SIREC D Display Recorder 7ND4000

4. Selecting Alarm Type - After the Alarm Number
is selected, the display will show the various
Alarm Types, note only the following are valid -
• Type=none
• Type=abnorm
• Type=open
• Type=close
All other Alarm Types are not used for Dry Contact
Point Types. Use the UP (↑) or DOWN (↓) Arrow
Keys to scroll through the Alarm Types in the
Alarms Setup Menu and press ENTER when the
desired Alarm Type is displayed.
The Display will return to “Alarm Limits” if
“Type=none” is selected, otherwise the display will
read “contact #? X” for other Alarm Types. This is
used to assign the alarm to a physical output provided
the Relay Output option is fitted.
5. Setting Alarm Contact Number - Use the UP
(↑) or DOWN (↓) Arrow Keys to scroll the Alarm
Contact Number, 1 - 6 and press ENTER then
EXIT. The display will return to “Alm limits” in the
Alarms Options Menu.
6. Selecting Alarm Delay - Use the UP (↑) or
DOWN (↓) Arrow Keys to highlight “Alm delay”
and press ENTER. The display will read “seconds�XXX�“.
7. Setting Alarm Delay - Use the numeric keypad
to the Alarm Delay in seconds (maximum of 600
seconds). When the desired number of seconds is
displayed, press ENTER and the display returns
to the “Alm delay” menu item in the Alarms Options
Menu. Exit to the main menu and keep the
setup if desired.
Siemens AG C79000-G7374-C211-01
SIREC D Manual
Programming
4.6.7 Industrial Square Root
Current/ Voltage Point Types. The
Recorder accepts three voltage square root
extraction ranges: +100mV sqrt, +1 Volt sqrt, and
+10 Volt sqrt and two types of linear current square
root extraction ranges: 4 to 20mA sqrt and 10 to
50mA sqrt.
This function is used for inputs which require the
Industrial Square Root of the input signal (i.e. flow
measurement). The system calculates the square
root of the percentage of input scale and multiplies
this value by the high end scale to produce the
value of the point displayed.
A. Example - the input is 4 to 20mA and the
scaling is such that 0 = Low End of Scale and 1000
= High End of Scale.
High End Scale = 1000 gallons per minute
Input Signal = 12mA or 50% of scale which is
equal to 0.5
Square Root of 0.5 = 0. 707
Actual value displayed is 0.707 x 1000 = 707
GPM (with decimal fix of 0)
This input requires that the internal shunt resistor be
switched in on the rear panel or that you provide an
external resistor.
B. Programming Parameters - Selecting
Industrial Square Root point types requires setting
up parameters like regular Programming linear point
types. From the Point Type menu (Figure 4-12) use
the UP (↑) or DOWN (↓) Arrow Keys to highlight
“Ind sqrt” and press ENTER. The Point Setup menu
for Industrial Square Root will be displayed and may
require programming of the following parameters.
• Point tag (up to 10 characters)
• Input Scale (Voltage Square Root Only)
• Output Scale (Lo scale is fixed at zero for
current ranges)
• Currents
• Filter (seconds 0 - 30)
• Engineering Units (Up to five characters)
• Alarm Setpoints (Limits, Deadband, and
Delay)
• Chart Scale
Each of these parameters is identical to that for
Linear inputs described above and the programming
method is the same. Refer to Paragraph 4.6.5
above for description and programming information.
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