ABB SYN 5201 Operating Instructions Manual page 20

Operating Instructions
SYN 5201 and SYN 5202 can be operated purely as a synchrocheck in that the
command generation, the voltage and frequency matcher are switched off in the
parameter set.
If the same circuit breaker is to be switched, once automatically and once manually
using synchrocheck in alternation, and in both cases the same synchronizer is to be
used, this can be achieved through configuration of the inputs and outputs.
2.5 Self-monitoring of the synchronizer
Extensive monitoring includes the following functions:
2.5.1 Hardware monitoring
Auxiliary voltage : The internally stabilised (reference) voltages are monitored. In the
event of inadmissible deviations, the device is immediately blocked with a corresponding
error message being displayed. Failure of the auxiliary voltage is signalled via a
normally closed contact (ERROR).
Paralleling command circuit : Contact monitoring is provided by means of forcibly
guided contacts on all command relays. If the contacts fail to open again after a
command has been given, the contact monitoring prevents the synchronization from
being selected again. This signal can be made available externally through
corresponding configuration of the digital outputs, so that the connection of the
command circuit can be blocked. This function is also used to monitor the internal
circuits for short circuits.
The internal fault and event logger records when each individual relay has opened and
closed.
2.5.2 Software monitoring
The design of the SYN 5202 guarantees a degree of security against incorrect
paralleling which satisfies the most demanding requirements, because the different
processor types in the individual channels are equipped with different software and
completely separate measuring units and command relays.
The program sequence is interrupted and reset by the internal watchdog, if an error
occurs. After reset, it is again started automatically. This starting procedure is carried out
three times, afterwards the device is totally blocked with the corresponding error
message.
2.5.3 Monitoring of external events
After expiry of the set total paralleling time tot t, the monitoring of external events
indicates failure by the control system or measuring signals to fulfil conditions, as well as
implausible configuration. If necessary, t tot can be set to zero. This deactivates this
monitoring function.
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ABB Switzerland Ltd
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SYN 5201/SYN 5202
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