Specifications

Operation Softstart UK
• Adaptive Control for Stopping
In an adaptive control soft stop, the LV-DS controls the current in order to stop the motor within a specified time
and using a selected deceleration profile. Adaptive Control can be useful in extending the stopping time of low
inertia loads.
NOTE
Adaptive control does not actively slow the motor down and will not stop the motor faster than a
coast to stop. To shorten the stopping time of high inertia loads, use brake.
CAUTION
Adaptive Control controls the motor's speed profile, within the programmed time limit. This may
result in a higher level of current than traditional control methods.
Every application has a particular stopping profile, based on characteristics of the load and the motor.
Adaptive Control offers three different stopping profiles. Choose the adaptive control profile that best matches
your application requirements.
Adaptive Control
To use Adaptive Control to control stopping performance:
1. Select Adaptive Control from the Stop Mode menu (parameter 2H)
2. Set the desired Stop Time (parameter 2I)
3. Select the required Adaptive Stop Profile (parameter 2K)
Speed
10
0%
90
%
80%
70%
60%
50%
40%
30%
20%
10%
0
1 2
3
4
Adaptive Control stop profile (parameter 2K):
1. Early deceleration
2. Constant deceleration
3. Late deceleration
4. Stop time (parameter 2I)
Time
Pump stopping
The hydraulic characteristics of pump systems vary considerably. This variation means the ideal deceleration
profile and stop time will vary from application to application. The table provides guidelines on selecting
between Adaptive Control deceleration profiles, but we recommend testing the three profiles to identify the best
profile for the application.
Adaptive Stop Profile
Application
Late Deceleration
High head systems where even a small decrease in motor/pump speed results
in a rapid transition between forward flow and reverse flow.
Constant Deceleration
Low to medium head, high flow applications where the fluid has high
momentum.
Early Deceleration
Open pump systems where fluid must drain back through the pump without
driving the pump in reverse.
The first Adaptive Control stop will be a normal soft stop. This allows the LV-DS to learn the characteristics of
the connected motor. This motor data is used by the LV-DS during subsequent Adaptive Control stops.
NOTE
Adaptive Control will control the load according to the programmed profile. Stopping current will vary
according to the selected deceleration profile and stop time.
If replacing a motor connected to a LV-DS programmed for Adaptive Control starting or stopping, or if
the starter has been tested on a different motor prior to actual installation, the starter will need to learn
the characteristics of the new motor. The LV-DS will automatically re-learn the motor's characteristics if
parameter 1A Motor Full Load Current or parameter 2L Adaptive Control Gain is changed.
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