ABB REL650 Applications Manual page 318

Section 11
Control
312
52a and CBREADY
These should be connected to binary inputs to pick-up information from the CB. The 52a
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 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 .
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. For single shot applications the input is set to FALSE.
THOLHOLD
Signal "Thermal overload protection holding back Auto-Reclosing". It is normally set to
FALSE. It can be connected to a thermal overload protection trip signal which resets only
when the thermal content has gone down 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 is halted.
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.
BLKON
Used to block the autorecloser for 3-phase operation (SMBRREC ,79) function for
example, when certain special service conditions arise. Input is normally set to FALSE.
When used, blocking must be reset with BLOCKOFF.
1MRK 506 334-UUS A
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