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CLINK II SCU MANAGER
functional description scu
version 5.0
41
Figure 16: Mains failure detection
5.7.2
Contactor failure detection
The starter logic records exactly in which state the contactors should be. Nevertheless the state of the
contactors may change as a result of:
•
A start1, start2 or stop command generated by the Remote Control Unit.
•
A mains failure.
As soon as the starter logic sees a change of state as a result of one of the above-mentioned points, a restart
request is made to the automatic restart procedure. To determine whether the contactor de-energized because
of a mains failure, the time is measured between:
•
The start of the mains failure (mains voltage failure message).
•
The moment the contactor de-energizes (restart request).
If this time is shorter than 200 ms it may be concluded that the contactor de-energized because of a mains
failure and the automatic restart procedure is started.
5.7.3
Restart time out
By means of the setpoint Immediate Restart Time-out and Delayed Restart Time-out (see table 30 on page
44), three time zones can be defined. See also figure 17:
90
65
0
Mains
Voltage
[%]
100
mains interruption time
MainsVoltageFailure
MainsVoltageHealthy
t