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Inactive timer
The Inactive timer module calculates the number of days the circuit breaker has
remained in the same open or closed state. The value is calculated by monitoring the
states of the
POSOPEN
and
POSCLOSE
auxiliary contacts.
The number of inactive days
INADAYS
is available as a service value. The initial
number of inactive days is set using the
InitInactDays
parameter.
Alarm limit check
MONALM
is initiated when the number of inactive days and hours exceed the limit
value defined by the
InactiveAlDays
and
InactivAlHrs
setting. The alarm signal
MONALM
can be blocked by activating the binary input
BLKALM
.
16.4.7.7
Circuit breaker spring charge monitoring
The circuit breaker spring charge monitoring subfunction calculates the spring
charging time. The operation is described in
.
SPRCHRD
BLOCK
BLKALM
Spring charging
time
measurement
Alarm limit
Check
SPRCHRST
RSTSPCHT
SPCHT
SPCHALM
IEC12000621 V2 EN
Figure 435:
Functional module diagram for circuit breaker spring charge
indication
Spring charging time measurement
The binary input
SPRCHRST
indicates the start of circuit breaker spring charging
time.
SPRCHRD
indicates that the circuit breaker spring is charged. The spring
charging time is calculated from the difference of these two signal timings. Spring
charging indication is described in Figure
.
The last measured spring charging time
SPCHT
is provided as a service value. The
spring charging time
SPCHT
can be reset on the LHMI or by activating the input
RSTSPCHT
.
Alarm limit check
If the time taken by the spring to charge is more than the value set with the
SpChAlmTime
setting, the subfunction generates the
SPCHALM
alarm.
It is possible to block the
SPCHALM
alarm signal by activating the
BLKALM
binary
input.
Section 16
1MRK502052-UEN B
Monitoring
908
Technical manual
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