Efficient Plant November 2017 - 25

feature | controlling flow

for local control, an Ethernet wire is all that is needed to
ensure communication throughout the facility.
Information from Festo points to four valve assemblies
and the combinations of inputs and outputs that can be used
for pneumatically actuated control (Fig. 3 on p. 26):
 Configuration 1 uses a Namur valve connected to the compressed-air line, which will direct the air to either the "open"
port or "close" port of the actuator. This setup requires an
electrical signal to be wired to the Namur valve, a sensor box, and a pneumatic
connection to the compressed-air line. The sensor box detects which position the
valve is in and sends the feedback to the controller. The inventory for Configuration 1 includes two electrical wires and one pneumatic line. This configuration
is best suited for a local control panel, especially if multiple valves will have a
similar configuration. This one input and one output setup does not require a
valve terminal to be installed in the control cabinet.
 Configuration 2 uses a valve terminal in a cabinet and two pneumatic lines
Fig. 2. With many automated-valve configurations, a short run of wires to the control cabinet (as shown in this schematic) can save costly installation and difficult, time-consuming
troubleshooting if an open circuit becomes an issue.

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EFFICIENTPLANTMAG.COM |

25


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Table of Contents for the Digital Edition of Efficient Plant November 2017

Efficient Plant November 2017 - 1
Efficient Plant November 2017 - Cover1
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