Hi,

We have a GE Frame 6B 39 MW. Recently, our unit tripped with L5ESTOP1_ALM (E-STOP 1 PROTECTIVE CIRCUIT LATCHED) alam, even though there is no one pressed the emergency pushbutton on MarkVIe panel. No loose wiring or connection on the terminal board or emergency pushbutton terminal. Has anyone experienced the same event?

 

There are some plants that have an interlock other than an EStop wired to the EStop trip string. I have seen BOP trips wired in this string. Can you provide the wiring drawings for the EStop circuit or have a look?