GE ASTAT XL User Manual page 32

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.
7.6.1 Coast to Stop
Coast to stop lets the motor slow at its natural rate, with no control from the soft starter. The time
required to stop will depend on the type of load.
7.6.2 TVR Soft Stop
Timed voltage ramp reduces the voltage to the motor gradually over a defined time. The load may
continue to run after the stop ramp is complete.
Timed voltage ramp stopping can be useful for applications where the stop time needs to be extended,
or to avoid transients on generator set supplies.
7.6.3 Adaptive Control for Stopping
In an adaptive control soft stop, the ASTAT XL controls the current in order to stop the motor within a
specified time and using a selected deceleration profile. Adaptive Control can be useful in extending
the stopping time of low inertia loads.
NOTE
Adaptive control does not actively slow the motor down and will not stop the motor faster
than a coast to stop. To shorten the stopping time of high inertia loads, use brake.
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.
Every application has a particular stopping profile, based on characteristics of the load and the motor.
Adaptive Control offers three different stopping profiles. Choose the adaptive control profile that best
matches your application requirements.
7.6.3.1 Adaptive Control
To use Adaptive Control to control stopping performance:
1. Select Adaptive Control from the Stop Mode menu (parameter 2H)
2. Set the desired Stop Time (parameter 2I)
3. Select the required Adaptive Stop Profile (parameter 2K)
100%
90%
80%
70%
60%
50%
40%
30%
20%
10%
0
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ASTAT XL User Manual
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Time
4
1 2 3
Time
DET-812
Fout! Stijl niet gedefinieerd.
1: Stop time (parameter 2I)
Adaptive Control stop profile (parameter 2K):
1. Early deceleration
2. Constant deceleration
3. Late deceleration
4. Stop time (parameter 2I)