Eaton SLX9000 - Figure 9-22: Setting of Minimum Load; Figure 9-23: Underload Time Counter Function

SLX9000 Adjustable Frequency Drives User Manual
9-30 For more information visit: www.eaton.com
MN04003020E
January 2009
Figure 9-22: Setting of Minimum Load
Figure 9-23: Underload Time Counter Function
2.7.17 Underload protection, zero frequency load ID715
The torque limit can be set between 5.0 and 150.0% x T
nMotor
.
This parameter gives value for the minimum torque allowed with zero frequency.
See Figure 9-22.
If you change the value of parameter 2.1.9 (Motor nominal current), this parameter is
automatically restored to the default value.
2.7.18 Underload time ID716
This time can be set between 2.0 and 600.0 s.
This is the maximum time allowed for an underload state to exist. An internal up/
down counter counts the accumulated underload time. If the underload counter
value goes above this limit the protection will cause a trip according to parameter
2.7.15). If the drive is stopped, the underload counter is reset to zero. See Figure 9-23.
Torque
Par. ID714
Par. ID715
Underload Area
Field Weakening
Point Par. ID602
5 Hz
f
Underload
Time Counter
Trip Area
Par. ID716
Underload
No Underload
Time
Trip/Warning
Par. ID713