ABB RELION REX640 Technical Manual page 1523

1MRS759142 C
REX640
Technical Manual
Sequence controller
When the LOCKED output is active, the AR function is in lockout. This means that new
sequences cannot be initialized, because AR is insensitive to initiation commands. It
can be released from the lockout state in the following ways.
• The function is reset through communication with the RecRs parameter. The
same functionality can also be found in the Clear menu (DARREC1 reset).
• The lockout is automatically reset after the reclaim time, if the Auto lockout reset
setting is in use.
If the Auto lockout reset setting is not in use, the lockout can be
released only with the RecRs parameter.
The AR function can go to lockout for many reasons.
• The INHIBIT_RECL input is active.
• All shots have been executed and a new initiation is made (final trip).
• The time set with the Auto wait time parameter expires and the automatic
sequence initiation is not allowed because of a synchronization failure.
• The time set with the Wait close time parameter expires, that is, the circuit breaker
does not close or the automatic sequence initiation is not allowed due to a closing
failure of the circuit breaker.
• A new shot is initiated during the discrimination time.
• The time set with the Max wait time parameter expires, that is, the master unit
does not release the slave unit.
• The frequent operation counter limit is reached and new sequence is initiated. The
lockout is released when the recovery timer elapses.
• The protection trip signal has been active longer than the time set with the Max
wait time parameter since the shot initiation.
• The circuit breaker is closed manually during an autoreclosing sequence and the
manual close mode is FALSE.
Protection coordination controller
The PROT_CRD output is used for controlling the protection functions. In several
applications, such as fuse-saving applications involving down-stream fuses, tripping
and initiation of shot 1 should be fast (instantaneous or short-time delayed). The
tripping and initiation of shots 2, 3 and definite tripping time should be delayed.
In this example, two overcurrent elements PHLPTOC and PHIPTOC are used.
PHIPTOC is given an instantaneous characteristic and PHLPTOC is given a time
delay.
The PROT_CRD output is activated, if the SHOT_PTR value is the same or higher than
the value defined with the Protection crd limit setting and all initialization signals
have been reset. The PROT_CRD output is reset under the following conditions:
Section 9
Control functions
1517