ABB RELION REX640 - Page 1549

SECRSYN
CBXCBR
I
Closing
command
Closing
request
Sy
nc OK
Figure 846: A simplified block diagram of SECRSYN in the command mode
operation
The SYNC_OK signal is delivered only once for each activated external closing
command signal. The pulse length of the delivered SYNC_OK is set with the Close
pulse setting.
t = Close pulse
Figure 847: Determination of the pulse length of the closing signal
In the command control mode operation, there are alarms for a failed closing
attempt ( CL_FAIL_AL) and for a command signal that remains active too long
( CMD_FAIL_AL).
If the conditions for closing are not fulfilled within the set time of
Maximum Syn
time , a failed closing attempt alarm is given. The CL_FAIL_AL alarm output signal
is pulse-shaped and the pulse length is 500 ms. If the external command signal is
removed too early, that is, before conditions are fulfilled and the closing pulse is
given, the alarm timer is reset.
1MRS759142 F
Control functions
REX640
Technical Manual
1549