Alarm limit check
If the time taken by the spring to charge is more than the value set with the
tSprngChrgAlm
setting, the subfunction generates the
SPRCHRAL
alarm.
It is possible to block the
SPRCHRAL
alarm signal by activating the
BLOCK
binary
input.
12.17.7.8
Gas pressure supervision
The gas pressure supervision subfunction monitors the gas pressure inside the arc
chamber.
The operation of the subfunction can be described by using a module diagram. All the
modules in the diagram are explained in the next sections.
GUID-A913D2D7-398B-41F6-9B21-BBCECD3F596D V1 EN
Figure 180:
Functional module diagram for circuit breaker gas pressure alarm
The gas pressure is monitored through the binary input signals
LOPRES
and
ALMPRES
.
Pressure alarm time delay
When the
ALMPRES
binary input is activated, the
PRESALM
alarm is activated after
a time delay set with the
tPressAlm
setting. The
PRESALM
alarm can be blocked by
activating the
BLOCK
input.
If the pressure drops further to a very low level, the
LOPRES
binary input becomes
high, activating the lockout alarm
PRESLO
after a time delay set with the
TPressLO
setting. The
PRESLO
alarm can be blocked by activating the
BLOCK
input.
The binary input
BLOCK
can be used to block the function. The activation of the
BLOCK
input deactivates all outputs and resets internal timers. The alarm signals from
the function can be blocked by activating the binary input
BLK_ALM
.
Section 12
1MRK 505 288-UEN A
Monitoring
412
Technical manual
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