3 Viewing and Changing MJ-4A & MJ-4B Data Items
Siemens Energy, Inc. 15
3 Viewing and Changing MJ-4A & MJ-4B Data Items
The MJ-4
Control Panel stores a considerable amount of
data. Some of the data items are setpoints used to control
the tap changer; others are meter readings and logged his-
torical data that can be used to monitor system activity. All
of the major data items can be displayed on the 16-charac-
ter screen. The setpoints and other configuration items
can be displayed and changed from the front panel.
This chapter describes how data items are organized, how
to view a specific data item, and, if applicable, how to
change it.
3.1 Viewing Data Items
The MJ-4
Control Panel provides two techniques for view-
ing data items:
1. Use Menu Selection keys and Scroll keys to view any
data item.
2. Use Fast-path keys to view certain frequently-used
data items.
3.2 Understanding Menus
MJ-4
Control Panel information is organized into lists
(Menus) of related data. Each specific piece of information
in MJ-4
memory is known as a data item. To view or
change a specific data item, you must select the Menu
that contains the desired item. Appendix G provides a
Menu Structure Quick Reference for help in locating a spe-
cific data item.
For example, the <LOG SETUP> Menu contains data
items that you can use to define logging requirements. To
define logging requirements, view the <LOG SETUP>
Menu; then display the particular data item from that
Menu. As another example, the <METER> Menu con-
tains meter-reading data. To determine the present load
voltage meter reading, view the <METER> Menu and
then the Load Voltage data item from that Menu. The
<METER> Menu is considered the home position in the
MJ-4
Control Panel's menu structure.
MJ-4
Control Panel Menus are divided into two major cat-
egories:
1. Setup Menus define the environment. In general,
these Menus are only used at installation. Examples
include:
• the <CONFIGURE> Menu, which defines the
regulator and its application.
• the <REGULATOR> Menu, which defines set-
points.
• the <LOG SETUP> Menu, which defines logging
preferences, etc.
2. Operational Menus contain daily operational informa-
tion that can help you monitor system performance.
Examples include:
• the <METER> Menu, which provides rms meter
readings.
• the <DEMAND> Menus, which provide Demand
data.
• the <LOG> Menu, which contains historical data.
3.3 Using the Menu Selection Keys to
View Data Items
This section describes how the Menu Selection and Scroll
keys can be used to view data items.
Think of the Menu arrangement as a table of data items
on a sheet of paper as illustrated in Table 3.1.
Each column of the table has a heading (Menu name).
Since you are viewing this “table” through a 16-character
window, you must scroll through the table to view the
desired data item. The following scrolling rules apply:
• At the heading level, scroll through the Menu head-
ings with the left and right Scrolling keys.
• Within a selected menu, use the up and down Scroll-
ing keys to step through the various data items.
Table 3.1 Structure of MJ-4
Menus
... <FW DEMAND><REV DEMAND><COUNTERS> ...
data item 1 data item 1 data item 1 data item 1 data item 1
data item 2 data item 2 data item 2 data item 2 data item 2
data item 3 data item 3 data item 3 data item 3 data item 3
.....
.....
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