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VACON® 3000
Application Guide
•
INU application: P3.1.2.7.5
Use this parameter to adjust the voltage of the motor when the motor is loaded.
The motor nameplate speed is used to calculate the nominal slip. This value is used to adjust the voltage of the motor when loaded.
The nameplate speed is sometimes a little inaccurate and this parameter can therefore be used to trim the slip. Reducing the slip
adjust value increases the motor voltage when the motor is loaded. Value 100% corresponds to nominal slip at nominal load.
7.124 (ID 620) Load Drooping
Location in the menu:
•
INU application: P3.1.2.4.6
Use this parameter to enable the Load Drooping function. The Load drooping function enables a speed drop as a function of load.
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.
Illustration 33: The Load drooping function
A
Load Drooping Time (ID 656)
B
Output Frequency
7.125 (ID 626) Acceleration Compensation TC
Location in the menu:
•
INU application: P3.1.2.4.3
Use this parameter to set the inertia compensation to make the speed response during acceleration and deceleration more accu-
rate.
The time is defined as acceleration time to nominal speed with nominal torque. This feature is used when the inertia of the system is
known to achieve the best speed accuracy at alternating references.
Acceleration Compensation TC = J ×
, where:
•
J = System inertia (kg×m
•
f
= Motor nominal frequency (Hz)
nom
•
T
= Motor nominal torque
nom
•
P
= Motor nominal power (kW)
nom
190 | Danfoss A/S © 2021.09
A
C
2π × f
2π × f
nom
= J ×
T
P
nom
2
)
B
C
Torque
2
nom
nom
Parameter descriptions
AB319735759636en-000101 / DPD01822
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