VD (E2.1) 10/2011 page 52/83
11. Performance in case of failures
11.1 Performance after power failure
Power failure during fixed-value operation (Normal Display):
The entered parameters remain saved. After power returns operation continues with the set parameters.
Power failure during program operation:
After the power returns, program course continues with the set-points that have been reached previously
during program operation.
11.2 Alarm messages
Alarm messages, e g. “RANGE ERROR CH1” in case of sensor rupture, are shown in Display 2 only in
Normal Display.
A buzzer can be activated / deactivated in the user level (chap. 10). It can be reset by pressing the EXIT
button. The alarm text shown in Normal Display goes off only if the cause of the alarm does not exist any
longer.
12. Safety device class 2 (DIN 12880)
The safety device protects the vacuum drying oven, its environment and the charging material from
exceeding the maximum permissible temperature.
Please observe the guideline BGI/GUV-I 850-0 on safe working in laboratories (formerly BGR/GUV-R
120 or ZH 1/119 laboratory guidelines issued by the employers’ liability insurance association) (for
Germany).
In the event of a fault in the temperature controller, the safety device (2) permanently turns off the
vacuum drying oven. This status is reported visually by the indicator lamp (2a).
Check the operation of the safety device (2) by moving it slowly counter-clockwise until it is turned off.
The safety device cut-off is reported visually by the indicator lamp (2a).
Then release the safety device by pressing the reset button (2b), and turn on the VD vacuum drying oven
as described previously.
Figure 11: Temperature safety device class 2
Function:
The safety device is functionally and electrically independent of the temperature control device and turns
off the unit at all poles.
If you turn the control knob (2) to its end-stop (position 10), the safety device will protect the appliance. If
you set it to a temperature a little above the set-point temperature, it will protect the charging material.
(2)
(2a)
(2b)
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