KBR multimax 3D6
V3.00
EDEBD
A0210-3313-1_EN
30
This means:
The contact switches if the cumulated power is higher than 90 kW
(90% of the target value) and the message
E20 Prewarning contact active
is
issued.
There is no hysteresis, since the cumulated power increases with the end of the
measuring period.
The contact remains switched until the end of the measuring period.
It is discarded at the beginning of the next measuring period, since the
cumulated power starts below the alarm threshold again.
However, if the minimum on time is still running, the prewarning contact is not
deactivated.
If the contact is switched off, the message
E20 Prewarning contact active
disappears.
If a measuring period is restarted, the function of the prewarning contact
is locked for 10 minutes (measuring period time-out). That means that the
prewarning contact is not active / is deactivated (if the contact was active at the
end of the period before and there is no minimum on time).
The measuring period time-out is always started at the beginning of a
measuring period. The minimum on time and the minimum off time take
priority over the measuring period time-out.
Programming example:
Functional type: Trend power higher than power warning threshold
Prewarning contact active
TYPE
Ptrend > Pthreshold
Warning threshold
in % of the active
target value
90 percent
Hysteresis
in kW
10 kW
Minimum on time
in minutes
0.5 minutes
Minimum off time
in minutes
1.0 minutes
Period time-out
in minutes
10 minutes
Address prewarning contact
A 48
fixed
period target value active:
100kW
Warning threshold:
90% (corresponds to 90 kW)
Hysteresis:
10 kW
Minimum on time:
0.5 minutes (corresponds to 30 seconds)
Minimum off time:
1.0 minutes (corresponds to 60 seconds)
Period time-out:
10.0 minutes
