ABB REQ650 - Page 211

Recommendations for input signals
Please see examples in figure 89.
ON and OFF
These inputs can be connected to binary inputs or to a communication interface block
for external control.
START
It should be connected to the trip output protection function, which starts the
autorecloser for 3-phase operation (SMBRREC) function. It can also be connected to
a binary input for start from an external contact. A logical OR-gate can be used to
combine the number of start sources.
If StartByCBOpen is used, the CB Open condition shall also be
connected to the input START.
INHIBIT
To this input shall be connected signals that interrupt a reclosing cycle or prevent a
start from being accepted. Such signals can come from protection for a line connected
shunt reactor, from transfer trip receive, from back-up protection functions, busbar
protection trip or from breaker failure protection. When the CB open position is set to
start SMBRREC, then manual opening must also be connected here. The inhibit is
often a combination of signals from external IEDs via the IO and internal functions.
An OR gate is then used for the combination.
CBPOS and CBREADY
These should be connected to binary inputs to pick-up information from the CB. The
CBPOS input is interpreted as CB Closed, if parameter CBAuxContType is set
NormOpen, which is the default setting. At three operating gears in the breaker (single
pole operated breakers) the connection should be “All poles closed” (series
connection of the NO contacts) or “At least one pole open” (parallel connection of NC
contacts) if the CBAuxContType is set to NormClosed. The “CB Ready” is a signal
meaning that the CB is ready for a reclosing operation, either Close-Open (CO), or
Open-Close-Open (OCO). If the available signal is of type “CB not charged” or “not
ready”, an inverter can be inserted in front of the CBREADY input.
SYNC
This is connected to the internal synchrocheck 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 .
1MRK 505 291-UEN A Section 10
Control
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Application manual