Figure 42: Calculation Example - KEB COMBIVERT F6 Programming Manual

Operating modes
Calculation example with timing
21
1

Figure 42: Calculation example

Setting of an acceleration profile according to Figure 42. The setpoint speed n is
known as well as the three periods t
n = 1000rpm = 16.67 s
Calculate the constant acceleration a in the second period t
=
��1
2
The resulting value for the acceleration is entered in co48.
Calculation of the jerk r
1 =
The calculated value for the jerk r1 can be adjusted in co52.
Calculation of the jerk r
3 =
The calculated value for the jerk r3 can be adjusted in co53. For the sake of com-
pleteness, when you want, calculate the speeds n
��1 =
��2 = ��1 + ∗ ��2
��2 = 2.08�� − 1 + 4.17�� − 2 ∗ 2�� = 10.42�� − 1
The formulas are also valid for the case if there is no constant acceleration. Then
there is no smooth transition of the s-curves. In this case t
150
1fghfh
-1
, t = 1 s, t
1
��
��3
+ ��2+
2
in the first period t
1
�� 4.17��
1 =
��1 1��
in the third period t
3
�� 4.17��
1 =
��3 3��
��∗��1
��1 =
2
, t and t .
1 2 3
= 2 s, t = 3 s
2 3
−1
16.67��
−2
= = 4.17��
1�� 3��
+ 2��+
2 2
:
1
−2
−3
= 4.17��
:
3
−2
−3
= 1.39��
and n
1 2
−2
4.17�� ∗ 1��
−1
= 2.08��
2
:
2
at the changes:
is 0.
2
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