ABB RET650 Technical Manual page 275

1MRK 504 135-UEN A
Technical manual
Interaction with synchrocheck and synchronizing functions
The Switch controller (SCSWI) works in conjunction with the synchrocheck and the
synchronizing function (SESRSYN). It is assumed that the synchrocheck function is
continuously in operation and gives the result to SCSWI. The result from the
synchrocheck function is evaluated during the close execution. If the operator
performs an override of the synchrocheck, the evaluation of the synchrocheck state is
omitted. When there is a positive confirmation from the synchrocheck function,
SCSWI will send the close signal EXE_CL to the switch function Circuit breaker
(SXCBR).
When there is no positive confirmation from the synchrocheck function, SCSWI will
send a start signal START_SY to the synchronizing function, which will send the
closing command to SXCBR when the synchronizing conditions are fulfilled, see
figure 122. If no synchronizing function is included, the timer for supervision of the
"synchronizing in progress signal" is set to 0, which means no start of the
synchronizing function. SCSWI will then set the attribute "blocked-by-
synchrocheck" in the "cause" signal. See also the time diagram in figure 125.
SCSWI
SYNC_OK
START_SY
SY_INPRO
SESRSYN
Synchro
check
IEC09000209 V1 EN
Figure 122: Example of interaction between SCSWI, SESRSYN (synchrocheck
and synchronizing function) and SXCBR function
Time diagrams
The Switch controller (SCSWI) function has timers for evaluating different time
supervision conditions. These timers are explained here.
The timer tSelect is used for supervising the time between the select and the execute
command signal, that is, the time the operator has to perform the command execution
after the selection of the object to operate.
EXE_CL
CLOSE
OR
CLOSECB
Synchronizing
function
IEC09000209_1_en.vsd
Section 12
Control
SXCBR
269