ABB REB670 Applications Manual page 321

1MRK 505 337-UUS -
Application manual
SYNC
This is connected to the internal synchronism check function when required. It can also be
connected to a binary input for synchronization from an external device. If neither internal
nor external synchronism or energizing check is required, it can be connected to a
permanently high source, TRUE. The signal is required for three phase shots 1-5 to
proceed (Note! Not the HS step).
PLCLOST
This is intended for line protection permissive signal channel lost (fail) for example, PLC=
Power Line Carrier fail. It can be connected, when required to prolong the AutoReclosing
time when communication is not working, that is, one line end might trip with a zone 2
delay. If this is used the autorecloser must also be started from Zone2 time delayed trip.
TRSOTF
This is the signal "Trip by Switch Onto Fault". It is usually connected to the "switch onto
fault" output of line protection if multi-shot Auto-Reclose attempts are used. The input
will start the shots 2-5.
THOLHOLD
Signal "Thermal overload protection holding back Auto-Reclosing". It can be connected
to a thermal overload protection trip signal which resets only when the thermal content has
fallen to an acceptable level, for example, 70%. As long as the signal is high, indicating
that the line is hot, the Auto-Reclosing is held back. When the signal resets, a reclosing
cycle will continue. Please observe that this have a considerable delay. Input can also be
used for other purposes if for some reason the Auto-Reclose shot need to be halted.
TR2P and TR3P
Signals for two-pole and three-pole trip. They are usually connected to the corresponding
output of the TRIP block. They control the choice of dead time and the reclosing cycle
according to the selected program. Signal TR2P needs to be connected only if the trip has
been selected to give 1/2/3 pole trip and an auto reclosing cycle with two phase reclosing
is foreseen.
WAIT
Used to hold back reclosing of the "low priority unit" during sequential reclosing. See
"Recommendation for multi-breaker arrangement" below. The signal is activated from
output WFMASTER on the second breaker Auto-Recloser in multi-breaker
arrangements.
Section 12
Control
315