Figure 848: Determination of the checking time for closing
CBXCBR 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.
Close pulse
Maximum Syn time
5s
Figure 849: Determination of the alarm limit for a still-active command signal
Closing is permitted during
Maximum Syn time
, starting from the moment the
external command signal CL_COMMAND is activated. The CL_COMMAND input must
be kept active for the whole time that the closing conditions are waited to be
fulfilled. Otherwise, the procedure is cancelled. If the closing-command conditions
are fulfilled during
Maximum Syn time
, a SYNC_OK pulse is delivered to the circuit
breaker function. If the closing conditions are not fulfilled during the checking time,
the alarm CL_FAIL_AL is activated as an indication of a failed closing attempt.
The SYNC_OK pulse is not delivered if the closing conditions become valid after
Maximum Syn time
has elapsed. The closing pulse is delivered only once for
Control functions
1MRS759142 F
1550 REX640
Technical Manual
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