Heraeus CRYOFUGE 6000i, Operating Instructions Manual

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Acceleration and Deceleration Curves
35
Acceleration and Deceleration Curves
The CRYOFUGES are equipped with 9 different acceleration and deceleration curves for optimum use of
the different applications.
Design of the curves
The curves contain a smooth start-up and smooth slow-down phase and a phase with high acceleration.
The resonance speeds determined by the laws of physics lie in the phase of high acceleration and high
deceleration, so that they have no disturbing effects on samples and the motor system.
Choice of curves
Curve No. 9 has the shortest acceleration or deceleration time, curve no. 1 has the longest acceleration or
deceleration time. Deceleration curve 0 means non-decelerated slow-down, and can therefore not be re-
produced.
The quickest deceleration can be carried out using the quick stop key, in which the rotor is brought to a
standstill with the maximum brake force possible.
Whirl production on deceleration
With swing rotors the back-swing of the buckets starts at approx. 200 rpm. As a result, different accelera-
tions effect the samples which could cause partial back-mixing. The whirling can be suppressed more effec-
tively, the slower and more even the rotor comes to a standstill (e.g. deceleration curves 1 to 5).