Section 3 1MRK 500 124-UEN
HMI500
64 Operation Manual
Distributed busbar protection REB500
Figure 50 Test mode
Table 15 Buttons in Test mode dialog
Button Description
Unblock all relays Restores the relays to normal operation and their statuses can change again.
Block all relays Prevents the statuses of all relays for which outputs have been configured
from being changed.
Force security
events
See Cyber security guideline
Block all tripping
relays
Prevents the statuses of all relays from being changed with the exception of
41810_In service, 41835_Test generator active and 41410_Output relays
blocked.
Reset all
overridden relays
Returns all inputs and outputs which had statuses impressed on them for test
purposes to their original states.
An output relay can be set or reset either directly (e.g. by setting
an output relay) or indirectly (e.g. via an input or by a protection
function).
The greatest care must be taken when using the test mode,
especially when the protection system is in operation.
Blocking by the test generator takes precedence over all other
functions, i.e. neither a protection function nor an External TRIP
signal can initiate a trip.
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