a
b
c
en05000251.vsd
IEC05000251 V1 EN
Figure 27:
Binary minute pulses
The default time-out-time for a minute pulse is two minutes, and if no valid minute
pulse is received within two minutes a SYNCERR will be given.
If contact bounce occurs, only the first pulse will be detected as a minute pulse. The
next minute pulse will be registered first 60 s - 50 ms after the last contact bounce.
If the minute pulses are perfect, for example, it is exactly 60 seconds between the
pulses, contact bounces might occur 49 ms after the actual minute pulse without
effecting the system. If contact bounce occurs more than 50 ms, for example, it is less
than 59950 ms between the two most adjacent positive (or negative) flanks, the minute
pulse will not be accepted.
Binary synchronization example
An IED is configured to use only binary input, and a valid binary input is applied to a
binary input card. The HMI is used to tell the IED the approximate time and the minute
pulse is used to synchronize the IED thereafter. The definition of a minute pulse is that
it occurs one minute after the previous minute pulse, so the first minute pulse is not
used at all. The second minute pulse will probably be rejected due to the spike filter.
The third pulse will give the IED a good time and will reset the time so that the fourth
minute pulse will occur on a minute border. After the first three minutes, the time in
the IED will be good if the coarse time is set properly via the HMI or the RTC backup
still keeps the time since last up-time. If the minute pulse is removed for instance for
an hour, the internal time will drift by maximum the error rate in the internal clock. If
the minute pulse is returned, the first pulse automatically is rejected. The second pulse
will possibly be rejected due to the spike filter. The third pulse will either synchronize
the time, if the time offset is more than 100 ms, or adjust the time, if the time offset is
small enough. If the time is set, the application will be brought to a safe state before the
time is set. If the time is adjusted, the time will reach its destination within 1.7 minutes.
Section 4
1MRK505222-UUS C
Basic IED functions
90
Technical reference manual
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