OPERATION
been tested on a different motor prior to actual installation, the starter will need to learn the characteristics of the new
motor. The EMX3 will automatically re-learn the motor's characteristics if parameter 1A
Motor Full Load Current
or
parameter 2K
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.
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 2K). The gain setting determines how much
the EMX3 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.
9.4
Stop Methods
Soft starters offer a variety of methods for the control of motor stopping.
Stop Method
Performance Result
Coast To Stop
Natural load run down
TVR Soft Stop
Extended run down time
Adaptive Control
Extended run down time according to selected deceleration profile
Brake
Reduced run down time
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.
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.
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.
Vo
lta
ge
(%
fu
ll v
olt
ag
e)
1
1:
Stop Time
(parameter 2I)
Time
34
| User Manual (710-04840-00M)
