• built-in real time clock (in operation/out of order).
• external time synchronization (in operation/out of order).
Events are also generated:
• whenever any setting in the IED is changed.
The internal events are time tagged with a resolution of 1 ms and stored in a list. The list
can store up to 40 events. The list is based on the FIFO principle, that is, when it is full, the
oldest event is overwritten. The list contents cannot be modified, but the whole list can be
cleared using the Reset menu in the LHMI.
The list of internal events provides valuable information, which can be used during
commissioning and fault tracing.
The information can, in addition to be viewed on the built in HMI, also be retrieved with
the aid of a PC with PCM600 installed and by using the Event Monitoring Tool. The PC
can either be connected to the front port, or to the port at the back of the IED.
23.3 Change lock CHNGLCK
23.3.1 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
Section 23 1MRK 506 369-UUS -
Security
892 Line distance protection REL670 2.2 ANSI
Application manual
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