Thermo Scientific 420 Series, Operating And Maintenance Manual

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Power Failure alerts the operator that electrical power to the shaker has
been interrupted and then restored while it was shaking.
While the system returns to normal operation when power is restored, the
alarm message remains and the audible tone continues to sound to alert
the operator. Both the display message and the audible tone are cleared by
pressing the Silence button.
Note The alarm will not occur if the power failure is less than 15 seconds
in duration.
s
Note If power is interrupted for two hours or more while the Shaker is
turned on but not shaking, a Power Fail alarm will occur. The purpose of
the alarm in this case is to alert the user that an extended duration power
failure occurred during the Hold interval after a timed shaking operation,
or during a period of incubation only. This alarm will also occur any time
the Shaker is turned on after an extended off period greater than 2 hours
(such as when the unit is shipped from the factory, or when it is returned
to use after a period of storage).
s
RPM Tracking alerts the operator by either alarm message shown at the
left that the platform speed has varied ±5 RPM.
Note A two-minute alarm delay is built into the software.
s
In the alarm state, the audible alarm is silenced by pressing the Silence
button, but rings back in about 15 minutes. The screen message and
warning lights, however, continue until the fault is corrected. Then, the
alarm message is cleared by pressing the Silence button.
Orbital Shaker 2-7 Thermo Scientific
Section 2
Operation
Power Failure
RPM Tracking