Spring charge time measurement
Two binary inputs, SPRCHRGN and SPRCHRGD, indicate spring charging started and
spring charged, respectively. The spring charging time is calculated from the difference of
these two signal timings.
The spring charging time SPRCHRT is available through the Monitored data view .
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.
12.18.7.8 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.
ALMPRES
LOPRES
PRESLO
PRESALM
BLOCK
BLK_ALM
0
0-tPressAlm
0
0-TPressLO
ANSI11000293-1-en.vsd
ANSI11000293 V1 EN
Figure 240: 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.
1MRK 511 287-UUS A Section 12
Monitoring
537
Technical manual
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