ABB RELION Series, Technical Manual

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t = Close pulse
GUID-0D9A1A7F-58D1-4081-B974-A3CE10DEC5AF V2 EN
Figure 319: 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.
Maximum Syn time
GUID-FA8ADA22-6A90-4637-AA1C-714B1D0DD2CF V2 EN
Figure 320: Determination of the checking time for closing
The control module receives information about the circuit breaker status and thus is
able to adjust the command signal to be delivered to the Synchro check function. If the
external command signal CL_COMMAND is kept active longer than necessary, the
CMD_FAIL_AL
alarm output is activated. The alarm indicates that the control
1MRS758755 A
Section 9
Control functions
REC615 and RER615 623
Technical Manual