Description Of Certain Events With Respect To The Control System - Thermo Scientific Sorvall T3 User Manual

Chapter 4
Instructions for Use
Description of Certain
Events with Respect
to the Control System
Start and acceleration phase
During the run
Stop and braking
(deceleration) phase
4-4 T3/G3
When the start button is pressed, the centrifuge will begin to accelerate
the rotor. At this point the run timer will start and the middle display
will begin to show remaining run time. The upper display will show
either actual speed or actual maximum RCF values, whichever is
currently selected. The lower display shows the given acceleration
profile, and the LED corresponding to the acceleration button is
illuminated.
Set error During acceleration, the centrifuge automatically detects the rotor type
and, therefore, its maximum allowed speed. If the operator sets a speed
exceeding this, the centrifuge stops acceleration when the maximum
allowed speed is reached, ensuring the operator's safety. The display will
blink and an audible alarm will invite the operator to correct the speed
setting to a proper value.
During the run, the upper display will show either actual speed or
actual maximum RCF values, whichever is currently selected. The
middle display will show either remaining time (timed run) or elapsed
time ('hold' and 'pulse' runs).
During a run, the middle display will always show time. The user
cannot change the display to show the given 'radius' value during a
run.
Most set parameters can be changed during a run when the selected
program is not locked. Set speed can be changed by selecting speed as
the control parameter for the upper display, then by pushing the up or
down arrow, or turning the knob. Set run time can be changed by
pressing the up or down arrow corresponding to the middle display. Set
deceleration profile can be changed by first selecting the deceleration
profile (pushing the 'B' button) and then using the up/down arrows, or
turning the knob.
When the stop button is pressed (or when the run timer reaches zero),
the centrifuge will begin to decelerate the rotor. At this point the run
timer will stop and the middle display will begin to show elapsed
braking time. The upper display will show either actual speed or actual
maximum RCF values, whichever is currently selected. The lower
display shows the given deceleration profile, and the LED
corresponding to the acceleration button is illuminated.
End of run At the end of a run, after the rotor has been decelerated to rest, the
centrifuge will produce an audible 'beep' and the middle display will
show the word 'End'. Pressing any button or opening the lid will bring
the displays back to their normal 'at rest' configuration (display of set
parameters).
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