Flowserve StarPac II Control Valves - Manual (Page 25)

will open the valve at the selected rate. (Note that this value may be
set different from the spring failure of the actuator.)
Analog In 2 - This option sets up the second analog input in the
StarPac II system. This input can be used as an external input that
is used with the internal PID controller, or as an external sensor input
for the StarPac II to use in its internal operation. If you wish to use
the input as a controller input, you must select the NOT
CONNECTED option since the scaling for the PID input is done in
the T
UNE menu with the Process variable selection. If you want to
feed an external variable into the StarPac II, select the variable from
the list using the NEXT and PREVIOUS function keys on the menu.
Next, you will be asked for a full scale input value in your user-
defined units. (This is the process value that corresponds to the 100
percent signal.) The last step is to enter the offset or Zero input
value in your user-defined units. (This is the process value that
corresponds to the 0 percent signal). The available input variables
are:
Not Connected - Configures the StarPac II unit to ignore the
input as an internal variable, but the input may still be used as an
input to the controller that is configured with the process variable
selection in the T
UNE menu.
Process Temperature - Uses the value from the Auxiliary input
channel as the process temperature for all internal calculations
in place of the StarPac II sensor. The electronics assumes that
the Auxiliary input channel gets its signal from a temperature
transmitter.
Up Stream Pressure - Uses the signal from an external
pressure transmitter connected to the Auxiliary input channel as
the process pressure for all internal calculations in place of the
StarPac II sensor.
Down Stream Pressure - Uses an external pressure input as
the process pressure for all internal calculations in place of the
StarPac II sensor.
Valve Delta Pressure - Uses an external pressure input as the
process differential pressure for all internal calculations (in place
of the StarPac II differential pressure calculated by the difference
from the StarPac II internal pressure sensors). The most
common example is when a separate differential pressure
transmitter is used for cases when the application cannot
withstand pressure drops of at least ten percent of inlet
pressure.
Molecular Weight - Uses an external molecular weight input for
all internal calculations in place of the static value stored in the
StarPac II configuration.
Specific Gravity - Uses an external Specific Gravity input for all
internal calculations in place of the static value stored in the
StarPac II configuration.
Liquid Fudge Factor - This input allows you to make dynamic
adjustments to the liquid flow calculation based on the value of
the input.
Gas Fudge Factor - This input allows you to make dynamic
adjustments to the gaseous flow calculation based on the value
of the input.
StarPac II User Interface Manual 19