Nexen Smart Valve 964508 - Manual (Page 10)

7
FORM NO. L-20353-C-0302
OPERATION
Digital Pressure Selection
NOTE: Make the proper setting in SETUP and the correct connections in ELECTRICAL CONNECTIONS before you
apply power to the SmartValve.
During the Digital Pressure Selection mode of operation, the SmartValve will provide sixteen different pressures that
correspond to the decoded value of the four pressure select inputs (refer to Table 1 in SETUP). Select a pressure by
applying 12-24VDC to the appropriate pressure selct inputs and observe the pressure output with a pressure gauge.
The output pressure should match closely with the pressure given in Table 1 that corresponds to the input selections
made and setting of the mode switch.
Apply a voltage signal to the SmartValve’s exhaust pressure input and the
output pressure will go to zero. At this time, the Alarm Output will change from on-to-off or off-to-on depending on W3.
This condition can only be reset by choosing another pressure via the pressure select inputs.
Analog Pressure Selection
NOTE: Make the proper setting in SETUP and the correct connections in ELECTRICAL CONNECTIONS before you
apply power to the SmartValve.
During the Analog Pressure Selection mode of operation, the SmartValve converts a 0-10VDC signal into a 0-80 psig
output. Observe the pressure output with a pressure gauge. As the voltage increases, the pressure will increase
linearly with it. Apply a voltage signal to the SmartValve’s exhaust pressure input and the output pressure will go to
zero. At this time, the Alarm Output will change from on-to-off or off-to-on depending on W3. This condition can only
be reset by applying zero volts to the analog input. After that, the output pressure will track the input voltage again.
See Figure 5.
Maintain Pressure Function
NOTE: Make the proper setting in
SETUP and the correct connections in ELECTRICAL CONNECTIONS before you
apply power to the SmartValve.
During the Maintain Pressure Selection mode of operation, the SmartValve measures the internal air pressure of the
valve manifold and maintains that pressure. At start-up, the SmartValve responds to the default pressure select inputs
(Table 1) as if it were set in Mode 1 of the Digital Pressure Selection mode of operation, until you apply a 12-24VDC
signal to the signal input wire (refer to Figure 3). When you apply a 12-24VDC signal, the SmartValve measures the air
pressure of the manifold's interior and uses that pressure reading as a set point. This pressure will be maintained until
the 12-24VDC signal is removed from the signal input wire. When the 12-24VDC is removed, the SmartValve shuts off
its internal solenoid valves and no longer maintains the air pressure. The air pressure will remail constant providing there
are no air leaks in the manifold, the external tubing or any of the devices connected to
it.