Larsen & Toubro C*2000 Series, User Manual

Page: 96 / 183

Chapter 7 Basic Functions
7-15
Cx2000 AC Drive
Accel/Decel curve setting
Group Code Item Range Initial Unit
Function group 1 F 2 Accel pattern 0 Linear curve operation 0
F 3 Decel pattern 1 S curve operation
Function group 2 H17 S-Curve Accel/Decel
start curve
0 ~ 100 40 %
H18 S-Curve Accel/Decel
end curve
40 %
Accel pattern and Decel pattern can be settable at F2, F3 in function group 1.
Linear curve operation: output frequency increases or decreases linearly according to a certain
amount. It is usually used for constant torque.
S curve operation:
This curve allows the motor to accelerate and decelerate smoothly. And it is
applied to application occasion such as lifting load or elevator.
Warning
When S-curve is used, the actual Accel/ Decel time is longer than the value set by user.
O p e ra tin g co m m a n d
F re q .
A cce l tim e D e ce l tim e

H17 sets the starting ratio between S-curve and Linear in 1/2 of Accel/Decel Ref. Frequency, for smooth
Accel/Decel starting, increase H17 to extend S-curve ratio.
 H18 sets the ending ratio between S-curve and Linear in 1/2 of Accel/Decel Ref. Frequency. For smooth
and accurate speed arrival and stopping, increase H18 to extend S-curve ratio.
1/2 of
Accel/Decel
Ref.Freq.
Freq
H17
H17 H18 H18
Accel/Decel
Ref.Freq.
Accel
End
Decel
Start
Decel
End