33
VersiStart i III
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 VersiStart i III 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 VersiStart i III 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
VersiStart i III will adjust future adaptive control starts and stops, based on information from the previous start. The gain setting affects
both starting and stopping performance.
x
If the motor accelerates or decelerates too quickly at the end of a start or stop, increase the gain setting by 5%~10%.
x
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.
8.5.4
Kickstart
Kickstart provides a short boost of extra torque at the beginning of a start, and can be used in conjunction with current ramp or constant
current starting.
Kickstart can be useful to help start loads that require high breakaway torque but then accelerate easily (for example helical rotor
pumps).
Cur
rent (
%
motor
ful
l l
oad c
ur
rent)
1
2
6
4
5
3
1: Kickstart Level (parameter 2E)
2: Kickstart Time (parameter 2F)
3: Initial Current (parameter 2C)
4: Start Ramp Time (parameter 2D)
5: Current Limit (parameter 2B)
6: Full voltage current
Rotor speed (% full speed)
