Flowserve StarPac II Control Valves - Manual (Page 16)

Man/Auto - This option selects or changes the operating mode if
the mode source has been set to digital. If the mode source is
set to Remote or Discrete, the mode can only be changed using
the discrete input or the remote register. In Manual mode the
unit operates as a normal control valve, positioning the valve
according to its current command signal.
In Auto mode the unit will operate as a controller using the PID
settings, process variable, and control action currently defined
using a bumpless transfer algorithm. (Note that if the unit is
using an analog command source, the system will bump
because the 4-20 signal will change from indicating position
command to process setpoint.)
Test mode takes the unit off-line and the system DOES NOT
calculate pressures, temperatures, flow, or PID values; nor does
it support setpoints or any analog or digital commands. Test
mode is the beginning mode after an initialization and is used
during calibration. If power is lost during a calibration setup, the
unit will remain in Test mode and the mode will have to be reset.
If the unit is in Test mode, the letter “T” will flash on the right side
of the display.
Mode Source - This selects where the StarPac II unit will
receive the mode information. “Digital” indicates that the
keypad or the StarTalk software can be used to change the
mode. “Discrete” indicates that an external signal applied to
terminals 33 and 34 will be used to switch the unit between
Auto and Manual modes. The definition is fixed with an
energized state indicating Auto mode. Remote mode is used
when a host system such as a PLC or DCS is used to set the
mode via digital communications.
The difference between Remote and Digital is that if the
Setpoint/command is not refreshed within a given period, the
StarPac II will assume that the unit has lost communication with
the host and will go to a trip condition.
Setpoint - Provides four options used to change the setpoint and
configure the source of the setpoint.
Setpoint % - Allows the direct input of the controller setpoint as
a percentage of maximum, as setup with the process variable,
provided the unit is in the Auto mode with the digital setpoint
selected.
Setpoint User Units - Allows the direct input of the setpoint in
the configured engineering units, provided the unit is in Auto
mode with the digital setpoint selected.
Analog/Digital - This option selects where the StarPac II system
will receive the setpoint information.
“Digital” indicates that the keypad or the StarTalk software can
be used to change the setpoint.
“Analog” prompts the StarPac II to use the 4-20 mA signal from
analog input No. 1 as the controller setpoint.
“Remote” is used when a host system such as a PLC or DCS is
used to write the setpoint to the unit digitally.
StarPac II User Interface Manual 10