Stop Methods - GE ASTAT XL User Manual

7.5.3.2 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 ASTAT XL 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 ASTAT XL 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.
7.5.3.3 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 ASTAT XL 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.
7.5.4 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 flywheel loads such as presses).
7.6

Stop Methods

Soft starters offer a variety of methods for the control of motor stopping.
Stop Method
Coast To Stop
TVR Soft Stop
Adaptive Control
Brake
ASTAT XL User Manual
6
2
1
4
5
3
Rotor speed (% full speed)
Performance Result
Natural load run down
Extended run down time
Extended run down time according to selected deceleration profile
Reduced run down time
DET-812
Fout! Stijl niet gedefinieerd.
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
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