DECS-200 Human-Machine Interface 2-3
Editing Settings
Once the password is entered and security access is obtained, the first editable field of the current screen
is underlined. The setting in this field can be modified by pressing the Up pushbutton to increase the
setting or the Down pushbutton to decrease the setting. To edit another setting on the current screen, use
the Left pushbutton to advance the underline upward or the Right pushbutton to advance the underline
downward to the other editable fields.
After all desired editing on the current screen is complete, the changes can be saved or the values that
were in use prior to the edit session can be restored. Changes are saved by pressing the Edit pushbutton
which terminates the edit session and saves the changes in nonvolatile memory. Changes are aborted by
pressing the Reset pushbutton which terminates the edit session without saving the changes. The
previous values are then restored by reading them from nonvolatile memory. In both cases, the Edit
pushbutton LED turns off to indicate that the edit session is terminated.
Security (password) access is not immediately lost when an edit session is terminated. Security access
terminates after 10 minutes of pushbutton inactivity at the front panel. (Security access timeout is different
from edit session timeout;. see
Edit Session Timeout
.) If this period of inactivity occurs during an edit
session, any changes made are saved in nonvolatile memory and will be used or continue to be used by
the DECS-200. At this time, both edit access and security access are terminated.
In order to modify settings on another screen with the same access level, the user merely navigates to
that screen and presses the Edit pushbutton to start a new edit session on the new screen.
Edit Session Timeout
If the front panel is left in the Edit mode after any setting changes are made, the changes will be saved
and the edit session terminated after 10 minutes of pushbutton inactivity.
Changing Settings
All settings that are viewable at the front panel are password protected and require security access to
change.
Global access grants the right to change any viewable setting at the front panel.
Setpoint access grants the right to change only a few settings. These include basic operating settings like
Start/Stop, AVR/FCR, PF/var, control setpoints and pre-positions.
See Table 2-2 for a complete setting list that shows the range, increments and default values. In Table 2-
2, note that the Ref. column refers to numbers associated with the menu screens shown later in this
section. These numbers should help you find the specific screen that contains the setpoint or parameter
that you want to change. For a list of settings that are accessible with the Setpoint access level, see Table
2-3. All editable settings on a single menu screen are at the same access level.
NOTE
On most screen, setting changes are used immediately by the DECS-200.
However, these changes are not saved in nonvolatile memory until the Edit
pushbutton is pressed to terminate the edit session.
CAUTION
Pressing the Reset pushbutton after changing the active mode setpoint will
cause a step change in the operating setpoint that may have the potential to
adversely affect the system.
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