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168
Synchro-check and energising-check
(SYRW)
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SYRW-VTSU
The synchrocheck function cooperates with the FFRW-VTSU con-
nected signal, which is the built-in optional fuse failure detection. It can
also be connected to external condition for fuse failure. This is a block-
ing condition for the energizing funcion.
SYRW-UB1FF
External fuse failure input from busbar voltage Bus 1 (U5). This signal
can come from a tripped fuse switch (MCB) on the secondary side of
the voltage transformer. In case of a fuse failure the energizing check is
blocked.
SYRW-UB1OK
No external voltage fuse failure (U5). Inverted signal.
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SYRW-AUTOOK
Synchrocheck/energizing OK. The output signal is high when the syn-
chrocheck conditions set on the HMI are fulfilled. It can also include the
energizing condition, if selected. The signal can be used to release the
auto-recloser before closing attempt of the circuit breaker. It can also be
used as a free signal.
SYRW-MANOK
Same as above but with alternative settings of the direction for energiz-
ing to be used during manual closing of the circuit breaker.
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