61
Fixed block
Set power interval by 1 to 60 (min.) (every 1-min.) It calculates demand during latest finished interval
and displays. After one interval finishes, the next interval starts.
Calculate demand
during 0 to 15 min.
Calculate demand
during 15 to 30 min.
15-min. interval
15-min. interval
0
15
30
[min.]
5.4.3 30-min demand
It estimated an average using electric power and judges it for the setting demand every 1 min.
This works demand monitoring for electric power input by CT or pulse.
You can select demand calculation method, additional or average.
In order to use demand monitoring by pulse input, input pulse that meet the specifications of 8.5.
It output demand alarm according to the setting conditions.
◆
Output demand alarm
When present demand or estimated demand exceeds the setting threshold for power demand alarm,
it output alarm.
[present demand or estimated demand
≧
threshold for power demand alarm]
It keeps alarm output for 1 minute, after that,
[present demand or estimated demand
≧
threshold for power demand alarm] -> Keep alarm
[present demand or estimated demand
<
threshold for power demand alarm] -> Clear alarm
When you set hysteresis for power demand alarm, the timing of clear alarm is as below.
Ex.) Threshold for power demand alarm: 100kW Hysteresis: 10%
When present demand or estimated demand exceeds 100kW, it output alarm and keep 1
minute. After that if the present demand or estimated demand exceeds 90kW, it keep alarm.
If it is below 90kW, it clears alarm.
When you set hysteresis, it can avoid frequent alarm output ON/OFF near threshold for
power demand alarm.
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