5. Operation
73
5.2 Usage According to Purpose (Alarm, Periodic Active Energy, Rolling Demand, Operating
Time, Password, etc.)
Display and calculation of rolling demand
The rolling demand is the value obtained by dividing the active energy/reactive energy/apparent energy (*1) in a specified
time (interval) by the length of the interval.
The block interval demand is to select the time width (interval) of the “block” used for the demand calculation.
(For setting of the rolling demand display, refer to page 44.)
This is displayed when the button is pressed repeatedly in the operation mode to switch the measurement
displays.
*1: The energy counting used the calculation of the rolling demand are as follows.
Item
Setting of IEC mode
Remarks
Normal mode
IEC mode
Rolling demand W (DW)
Active energy(import)
Active energy(import)
- Active energy(export)
Rolling demand var (Dvar)
{Reactive energy(Imported lag)
+ Reactive energy(Exported lead)}
{Reactive energy(Imported lag)
+ Reactive energy(Exported lead)}
-{Reactive energy(Exported lag)
+ Reactive energy(Imported lead)}
Refer to the
below picture.
Rolling demand VA (DVA)
Apparent energy
DISPLAY
①
Rolling block
The rolling block is to select the interval and sub-interval from 1- to 60-minute intervals (by minutes) and
calculate and update the rolling demand at the end of each subinterval.
＜
Example when the interval is 15 minutes and the subinterval is 5 minutes
＞
②
Fixing block
The fixing block is to select the interval from 1- to 60-minute intervals (by minutes) and calculate and update
the rolling demand at the end of each interval. (For the fixing block, the interval time and subinterval time
should be the same.)
＜
Example when the interval and subinterval are 15 minutes respectively
＞
<Calculation of rolling
demand>
The rolling demand is
calculated when the
“subinterval time”
completes.
<Display of rolling demand>
The displayed rolling demand is the
value of the latest interval time
completed.
15 minutes
5 minutes
0 5 10 15 20 25
Time (minutes)
<Calculation of
rolling demand>
The rolling demand
is calculated when
the “subinterval
time” completes.
<Display of rolling demand>
The displayed rolling demand is the
value of the latest interval time
completed.
15
minutes
15
minutes
0 15 30
Time (minutes)
Note. Immediately after the adjusting rolling demand time is set, the demand time timer starts at "0 minute."
Note. Immediately after the adjusting rolling demand time is set, the demand time timer starts at "0 minute."
＋
W
－
W
＋
var
－
var
Exported lag
Imported lead
Exported lead
Imported lag
