GE BreakMaster Installation And Maintenance Manual page 26

BreakMaster Load Interrupter Switch
Sequence of Operation for Controller MX250-LIS
See GE Zenith document 71R-2000A for more details
(W) Time Delay to open Normal Source to ensure voltage and frequency stabilization
Emergency Source Not Available
Nothing Happens. STOP!
Is Normal Source (S1) available?
No
Emergency Switch
stays as is. END!
When Normal Source voltage or frequency
falls below the preset "Fail" values
(P) Time Delay to start Emergency Source
of Emergency Source before transfers
Time Delay (DW) before closing Emergency Switch.
Is Emergency Source (S2) available?
No
Yes
Transfer to Normal
Source (S1)
Emergency Source Stop Delay Time (U) – Cool Down
Emergency Source Available
S1>S2, SOL timer starts
Normal Source (S1) Switch Open
Emergency Switch Close
When Normal Source returns
Time Delay (T) to confirm availability of stable
Normal Source (S1). S2>S1, SOL Timer start
Emergency Switch Open
Time Delay (DT) for closing Normal Switch
S2>S1, SOL Timer start
Normal Switch Close
Yes
25