8.8.1
Adaptive Control for Starting
In an adaptive control soft start, the ASA 4.0 Advanced adjusts the current in order to start the motor within a specified time and using a
selected acceleration profile.
NOTE
The ASA 4.0 Advanced will apply the current limit on all soft starts, including adaptive control. If the current limit is too low or
the start ramp time (parameter 2B) is too short, the motor may not start successfully.
Speed
0
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
04
82
7.
C
1
2
3
4
Adaptive Start Profile
(parameter 2E):
1. Early Acceleration
2. Constant Acceleration
3. Late Acceleration
4.
Start Ramp Time
(parameter 2B)
Time
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
ASA 4.0 Advanced 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
The ASA 4.0 Advanced tunes Adaptive Control to match the motor. Changing the following parameters will reset Adaptive
Control and the first start/stop cycle will use constant current start/timed voltage ramp stop: 1B
Motor Full Load Current
, 2D
Current Limit
, 2L
Adaptive Control Gain
.
8.8.2
Constant Current with 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
(%
mot
or
ful
l load c
ur
rent
)
1
2
6
4
5
3
1:
Kickstart Level
(parameter 2G)
2:
Kickstart Time
(parameter 2F)
3:
Initial Current
(parameter 2C)
4:
Start Ramp Time
(parameter 2B)
5:
Current Limit
(parameter 2D)
6: Full voltage current
Rotor speed (% full speed)
Time
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ASA 4.0 Advanced
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