GE Industrial Solutions Entellisys 5.0 User Manual - Manual (Page 135)

Zone Selective Interlock 135
7
7.4.7.6 Operation events
This category includes four events. “X” in the descriptions below stands for zone number and it
can assume values of 1 to 4.
•
ZSI Zone X Operation. This event is logged when the ZSI zone detects that at least one of the
member circuit breakers is in pickup condition and it updates all upstream circuit breakers
with new time delays. There can be a total of 4 variants of this event, one for each zone.
7.4.8 Troubleshooting
ZSI operation event is logged while no circuit breaker is in pickup condition
•
There is no communication with at least one EntelliGuard Messenger corresponding to the
ZSI zone member circuit breaker. Verify that all Messengers corresponding to zone's member
circuit breakers are communicating. This information is available in the System Health
screen (see
System health on page 221 ).
ZSI operation events are logged very frequently
•
Communication with EntelliGuard Messenger is intermittent. Verify that all Messengers for
the ZSI zone’s member circuit breakers are communicating without problems. This
information is available in System Health screen (see
System health on page 221 ).
No ZSI operation events are logged but are expected
•
Zone is disabled. Verify whether ZSI zone is enabled. This information is available in the
Advanced Protection screen (see
Configuring ZSI parameters on page 131 ).
•
ZSI configuration file is corrupted. Verify the event log for the corresponding event.
•
ZSI protection is not optioned. Check if current option string enables ZSI protection. This
information is available in the Options tab of the Maintenance screen.