Sigma 8KBS - Acceleration and Deceleration Curves

Refrigerated Centrifuge Sigma 8KS
Refrigerated Centrifuge Sigma 8KBS
11 Appendix
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Version 08/2012, Rev. 2.5 of 02/07/2018 • sb
Translation of the original operating manual, part no. 0702502
Pos: 248 /100 Sig ma/100 BA Ze ntrifugen Sig ma (Standardm odule)/110 Anha ng/110-0031 Beschleunigu ngs- und Bre mskurven Spinco ntrol S @ 28\ mod_1405320 708834_68.docx @ 195181 @ 2 @ 1
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11.3 Acceleration and deceleration curves
Linear as well as quadratic curves are numbered in the direction of
increasing acceleration (from right to left).
The deceleration curves are inverted images of the acceleration curves and
are assigned the same numbers. An exception is curve 0. It decelerates
brakeless (spin-out).
In general, the runtime, until the set speed is reached, depends on the
moment of inertia of the rotor.
Linear curves
The slope of the fixed acceleration curves defines the time that is required
to accelerate the rotor by 1,000 rpm.
Curve 9 is a special case compared to the other curves. The centrifuge
accelerates with maximum power. The runtime, until the set speed is
reached, depends solely on the moment of inertia of the rotor.
Linear curve no.
Slop
0
4 [rpm/sec]
1
6 [rpm/sec]
2
8 [rpm/sec]
3
17 [rpm/sec]
4
25 [rpm/sec]
5
33 [rpm/sec]
6
50 [rpm/sec]
7
100 [rpm/sec]
8
200 [rpm/sec]
9
1.000 [rpm/sec]
Fig. 49: Slope of linear curves
Quadratic curves
Curve 19 is a special case compared to the other curves. The centrifuge
accelerates with maximum power. The runtime depends solely on the
moment of inertia of the rotor.
Quadratic curve no.
Time until 1,000 rpm
Slope as of 1,000 rpm
10
500 sec
4 [rpm/sec]
11
333 sec
6 [rpm/sec]
12
250 sec
8 [rpm/sec]
13
118 sec
17 [rpm/sec]
14
80 sec
25 [rpm/sec]
15
60 sec
33 [rpm/sec]
16
40 sec
50 [rpm/sec]
17
20 sec
100 [rpm/sec]
18
10 sec
200 [rpm/sec]
19
2 sec
1.000 [rpm/sec]
Fig. 50: Slope of quadratic curves