ABB Relion REQ650, Applications Manual

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15.5 Change lock CHNGLCK
15.5.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Change lock function CHNGLCK - -
15.5.2 Application
Change lock function CHNGLCK is used to block further changes to the IED
configuration once the commissioning is complete. The purpose is to make it
impossible to perform inadvertent IED configuration and setting changes.
However, when activated, CHNGLCK will still allow the following actions that does
not involve reconfiguring of the IED:
• Monitoring
• Reading events
• Resetting events
• Reading disturbance data
• Clear disturbances
• Reset LEDs
• Reset counters and other runtime component states
• Control operations
• Set system time
• Enter and exit from test mode
• Change of active setting group
The binary input controlling the function is defined in ACT or SMT. The CHNGLCK
function is configured using ACT.
LOCK Binary input signal that will activate/deactivate the function, defined in ACT or
SMT.
ACTIVE Output status signal
OVERRIDE Set if function is overridden
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
1MRK 505 291-UEN A
Section 15
Basic IED functions
303
Application manual