Flowserve 3400IQ Digital Positioner - Manual (Page 29)

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Logix 3400IQ Digital Positioner FCD LGENIM3402-00 – 0/07
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3. Connect the fieldbus cable shield (Fieldbus Cable Shield Connection). Normal practice for
grounding a fieldbus cable segment is that the cable shield should be grounded in only one place
— preferably a ground point at the power supply, intrinsically safe barrier or near the fieldbus
interface.
4. Replace end-cap, and tighten end-cap lock.
5. Connect a flat-braided wire to the external ground screw of the Logix 3400IQ digital positioner
housing.
6. Using the shortest length possible, connect the other end of the braided wire to a suitable earth
ground.
Lightning Protection
The Logix 3400IQ digital positioner contains moderate protection against near lightning strikes.
External lightning protection measures should be employed as needed.
Conduit Seal
Logix 3400IQ digital positioners installed as explosion-proof in a Class I, Division 1, Group A
Hazardous (Classified) Location in accordance with ANSI/NFPA 70, the US National Electrical Code
(NEC), require a ‘LISTED’ explosion-proof seal to be installed in the conduit, within 18 inches of the
Logix 3400IQ digital positioner.
Crouse-Hinds ® type EYS/EYD or EYSX/EYDX are examples of ‘LISTED’ explosionproof seals that
meet this requirement.
Logix 3400IQ digital positioners installed as explosion-proof in a Class I, Division 1, Group B, C or D
Hazardous (Classified) Locations do not require an explosion-proof seal to be installed in the conduit.
It is recommended that all seals installed on the Logix 3400IQ positioner provide an environmental
seal to keep moisture from entering into User Interface chamber of the positioner.
NOTE: Installation should conform to all national and local electrical code requirements.
CAUTION: Do not install in a Hazardous Location without following industry guidelines.
Electrical Wiring Summary
Verify polarity when making field termination connection. The Logix 3400IQ digital positioner is
reverse polarity protected. With a fieldbus power supply connected, verify that an LED is blinking to
determine if the electronics are running. Only one LED will blink at any given time.
Electrical Wiring Frequently Asked Questions
Question: My DCS uses 24VDC, can I run a Logix 3400IQ?
Answer: FF specifies a 9-32V operation range. A fieldbus compatible power supply with terminators
should be used. NOTE: The Logix 3400IQ is driven from a voltage source, not the typical 4-20 mA
supply.
Question: I accidentally reversed the voltage supply across the Logix 3400IQ digital positioner. How
do I know if I damaged something?
Answer: The Logix 3400IQ is reverse polarity protected. Inadvertent connection of the fieldbus supply
shouldn’t damage the unit.
Question: What is the input resistance of the Logix 3400IQ digital positioner?
Answer: The Logix 3400IQ digital positioner does not have a simple resistive input. This is because
the Logix 3400IQ digital positioner is an active device. The fieldbus specifications dictate that the