9
pulse
cond13
CS13
BS13
CB13
t < t
Fig. 6. Determination of the maximum length of the closing signal.
The maximum length of the closing signal is
determined by the setting t
pulse
. If the external
command signal disappears during the closing
operation the closing signal delivered from the
stage also resets, however, in such a way that
the closing signal is at least 100 ms, approxi-
mately. If the external command signal is active
for a longer time than the setting value t
pulse
,
the closing signal resets after the set maximum
time has elapsed. (Note! Alarm CSF13 in fig-
ure 7).
Fig. 7. Determination of the alarm limit for a still active command signal.
The setting of the pulse length can also be used
for determining the alarm limit for a command
signal that has remained active. The alarm is
only important in systems according to figure
5, where the duration of the closing signal al-
ways is shorter than the set t
pulse
time. The con-
trol module receives information about the cir-
cuit breaker status and thus is able to adjust the
command signal to be delivered to the synchro-
check relay and at the same time the length of
the closing signal. If the external command sig-
nal CS13 still is active when the closing signal
resets after the set maximum t
pulse
time, the
alarm CSF13 is activated. The alarm indicates
that the control module has not removed the
external command signal after the closing op-
eration has been performed within the prede-
termined t
pulse
time. When the duration of a
standard external command signal constantly
exceeds the maximum length of the set closing
signal under normal closing conditions, the
alarm shall be disconnected to avoid unneces-
sary alarms. The alarm can be enabled or disa-
bled by means of the functional switchgroup
SGR.
t = t
cond13
CS13
BS13
CB13
CSF13
pulse