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Motor Pump Enhanced Protection Application
SV9000
7.15
Underload prot., field weakening area load
Operation:
0 = Not in use
1 = Warning
2 = Fault
Tripping and warning will display the same message code. If tripping is set active the drive
will stop and activate the fault stage.
Deactivating the protection by setting the parameter to 0 will reset the underload time
counter to zero.
7.16
Underload protection zero frequency load
The torque limit can be set between 10.0—150 % x T
nMotor
.
This parameter gives value for the minimum torque allowed with zero frequency. See
figure 6-30. If parameter 1.13 is adjusted this parameter is automatically restored to the
default value.
Torque
5 Hz
Field weakening point
Par. 6.3
f (Hz)
Underload area
Par. 7.15
Par. 7.16
Figure 6.2-23: Setting of Minimum Load
7.17
Underload time
This time can be set between 2.0—600.0 s.
This is the maximum allowed time for an underload state. There is an internal up/down
counter to accumulate the underload time. See figure 6.2-24. If the underload counter
value goes above this limit the protection will cause a trip (refer to the parameter 7.14). If
the drive is stopped the underload counter is reset to zero.