KW8M Eco-POWER METER
33
◆Working at power failure and at recovery
<At power failure>
・It stops the demand measurement.
・The present demand, demand log and monthly max. log data will be saved by the build-in battery.
<At recovery>
・When it recovers within the demand span, it will start measurement of present demand again with
the condition before power failure. The estimated demand and ratio of estimated demand are
calculated again at recovery and displayed.
・When it recovers at the next demand span, it will stop the measurement until next demand span
starts.
◆Working outline
<Present demand (PV)>
It shows demand value from the time when demand span starts to present time.
[Calculation]
Present
demand (kW)
=
Integral electric power
for 30 minutes.
×
<Estimated demand (EV)>
It shows the estimated demand value at the end of demand span according to the using power from the
time when demand span starts to present time.
[Calculation]
Estimated
demand(kW)
=
Present
demand
＋
Power change amount
for⊿t minutes (⊿P)
×
Remaining
time
(minute)
Sampling cycle ⊿t (minute)
<Demand setting value (SV)> It shows the threshold for demand alarm output and indication.
<Remaining time (the bottom line)> Demand span (30) － (minus) Elapse time (t)
<Ratio of estimated demand (SET.R)> Ratio of estimated demand to demand setting value
<Alarm output / indication>
When present demand or estimated demand is satisfied the setting conditions, it output alarm and it
indicates alarm.
⊿t
⊿P
←Estimated demand (kW)
←Present demand (kW)
←Demand setting value (kW)
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