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Section 4
Service
Service the Drive Belt
(continued)
To remove the pulleys from their shafts, use a 1/8" Allen wrench to
remove two set screws from the belt groove of the larger pulley; use a
5/16" Allen wrench to remove the single set screw from the belt groove of
the smaller pulley.
When replacing the pulleys, seat the larger pulley completely against its
baseplate. The smaller pulley, however, is installed with 0.300" space
between it and the baseplate.
Calibrate Speed (RPM)
An external calibrated speed measuring device can be used to adjust the
actual platform speed so that the unit setpoint speed matches the external
device measurement. Calibration of the platform speed is performed at the
factory at 250 RPM. To change the actual platform speed, open the
Configuration menu by pressing the down arrow, up arrow, and the
Silence button, and then the down
arrow twice, in the sequence shown at
right.
The screen at right appears on the
display.
Then press the Speed button
beneath RPM.
The value shown on this screen is the present Speed setpoint. Using the up
and down arrows, increase or
decrease the platform speed until
the reading on an independent,
accurate speed measuring device
matches the Speed setpoint.
When finished, press any of the three buttons (Time, Speed, or Temp) to
save the new setpoint value and return to the previous screen, or press
nothing for about 15 seconds to save the new setpoint value and return to
the Operating Screen.
Thermo Scientific
Orbital Shaker
4-7
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