ABB REC670 Applications Manual page 343

1MRK 511 401-UUS A
Bay control REC670 2.2 ANSI
Application manual
BLKOFF
Used to unblock the auto recloser when it has been blocked due to activating BLKON
input or by an unsuccessful auto reclosing attempt if the BlockByUnsucCl setting is set
to On.
BLKON
Used to block the auto recloser, for example, when certain special service conditions
arise. When used, blocking must be reset with BLKOFF.
CBCLOSED and CBREADY
These binary inputs should pick-up information from the circuit breaker. At three
operating gears in the circuit breaker (single pole operated circuit 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). The CBREADY is a signal
meaning that the circuit breaker is ready for an auto reclosing operation, either Close-
Open (CO), or Open-Close-Open (OCO). If the available signal is of type "circuit
breaker not charged" or "not ready", an inverter can be inserted in front of the
CBREADY input.
INHIBIT
To this input shall be connected signals that interrupt an auto 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 circuit breaker open
position is set to start the auto recloser, then manual opening must also be connected
here. The inhibit is often a combination of signals from external IEDs via the I/O and
internal functions. An OR-gate is then used for the combination.
MODEINT
The auto reclosing mode is selected with the ARMode setting. As an alternative to the
setting, the mode can be selected by connecting an integer, for example from function
block B16I, to the MODEINT input. The six possible modes are described in table 6
with their corresponding MODEINT integer value. When a valid integer is connected
to the input MODEINT the selected ARMode setting will be invalid and the MODEINT
input value will be used instead. The selected mode is reported as an integer on the
MODE output.
ON and OFF
These inputs can be connected to binary inputs or to a communication interface block
for external control.
Section 14
Control
337