Acceleration and Braking
Gentle acceleration and braking can be selected, when
centrifuging delicate samples. The gentle settings avoid
mixing of density gradients or breakup of pellets.
ACCEL
Acceleration key
: The Acceleration key controls rotor
acceleration up to 400 RPM. Press this key to toggle
between fast and slow acceleration.
•
Fast acceleration is selected when the indicator above
the
is lit.
•
Slow acceleration is selected when the indicator above
the
is lit.
Slow acceleration takes from 15 to 35 seconds to achieve
400 RPM, depending on the rotor and its contents. After
400 RPM, full acceleration is applied, until the set speed is
reached.
DECEL
Deceleration key:
The Deceleration key controls rotor
braking. Press this key to toggle between fast, slow, and
no brake.
•
Fast braking is selected when the indicator above the
is lit.
•
Slow braking is selected when the indicator above the
is lit.
•
When no indicators are lit, coast (no brake) is selected.
The rotor will coast from operating speed to a stop.
START
The Start key starts a run. A run is governed by the Set
parameters (manual or programmed). The green indicator
light blinks, until the rotor reaches 95% of the set run
speed. The light stays on until the end of the run.
STOP/LID
This Stop/Lid key stops a run or unlocks the cover when
the unit is not running. (A run will also stop automatically
when the set time has elapsed or the start key is released, in
the Short Spin mode.) The red indicator light flashes to
indicate the rotor is still slowing down (braking or
coasting). When the run ends, the red light stays on,
indicating that the rotor has stopped.
MARATHON Series Operation Manual
14
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