2 Using the MJ-5 Operator Panel and Controls
Siemens Industry, Inc. 4
2.1 Introduction to the Front Panel
The Front Panel (Figure 2.1) provides access to all
controller information. Configuration settings, set point
adjustments, and data requests are entered through a set of
large touch-keys. Front panel output devices include
indicator lights (LEDs) and a four-line sixteen-character
alphanumeric display screen.
The front panel is logically divided into three areas from
top to bottom:
The top third of the front panel contains various indicator
lights, a USB serial port for local data communication, and
a four-line sixteen-character display screen. Also included
in this area are touch-keys for the selection and
modification of set points and data. The keys below and to
the right of the display screen select specific readings or
settings; the keys to the right of the display screen can be
used to change the selected value. This section also
contains the Quick, Op Count, and Alert fast-path keys.
The middle third of the front panel includes a group of
special fast-path keys that provide direct access to
frequently-used functions (Regulation Setting, Line Drop
Compensation, Voltage Reduction Control, Voltage Limit
Control, Neutralite Test, and Drag Hands Reset).
In the bottom third, the MJ-5 Panel has mode and raise
lower switches, a power switch, binding posts for the
attachment of external power and metering equipment, and
controller fuses.
This chapter describes each of the front panel controls and
explains how you can use them to select, view, and change
stored data. For more detailed information about the
functions provided by these controls, read chapters 4 and 5.
2.2 Four-Line Sixteen-Character
Display Screen
The microprocessor presents information to the operator by
way of a four-line sixteen-character alphanumeric display
screen. This display screen presents both alphabetic and
numeric characters in plain text, eliminating the need for
special codes. The display screen uses an LCD with
backlight that is easy-to-read in direct sunlight as well as in
low light conditions.
2.3 Data Display
Front panel touch-keys provide easy access to all data
stored in MJ-5 Control Panel memory.
To view or change a given data item you must first display
it. Two types of touch-keys are provided to help you
display a data item:
Use the menu selection keys to view any stored data
item grouped by Menu Headings.
Use the fast-path keys to jump directly to frequently
used data items without scrolling.
2.3.1 Menu Selection and Change Keys
Use the Menu Selection and Change/Save keys, located in
the top third of the front panel, to view and change
controller set points and data items.
To view a specific data item, you must first select the menu
that contains that item. For example, meter readings are
selected from the <METER> menu; set points are selected
from the <REGULATOR> menu. Once the correct menu
is selected use the Scroll keys to step through the data items
in that menu until the desired data item is viewed on the
display screen. (For details about the menus, see Chapter 3
and Appendix G.)
Menu Key
Press this key once to return to the top of the current menu.
To return to the start of all menus from any position in any
Menu press this key twice.
Scroll Keys
These triangular keys surround the Menu key. Their shape
indicates the direction of scrolling performed by the key.
Use the right and left Scroll keys to scroll across menu
headings and move the cursor when in Change mode.
Use the up and down Scroll keys to scroll through data
items within a column and change settings when in
Change mode.
Change/Save Key
Use this key to place the panel in the Change mode. In
Change mode, you can make changes to set points and
other stored configuration information.
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