Basler BE1-CDS220, Instruction Manual

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BE1-CDS220 Reporting and Alarm Functions 6-7
Each time that the value in the current demand register is updated, it is compared to the values stored in
the Peak Since Reset and the Today's Peak registers. If the new demand value is greater, the new value
and time stamp is entered into the appropriate registers. In addition, the demand reporting function keeps
an additional set of registers for Yesterday's Peak. Each day at midnight, the demand reporting function
replaces the values and time stamps stored in Yesterday's Peak registers with the values and time
stamps from Today's Peak registers. It then starts recording new information in Today's Peak registers.
The demand registers are stored in volatile memory.
The Today's Peak and Yesterday's Peak registers are read only. The values in the Peak Since Reset
registers can be reset to zero or preset to a predetermined value. For example, if you are going to switch
some loads to take a feeder out of service and you do not want the abnormal loading to affect the values
stored in the Peak Since Reset registers. You may read these values prior to doing the switching and
then reset the registers to these values after the abnormal loading condition has passed.
Setting the Demand Reporting Function
For the demand reporting function to calculate demand, it is necessary to specify the demand interval,
calculation method, and which CT to monitor. This is done using BESTCOMS. Figure 6-3 illustrates the
BESTCOMS screen used to select demand-reporting settings. To open the screen shown in Figure 6-3,
select Reporting and Alarms, from the Screens pull-down menu. Then select the Demands tab.
Alternately, settings may be made using the SG-DI (Read/Program Demand Current settings) ASCII
command, or the HMI using Screen 6.4.1, \SETUP\DMD\DETAILS.
Demand settings for include columns labeled Phase, Neutral, and Neg.-Sequence. Each of these
columns has settings for Interval (Minutes), Calculation Method, Input, and Current Threshold. Current
Threshold display units are selectable from a pull-down menu allowing the selection of Sec. Amps, Pri.
Amps, Per U Amps, or % Amps. The default display unit is Sec. Amps. Calculation Method can be
Thermal, Block, or Sliding Block. Interval (Minutes) can be set from 0 to 60. Input can be set for CT Input
1 or CT Input 2.
Using the pull-down menus and buttons, make the application appropriate current demand settings.
Demand reporting settings are summarized in Table 6-4.
Figure 6-3. Reporting and Alarms Screen, Demands Tab