ABB ACS 800 Series, Firmware Manual

Page: 76 / 340

Program features
76
Stall protection
The drive protects the motor in a stall situation. It is possible to adjust the supervision
limits (torque, frequency, time) and choose how the drive reacts to a motor stall
condition (warning indication / fault indication & stop the drive / no reaction).
The torque and current limits, which define the stall limit, must be set according to
the maximum load of the used application.
Note: Stall limit is restricted by internal current limit TORQ_INV_CUR_LIM ( 03.04
LIMIT WORD 1 bit 4).
When the application reaches the stall limit and the output frequency of the drive is
below the stall frequency: Fault is activated after the stall time delay.
Settings
Parameters 30.10 to 30.12 .
Parameters 20.03 , 20.13 and 20.14 (Define the stall limit.)
Underload protection
Loss of motor load may indicate a process malfunction. The drive provides an
underload function to protect the machinery and process in such a serious fault
condition. Supervision limits - underload curve and underload time - can be chosen
as well as the action that the drive takes upon the underload condition (warning
indication / fault indication & stop the drive / no reaction).
Settings
Parameters 30.13 to 30.15 .
Motor phase loss
The Phase Loss function monitors the status of the motor cable connection. The
function is useful especially during the motor start: the drive detects if any of the
motor phases is not connected and refuses to start. The Phase loss function also
supervises the motor connection status during normal operation.
Settings
Parameter 30.16 .