Change Lock Function Chnglck - ABB Relion Technical Manual

Section 17
Basic IED functions
17.5
17.5.1
17.5.2
682
When a binary input is used to set the IED in test mode and a parameter,
that requires restart of the application, is changed, the IED will re-enter
test mode and all functions will be blocked, also functions that were
unblocked before the change. During the re-entering to test mode, all
functions will be temporarily unblocked for a short time, which might lead
to unwanted operations. This is only valid if the IED is set in TEST mode
by a binary input, not by local HMI.
The TESTMODE function block might be used to automatically block functions when a
test handle is inserted in a test switch. A contact in the test switch (RTXP24 contact 29-30)
or an FT switch finger can supply a binary input which in turn is configured to the
TESTMODE function block.
Each of the functions includes the blocking from the TESTMODE function block.
The functions can also be blocked from sending events over IEC 61850 station bus to
prevent filling station and SCADA databases with test events, for example during a
commissioning or maintenance test.

Change lock function CHNGLCK

Identification
Function description
Change lock function
Functionality
Change lock function CHNGLCK is used to block further changes to the IED
configuration and settings once the commissioning is complete. The purpose is to block
inadvertent IED configuration changes beyond a certain point in time.
The change lock function activation is normally connected to a binary input.
When CHNGLCK has a logical one on its input, then all attempts to modify the IED
configuration and setting will be denied and the message "Error: Changes blocked" will
be displayed on the local HMI; in PCM600 the message will be "Operation denied by
active ChangeLock". The CHNGLCK function should be configured so that it is
controlled by a signal from a binary input card. This guarantees that by setting that signal
to a logical zero, CHNGLCK is deactivated. If any logic is included in the signal path to
the CHNGLCK input, that logic must be designed so that it cannot permanently issue a
IEC 61850 IEC 60617
identification identification
CHNGLCK -
1MRK 502 048-UUS A
ANSI/IEEE C37.2
device number
-
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