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Motor Pump Enhanced Protection Application
SV9000
6.2.3 Group 4, Drive Control Parameters
4.1
Acc./Dec. ramp 1 shape
4.2
Acc./Dec. ramp 2 shape
The start and end of the acceleration and deceleration ramps can be smoothed with these
parameters. Setting value 0 gives linear ramp shape, which causes acceleration and
deceleration to act immediately to the changes in the reference signal with the time
constant set by the parameter 1.3 and 1.4 (4.3 and 4.4).
Setting value 0.1—10 seconds for parameters 4.1 or 4.2 causes linear acceleration or
deceleration to adopt an S-shape. Parameters 1.3 and 1.4 (4.3 and 4.4) determines the
time constant of acceleration/deceleration in the middle of the curve. See figure 6.2-13.
Hz
0
Par. 4.1 (Par. 4.2)
Par. 4.1 (Par. 4.2)
t
Figure 6.2-13: S-Shaped Acceleration/Deceleration
4.3
Acceleration time 2
4.4
Deceleration time 2
These values correspond to the time required for the output frequency to accelerate from
the set minimum frequency (par. 1.1) to the set maximum frequency (par. 1.2). These
times give the possibility to set two different acceleration/deceleration time sets for one
application. The active set can be selected with the programmable digital input of this
application, see parameter group 11.
Acceleration/deceleration times can be reduced with an external free analog input signal,
see parameters 2.13 and 2.14.
4.5
Brake chopper
0 = No brake chopper
1 = Brake chopper and brake resistor installed
2 = External brake chopper
When the frequency converter is decelerating the motor, the inertia of the motor and the
load are fed into the external brake resistor. This enables the frequency converter to
decelerate the load with the torque equal to that of acceleration, if the brake resistor is
selected correctly. See separate Brake resistor installation manual.