Current spike above limit
Automatic safe
speed reaction Fault trip
52.50
35.00
17.50
0
15.80
25.80
35.8
45.80
55.82
Some typical overload recovery sequence scenarios.
OperationSe-
quence
Normal operation → Overload → Back to normal at recovery speed → Original speed1
Overload → Not ok at recovery speed → Original speed, but overload warning is
active
2
Underload → Not ok at recovery speed → Trip to fault3
If the condition continues after the overload recovery sequence is complete, the
drive generates a warning or a trip.
The figure below illustrates various scenarios with overload ride through recovery
sequence.
Recovery - Warning
(not recovered)
Recovery - Warning
(recovered)
Overload safe
speed time
Delay
time
Delay
time
Overload safe
speed time
Load signal / Limit
Reference
Overload recovery speed Hz
Overload delay
Overload act
Overload save speed active
Warning
Fault
Shutdown
60 ESP program features
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