PCE Health and Fitness PCE-ND10, User Manual

Page: 26 / 50

28
Alarm operation hysteresis: alarm should be activated at
90
%
ordered power ( A1on ), and deactivated for e.g.: at 1 % lower
89
% (
A1of
).
Optimization of power limit function (delay at alarm activation):
alarm activation delay
t
o
=
10 %
∗
[
1 MW
∗
900 s
1,5 MW
]
=
60 s
( A1dt ).
A1on=90.% A1of=89.9%
Time of delay A1dt= 0 sec
1.5 MW
fig. 9 shows an example of how the consumed ordered active power parame-
ter can be used to alarm activation. Delay time is set at 0 seconds ( A1dt ).
In presented example for the remaining 10 % of ordered power at
maximum power consumption, all devices could operate for additional
60 seconds without imposing penalties. If the delay time A1dt had been
set to 60 seconds, alarm would not have been activated.
Fig. 9. Measurement of used ordered 15 minutes’ active
power consumption synchronized with the clock,
with alarm set on a 90% consumption.