Specifications

Operation Softstart UK
• Adaptive Control for Starting
In an adaptive control soft start, the LV-DS adjusts the current in order to start the motor within a specified time
and using a selected acceleration profile.
CAUTION
Adaptive Control cannot start the motor faster than a direct on-line (DOL) start. If the start ramp time
(parameter 2D) is shorter than the motor's DOL start time, starting current may reach DOL levels.
Every application has a particular starting profile, based on characteristics of the load and the motor. Adaptive
Control offers three different starting profiles, to suit the requirements of different applications. Selecting a
profile that matches the inherent profile of the application can help smooth out acceleration across the full start
time. Selecting a dramatically different Adaptive Control profile can somewhat neutralise the inherent profile.
The LV-DS monitors the motor's performance during each start, to improve control for future soft starts.
Adaptive Control
To use Adaptive Control to control starting performance:
1. Select Adaptive Control from the Start Mode menu (parameter 2A)
2. Set the desired Start Ramp Time (parameter 2D)
3. Select the desired Adaptive Start Profile (parameter 2J)
4. Set a start Current Limit (parameter 2B) sufficiently high to allow a successful start. The first Adaptive
Control start will be a Constant Current start. 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 starts.
Speed
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Adaptive start profile (parameter 2J):
1. Early acceleration
2. Constant acceleration
3. Late acceleration
4. Start ramp time (parameter 2D)
Time
How to Select the Adaptive Control Start Profile
The best profile will depend on the exact details of each application.
Some loads, such as submersible pumps, should not be run at slow speeds. An early acceleration profile will
raise the speed quickly, then control acceleration through the rest of the start.
NOTE
Adaptive Control will control the load according to the programmed profile. Start current will vary
according to the selected acceleration profile and the programmed start 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.
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.
Fine-tuning Adaptive Control
If the motor does not start or stop smoothly, adjust the adaptive control gain (parameter 2L). The gain setting
determines how much the LV-DS will adjust future adaptive control starts and stops, based on information from
the previous start. The gain setting affects both starting and stopping performance.
• If the motor accelerates or decelerates too quickly at the end of a start or stop, increase the gain setting by
5%~10%.
• If the motor speed fluctuates during starting or stopping, decrease the gain setting slightly.
NOTE
Changing the gain setting resets the starter's adaptive control learning. The first start after changing
the gain will use constant current.
26/64 710-15797-00A – LV-DS User Manual