Thermo Scientific 420 Series, Operating And Maintenance Manual

Page: 23 / 66

Both audible and visual alarm warnings for these nine parameters are
provided by the Orbital Shaker. Visual flashing of the three diagonal
indicator lights on the control panel, a progression of text messages on the
display, and an audible tone alerts the operator that an alarm condition has
occurred or currently exists.
For convenience, the audible tone is silenced by pressing the Silence
button, but rings back in about 15 minutes. However, the alarm warning
indicator lights and alarm messages continue until the alarm condition is
corrected by the operator. Then, pressing the Silence button clears the
message from the display (‘Check Belt’ and ‘Check Fuse’ alarms require the
unit to be turned off, then on again to remove the message from the
display).
As discussed in the Configuration section of this manual, the audible alarm
feature may be turned off to suit operator or laboratory needs.
Refer also to the alarms and corrective actions chart in the Service section
of this manual.
Overtemp Shutdown alerts the operator that the overtemp setpoint has
been exceeded by a few tenths of a degree.
The Overtemp Shutdown message displays and the heaters are turned off,
but the platform and the blowers continue to operate.
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, press
the Silence button to clear the alarm message.
Cycle Complete alerts the operator that the end of the count-down
running time has been reached.
The Cycle Complete message shown displays and the shaker stops.
Press the Silence button to clear the message from the display screen.
2-6 Orbital Shaker Thermo Scientific
Section 2
Operation
The Shaker Alarms
(cont.)
Overtemp Shutdown
Cycle Complete