Fig. 20: The motor switch between the drive and the motor
A. The motor switch
B. Mains
P3.1.2.7 LOAD DROOPING (ID 620)
The Load drooping function enables a speed drop. This parameter sets the drooping in
percentage of the nominal torque of the motor.
You can use this function when a balanced load is necessary for mechanically connected
motors. This is called static drooping. You can also use the function when a dynamic
drooping is necessary because the load changes. In static drooping, the Load Drooping Time
is set to 0, so that the drooping cannot decay. In dynamic drooping, the Load Drooping Time
is set. The load is momentarily drooped with energy from the system inertia. This decreases
the current torque spikes when the load changes suddenly.
If the motor has a nominal frequency of 50 Hz, the motor is loaded with the nominal load
(100% of the torque), and Load Drooping is set to 10%, the output frequency is let to decrease
5 Hz from the frequency reference.
Torque
Output Frequency
Load Drooping Time
(ID656)
Fig. 21: The Load drooping function
PARAMETER DESCRIPTIONS VACON · 227
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