Logix
®
420 Digital Positioner FCD LGENIM0106-07-AQ – 10/15
14
7.2.3 Intrinsically Safe Barriers
When selecting an intrinsically safe barrier, make sure the barrier is
HART compatible. Although the barrier will pass the loop current and
allow normal positioner control, if not compatible, it may prevent HART
communication.
7.2.4 Grounding and Conduit
The grounding terminal, located by the electrical conduit port should
be used to provide the unit with an adequate and reliable earth ground
reference. This ground should be tied to the same ground as the
electrical conduit. Additionally, the electrical conduit should be earth
grounded at both ends of its run.
This product has electrical conduit connections in a thread size of ½"
NPTF. Conduit fittings must match equipment housing threads for
installation.
NOTE: The grounded screw must not be used to terminate signal shield
wires. Shield wires should be terminated only at the signal source.
7.2.5 Electromagnetic Compatibility
The Logix 420 digital positioner has been designed to operate correctly
in electromagnetic (EM) fields found in typical industrial environments.
Care should be taken to prevent the positioner from being used in
environments with excessively high EM field strengths (greater than
10 V/m). Portable EM devices such as hand-held two-way radios should
not be used within 30 cm of the device.
Ensure proper wiring and shielding techniques of the control lines, and
route control lines away from electromagnetic sources that may cause
unwanted electrical noise. An electromagnetic line filter can be used to
further eliminate noise (FLOWSERVE Part Number 10156843).
In the event of a severe electrostatic discharge near the positioner, the
device should be inspected to ensure correct operability. It may be
necessary to recalibrate the Logix 420 positioner to restore operation.
7.3 Connections for Intrinsically Safe Operation
For intrinsically safe connections, see entity parameters in section 3
HAZARDOUS AREA CERTIFICATIONS. If a control drawing is required,
ask your Flowserve representative for drawing 314746 - CONTROL
DRAWING, LOGIX 420 DIGITAL POSITIONER.
Display
HART
4-20 mA
Input
UP Button
DOWN Button
QUICK-CAL/
ACCEPT Button
(Move Right)
LED Status
Lights
Selectable
GAIN Switch
Configuration
Switches
BACK
Button
(Move
Left)
Figure 9: Local User Interface
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