminals
on the Plant Wiring Diagram. Wire exposed beyond the shields should be as
short as possible. The sensor end of the shields must be left open and insulated
from any other conductor. DO NOT run shielded signal wires along side or in the
same conduit with other wires carrying large currents.