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VD (E3.1) 10/2020 page 45/179
5.3.2 MB2 controller
After the power returns, the controller continues to function in the original operating mode it was in
previously before the power failure occurred:
• Performance after power failure in Fixed value operation mode
All functions return to the same status the chamber had before power failure. The set-points are
immediately resumed.
• Performance after power failure during Timer operation
The set-points which had been active at the moment of program start are resumed. Program run
continues.
• Performance after power failure during Time program operation
The program is resumed at the point where the interruption occurred with the latest set-points reached
during the program run.
• Performance after power failure during Week program operation
The week program continues with the values corresponding to the current time.
Power failure and power return are noted in the Event list (chap. 10.2.5).
If during power failure an alarm has occurred (e.g., tolerance range, safety controller), confirm the alarm.
See chap. 13.3.
6. Start up
With regard to operating the vacuum drying oven VD and the vacuum pump, please observe the DGUV
guidelines 213-850 on safe working in laboratories, issued by the employers’ liability insurance
association (for Germany).
Note: Warming chambers may release odors in the first few days after commissioning. This is not a
quality defect. To reduce odors quickly we recommend heating up the chamber to its nominal
temperature for one day and in a well-ventilated location.
6.1 Condition after establishing the power connection
Prior to establishing the power connection, the following points must certainly be met:
• Installation of the chamber (chap. 4) performed in compliance with the installation guidelines and
ambient conditions (cap. 3.4)
• Vacuum supply connected (chap. 4.3)
• If required: Inert gas connection established (chap. 4.5)
Establish the power connection: connect the power plug (chap. 4.6). Connect the power supply only when
needed, and disconnect it when the chamber is not in use for an extended period.
MB2 controller: After establishing power supply the pilot lamp in the instrument panel shows readiness
for operation.
The authorization level is “User”. To be able to use the entire functionality of the controller (e.g., Settings
menu functions, program functions, activating / deactivating Standby mode), log in with the desired
authorization level.
All parameters, set-points and settings remain the same as before turning off.
• If the Standby mode had been activated prior to the power failure, the chamber remains off after the
power returns. To operate it you must sign in with a higher authorization level and deactivate the
standby mode.
• If the Standby mode had been deactivated prior to the power failure, operation continues after the
power returns with previously entered parameters.
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