ABB +N5600 Firmware Instructions page 55

The figures below illustrates various scenarios with underload ride through recovery
sequence.
Load signal / Limit
Reference + Boost %
Reference
Underload delay
Underload act
Underload recovery active
Underload boost active
Underload drop active
Warning
Fault
Shutdown
Load signal / Limit
Reference + Boost %
Reference
Drop speed Hz
Underload delay
Underload act
Underload recovery active
Underload boost active
Underload drop active
Warning
Fault
Shutdown
Recovery - Fault
(not recovered)
Delay
Recovery
time
cycle time
Recovery - Warning
(not recovered)
Delay Recovery
time cycle time
ESP program features 55
Recovery - Fault
(recovered)
Reset
attempts
Recovery - Warning
(recovered)
Reset
attempts