ABB +N5600 - Page 55

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