NOTE!
If you use long motor cables (max. 100 m) with small drives (≤1.5 kW), the motor
current that the drive measures can be much higher than the actual motor current.
It is because there are capacitive currents in the motor cable.
P3.9.4.2 UNDERLOAD PROTECTION: FIELD WEAKENING AREA LOAD (ID 714)
You can set the value of this parameter between 10.0 and 150.0% x TnMotor. This value is the
limit for the minimum torque when the output frequency is above the field weakening point.
If you change parameter P3.1.1.4 (Motor Nominal Current), this parameter goes
automatically back to its default value. See 9.9.3 Underload protection.
ID714
ID715
f
5 Hz
Underload area
Torque
Field weakening
point
Fig. 59: Setting of the minimum load
P3.9.4.4 UNDERLOAD PROTECTION: TIME LIMIT (ID 716)
You can set the time limit between 2.0 and 600.0 s.
This is the maximum time for an underload status to be active. An internal counter counts
the underload time. If the value of the counter goes above this limit, the protection causes
the drive to trip. The drive trips as is set in parameter P3.9.4.1 Underload Fault. If the drive
stops, the underload counter goes back to 0.
PARAMETER DESCRIPTIONS VACON · 281
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