The closing signal is delivered only once for each activated external closing
command signal. The pulse length of the delivered closing is set with the
Close
pulse
setting.
Figure 528: Determination of the pulse length of the closing signal
In the command control mode operation, there are alarms for a failed closing
attempt ( CL_FAIL_AL) and for a command signal that remains active too long
( CMD_FAIL_AL).
If the conditions for closing are not fulfilled within the set time of
Maximum Syn
time
, a failed closing attempt alarm is given. The CL_FAIL_AL alarm output signal
is pulse-shaped and the pulse length is 500 ms. If the external command signal is
removed too early, that is, before conditions are fulfilled and the closing pulse is
given, the alarm timer is reset.
Figure 529: Determination of the checking time for closing
The control module receives information about the circuit breaker status and thus
is able to adjust the command signal to be delivered to the Synchro check function.
If the external command signal CL_COMMAND is kept active longer than necessary,
the CMD_FAIL_AL alarm output is activated. The alarm indicates that the control
module has not removed the external command signal after the closing operation.
To avoid unnecessary alarms, the duration of the command signal should be set in
such a way that the maximum length of the signal is always below
Maximum Syn
time
+ 5s.
Control functions
1MRS757644 H
1004 620 series
Technical Manual
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