ABB Relion 650 Series Technical Manual page 255

1MRK 511 424-UEN B
Bay control REC650 2.2 IEC
Technical manual
If the RESERVED output is not set, the selection is made with the output
RES_GRTx (where x=1-8 is the number of the requesting apparatus), which is
connected to switch controller SCSWI. If the bay already is reserved the command
sequence will be reset and the SCSWI will set the attribute "1-of-n-control" in the
"cause" signal.
Reservation of other bays
When the function QCRSV receives a request from an apparatus in the own bay
that requires other bays to be reserved as well, it checks if it already is reserved. If
not, it will send a request to the other bays that are predefined (to be reserved) and
wait for their response (acknowledge). The request of reserving other bays is done
by activating the output RES_BAYS.
When it receives acknowledge from the bays via the input RES_DATA, it sets the
output RES_GRTx (where x=1-8 is the number of the requesting apparatus). If not
acknowledgement from all bays is received within a certain time defined in SCSWI
(tResResponse), the SCSWI will reset the reservation and set the attribute "1-of-n-
control" in the "cause" signal.
Reservation request from another bay
When another bay requests for reservation, the input BAY_RES in corresponding
function block RESIN is activated. The signal for reservation request is grouped
into the output signal EXCH_OUT in RESIN, which is connected to input
RES_DATA in QCRSV. If the bay is not reserved, the bay will be reserved and the
acknowledgment from output ACK_T_B is sent back to the requested bay. If the
bay already is reserved the reservation is kept and no acknowledgment is sent.
Blocking and overriding of reservation
If QCRSV function is blocked (input BLOCK is set to true) the reservation is
blocked. That is, no reservation can be made from the own bay or any other bay.
This can be set, for example, via a binary input from an external device to prevent
operations from another operator place at the same time.
The reservation function can also be overridden in the own bay with the
OVERRIDE input signal, that is, reserving the own bay without waiting for the
external acknowledge.
Bay with more than eight apparatuses
If only one instance of QCRSV is used for a bay that is, use of up to eight
apparatuses, the input EXCH_IN must be set to zero.
If there are more than eight apparatuses in the bay, there has to be one additional
QCRSV. The two QCRSV functions have to communicate and this is done through
the input EXCH_IN and EXCH_OUT according to Figure 110. If more than one
QCRSV are used, the execution order is very important. The execution order must
be in the way that the first QCRSV has a lower number than the next one.
Section 8
Control
M13505-11 v2
M13505-15 v2
M13505-18 v4
M13505-22 v6
249