Flowserve 400MD Logix - Manual (Page 22)

2. Feed fieldbus cable through one of conduit entrances on either side of electronics housing. Plug whichever entrance not used.
CAUTION: The Logix 3400MD digital positioner accepts up to 16 AWG (1.5 mm diameter) wire.
Figure 5.6 Logix 3400MD Digital Positioner Terminal Block
3. Check ground on 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 3400MD 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 3400MD digital positioner contains moderate protection against near lightning strikes. External lightning protection measures
should be employed as needed.
Conduit Seal
Logix 3400MD digital positioners installed as explosion-proof in a Class I, Division 1, Group B 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 3400MD
digital positioner.
Crouse-Hinds ® type EYS/EYD or EYSX/EYDX are examples of ‘LISTED’ explosionproof seals that meet this requirement.
Logix 3400MD 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 3400MD 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 3400MD 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. Refer to guidelines in FF AG-181
for proper wiring and segment checkout methods.
Electrical Wiring Frequently Asked Questions
Question: My DCS uses 24VDC, can I run a Logix 3400MD?
For reference purposes
Logix 3400MD Digital Positioner LGENIM3405-02 11/13
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