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Rev 1 MX28B-1200+27V PRODUCT MANUAL
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6 SETUP, ADJUSTMENTS, AND OPERATION
6.1 User Interface
The MX28B control unit provides a user interface designed with a hierarchical menu that can be
viewed on the 32-character display by “navigating” with the “ï” (left), “ð” (right), “ñ” (up), and
“ò” (down) arrow keys located on the front panel. The selected item on the display is identified by
the cursor cycling beneath its characters.
MX28B1200 24V +
STATUS ALARMS SYSTEM MODULES BATT PIN OEM
Figure 6-1 Navigating the Menu
The “M” (Modify) key and the arrow keys are used to set parameters and text to customize the system
operation for a specific application. Items that can be modified have "m+" in the upper right corner
of the display. If a security level higher than the one presently set is required to modify the
parameter, "s+" is displayed instead of “m+”. Status, alarms, and information screens have "+" in the
upper right corner of the display (or “#” in the case of rectifier information screens) and cannot be
modified. When AC power is initially applied, there is a 60-second period during which no alarms
are reported.
Pressing the "M" key on the front panel will change the "m+" to "M+", indicating that the parameter
can now be changed using the arrow keys. Some parameters can be changed to other predefined
selections by pressing the up or down arrow keys to display an alternative selection. These
parameters can be recognized after the “M” key is pressed by the cursor cycling beneath the
characters of the selection. For other parameters, such as text and most numeric values, after the “M”
key is pressed the cursor will be displayed under an individual character. The right or left arrow key
is used to position the cursor below the character to be changed and the up or down arrow key is used
to "spin" the digit or letter to the desired value. When the desired changes have been made to an
individual parameter screen, the “M” key is pressed again; the “M+” changes back to “m+” and the
new entry is stored in memory.
If the user plans to make any changes to system parameters, the first item that should be verified or
entered is the appropriate password for the security level required for the parameters to be modified.
Security level 2 enables modification of all variable system parameters; level 1 permits modification
of some parameters; no security is required for viewing status items. The security level password is
entered through the “PIN” screen. If no front panel keys are pressed for 60 minutes, the active
password reverts to “0000” and “¦APC¦” begins to move about the display. Pressing any key
returns the display to normal; the password must be re-entered if system parameters require changes.