Siemens MJ-XL Installation And Operation Manual page 26

4
Setting Up the MJ-XL Control Panel
To use the Sliding Window method, view Dmd Type and
specify WINDOW. Then view DmdTime and specify the
length of the period in minutes (1 to 999); view DmdSub-
periods and specify the number of subperiods as a num-
ber between 1 and 99.
Thermal Method
The Thermal method is typical of the characteristic time
lag of mechanical or thermal devices as they absorb elec-
trical energy. It is based on the Code for Electricity Meters,
ANSI C12-1975, which defines the interval of a thermal
demand meter as the time required for the meter to indi-
cate 90% of a change in the load. Demand values are
updated once each second.
For example, if you specify DmdTime = 15, the demand
meter indicates 90% of a steady load fifteen minutes after
the load is applied. In the next fifteen minutes, it responds
to 90% of the remainder of the total load. As a result, the
load is constantly averaged and transient variations are not
reflected.
Note: The Demand Subperiod data item is ignored by
the Thermal method.
4.3.19 Min/Max Reset
The Min/Max Reset data item resets Meter and Demand
max/min values in the microprocessor to current instanta-
neous values. This function is useful when setting up the
microprocessor for the first time, or when you want to
reset electronically-maintained values.
Note: Do not use this function unless you want to
reset all Meter and Demand min/max values; to
reset selected values, use the Cancel/Reset
key described in Chapter 2.
To request that Meter and Demand Max/Min values be
reset, view Reset Max/Min; use the Change key and the
Scroll keys to change the default N(o) to Y(es). Then press
the Save key to complete the change process.
4.3.20 Min/Max t.o. (Min/Max Time Out)
The Min/Max t.o. data item defines the length of time that
the Min/Max data items will be presented at the display
screen. At the end of this period, the display returns to the
present value.
To specify the Min/Max timeout period, view Min/Max
t.o.; use the Change key and the Scroll keys to define the
number of seconds in the time-out period. Then press the
Save key to complete the change process.
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4.3.21 Screen t.o. (Screen Time Out)
The Screen t.o. data item defines the length of time that
any data item is displayed. At the end of the timeout
period, the display returns to the <METER> Menu.
4.3.22 Basis volts (Basis Volts)
The Basis Volts data item defines whether the MJ-X
trol program is to convert the regulator transformer sec-
ondary voltage to 115, 120, or 125 volts. See Figures 4.1 to
4.3 for examples.
4.3.23 Vers. (Version)
Main Processor software version NN.NNNN. This data
item displays the installed version of the microprocessor
control program.
4.3.24 Memo 1 and Memo 2
These two data items allow you to record installation-spe-
cific information that can be viewed at a later time. For
example, you might wish to use one Memo to document
the regulator' s serial number, and the other Memo to doc-
ument its location. This information could then be viewed
by a remote operator via a communications link.
To enter data into these data items, view the <CONFIG-
URE> Menu; then use the Scroll keys to view Memo 1 or
Memo 2. The display screen responds by flashing the
"blank" character (n) in the leftmost position of the ten-
character Memo field. This indicates the character to be
changed. Use the Ù and Ú keys to step through the alpha
and numeric characters until the desired character is pre-
sented on the display screen. Then press the Ø key to
move the cursor to the next character to the right, and so
on until all ten characters of the Memo have been entered.
When you have completed entering the Memo, press the
Save key to complete the change.
Valid characters are A-Z; 0-9; space; comma; semi-colon;
period; dash; slash; ampersand (&), and the # character.
Default is all spaces.
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