ABB ACS880-01 Series, Firmware Instructions

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56 ESP program features

Overload recovery sequence
The Overload protection function protects the motor against overheating due to
continuous exposure to high electrical current in absence of appropriate cooling. An
overload situation can occur for different reasons and is more likely to occur on new
wells due to frequent intake of solid parts through the pump. This results in clogging
and excessive inertial load which in turn, results in overheating of the motor. Clogging
can be inferred by the detection of an overload condition.
Some typical overload recovery sequence scenarios.
If the condition continues after the overload recovery sequence is complete, the drive
generates a warning or a trip.
Sequence Operation
1 Normal operation -> Overload -> Back to normal at recovery speed ->
Original speed
2 Overload -> Not ok at recovery speed -> Original speed, but overload
warning is active.
3 Underload -> Not ok at recovery speed -> Trip to fault.
0
17.50
35.00
52.50
15.80
25.80
35.8 45.80
55.82
Current spike above limit
Automatic safe
speed reaction
Fault trip