Nidec Digistart D4 User Manual

Operation
Timed Voltage Ramp Soft Stop
Timed voltage ramp stopping 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.
Voltage (% full voltage)
1
1: Stop Time (parameter 2G)
Time
Adaptive Control for Stopping
In an adaptive control soft stop, the soft starter controls the current in order to stop the
motor within a specified time. 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
soft starter to learn the characteristics of the connected motor. This motor data is used by
the soft starter during subsequent adaptive control stops.
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 a soft starter 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 2I Adaptive Control Gain to
initiate the re-learning process. The next start will use constant current and the next stop
will use timed voltage ramp.
Speed
100%
90%
80%
70%
60%
50%
40%
30%
20%
10%
0
18736.A
1
2
1. Constant Deceleration
2. Stop Time (parameter 2G)
Time
Adaptive Control is ideal for pumping applications, where it can minimise the damaging
effects of fluid hammer.
41

Nidec Digistart D4 Specifications

General

Brand	Nidec
Model	Digistart D4
Category	Controller
Language	English