Flowserve 420 IOM - Manual (Page 14)

User Instructions - Logix® 420 Series Digital Positioners FCD LGENIM0106-06 12/13
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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 1/2" 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.
Figure 9: Local User Interface
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
LED
Status
Lights
QUICK-CAL/
ACCEPT
Button
(Move Right)
UP Button
DOWN Button
Selectable
GAIN
Switch
Configuration
Switches
BACK
Button
(Move
Left)
HART
4-20
mA
Input