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Safety
Rating
Mechanical
Information
Data
Installation
Adaptive Control will control the load according to the programmed profile. Start current will vary according to the
NOTE
selected acceleration profile and the programmed start time.
If replacing a motor connected to a Digistart IS 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 Digistart IS will automatically re-learn the motor's characteristics if Pr 1A Motor Full Load Current or Pr
2L Adaptive Control Gain is changed.
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.
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.
CAUTION
Fine-tuning adaptive control
If the motor does not start or stop smoothly, adjust the adaptive control gain (Pr 2L). The gain setting determines how much the
Digistart IS 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% to 10%.
If the motor speed fluctuates during starting or stopping, decrease the gain setting slightly.
Changing the gain setting resets the starter's adaptive control learning. The first start after changing the gain will use
NOTE
constant current.
7.2.4
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).
Figure 7-4 Current ramp soft start with kickstart
Rotor speed (% full speed)
Kickstart subjects the mechanical equipment to increased torque levels. Ensure the motor, load and couplings can
handle the additional torque before using this feature.
CAUTION
7.3
Stop methods
Soft starters offer a variety of methods for the control of motor stopping.
Table 7-3 Soft stop methods
Stop Method
Coast To Stop
TVR Soft Stop
Adaptive Control
Brake
Soft starters are often used in pumping applications to eliminate the damaging effects of fluid hammer. Adaptive Control should be
the preferred stop method for these applications.
To stop the motor, press the STOP button on the keypad or activate the Stop remote input. The motor will stop using the stop
mode selected in Pr 2H.
Digistart IS User Guide
Issue: 4
Electrical
Keypad
Quick Start
Installation
and
Commissioning
Status
6
2
1
4
5
3
Natural load run down
Extended run down time
Extended run down time according to selected deceleration profile
Reduced run down time
www.controltechniques.com
Operation
Programming Diagnostics Application
1: Kickstart level (Pr 2F)
2: Kickstart time (Pr 2G)
3: Initial current (Pr 2C)
4: Start ramp time (Pr 2D)
5: Current limit (Pr 2B)
6: Full voltage current
Performance Result
Technical
Maintenance Options
Examples
Data
39
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