We have recently (in the last couple of weeks) started getting 3 "TCE1 Slow synch check 25X relay" diagnostic alarms on 4 of our 8 Frame 7EA DLN1 units that have Mark V. It has never happened on our other 4 units.
The event is somewhat random, in that it happens sometimes but not others when attempting to close generator circuit breaker using autosynch.
It is getting progressively more frequent and is now sometimes followed with "AUTO SYNCHRONIZING LOCKOUT" (L86S). Up until today the breaker closed anyway. The operator turns synch mode to "OFF" and does multiple "master resets". The diagnostic 25X alarms clear within about a minute. Once they are no longer active the L86S can be cleared with Master Reset.
Today, autosynch would not close the breakers due to the L86S alarm. Autosynch was turned off until the 25X diagnostics cleared, the L86S was cleared, then autosynch selected again.
After doing this sequence several times, the breakers all got closed.
What are your thoughts?
The event is somewhat random, in that it happens sometimes but not others when attempting to close generator circuit breaker using autosynch.
It is getting progressively more frequent and is now sometimes followed with "AUTO SYNCHRONIZING LOCKOUT" (L86S). Up until today the breaker closed anyway. The operator turns synch mode to "OFF" and does multiple "master resets". The diagnostic 25X alarms clear within about a minute. Once they are no longer active the L86S can be cleared with Master Reset.
Today, autosynch would not close the breakers due to the L86S alarm. Autosynch was turned off until the 25X diagnostics cleared, the L86S was cleared, then autosynch selected again.
After doing this sequence several times, the breakers all got closed.
What are your thoughts?