OPERATION
710-14888-00C EMX4i User Manual
53
8.9
Stop Methods
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.
Timed Voltage Ramp Soft Stop
Timed voltage ramp reduces the voltage to the motor gradually over a defined time.
This can extend the stopping time of the motor and may avoid transients on
generator set supplies.
NOTE
The load may continue to run after the stop ramp is complete.
Vo
lta
ge
(% f
ul
l v
ol
ta
ge
)
1
1:
Stop Time
(parameter 2J)
Time
Adaptive Control for Stopping
In an adaptive control soft stop, the EMX4i 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.
If adaptive control is selected, the first soft stop will use timed voltage ramp. This
allows the EMX4i to learn the characteristics of the connected motor. This motor
data is used by the EMX4i during subsequent adaptive control stops.
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.
If replacing a motor connected to an EMX4i programmed for Adaptive Control
starting or stopping, the starter will need to learn the characteristics of the new
motor. Change the value of parameter 1B
Motor Full Load Current
or parameter 2L
