29
Logix
®
520MD+ and 510+ Digital Positioners FCD LGENIM0105-15-AQ – 05/16
flowserve.com
Figure 27: Conduit and Grounding
7.2.5 Electromagnetic Compatibility
The Logix 500+ 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 500+ positioner to restore operation.
7.3 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-Func-
tion Card are made directly to the card terminals. For detailed infor-
mation about voltage and current limits, see Table 14: Auxiliary Card
Status below.
See section 13 MULTI-FUNCTION CARD for more information.
7.3.1 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 28.
Figure 28: MFC Analog Output Circuit
Conduit
Thread Size
Grounding
Terminals
Electrical
Conduit
Connections