Logix
®
Digital Positioners FCD LGENIM0110-0 05/16
flowserve.com
25
Additionally, the electrical conduit should be earth
grounded at both ends of its run.
NOTE:
The grounded screw must not be used to
terminate signal shield wires. Shield wires should be
terminated only at the signal source.
This product has electrical conduit connections in either
thread sizes 1/2" NPTF or M20x1.5 which appear identical
but are not interchangeable. The thread size is indicated on
the side of the positioner near the conduit connections.
Conduit fittings must match equipment housing threads
before installation. If threads do not match, obtain suitable
adapters or contact a Flowserve representative. See
Figure 20: Conduit and Grounding
.
NOTE:
Housings with M20x1.5 conduit threads are not
available with Certification Code 34. See Table 24.
20.2.5 Electromagnetic Compatibility
The Logix
®
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
®
positioner to restore operation.
20.3 Multi-Function Card (AO, DO, DI)
The Multi-Function Card can act as an Analog Output (AO),
a Discrete Output (DO), or a Discrete Input (DI).
Connections to the Multi-Function Card are made directly
to the card terminals. For detailed information about
voltage and current limits, see Table 12: Auxiliary Card
Status below.
See Section: 25 MULTI-FUNCTION CARD for more
information.
20.3.1 Analog Output
For AO function wire the MFC in series with a 10 to 40 VDC
power supply, including a method to determine the current.
When configured as an AO, the current will follow the valve
position. See Figure 21.
Figure 21: MFC Analog Output Circuit
10 VDC
to
40 VDC
Voltage
Source
MFC
Grounding
Terminals
Electrical
Conduit
Connections
Figure 20: Conduit and Grounding
