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VD (E3.1) 10/2020 page 91/179
11.2.3 Message and measures in the state of alarm
11.2.3.1 RD4 controller
The state of alarm is indicated visually in Normal display. If the buzzer is enabled (chap. 13.4.1) there is
an additional audible alert. The heating turns off. As soon as the inner chamber temperature has cooled
down below the safety controller value, the heating can be is released. Only then the temperature control
continues.
In Normal display a text message indicates the alarm cause. The “collective alarm” icon flashes. If the
audible arm is activated, the buzzer sounds. Press the OK button to mute the buzzer.
The alarm message “Safety controller” and the “Collective alarm” icon are displayed on the controller until
you press the OK button on the controller and the inner chamber temperature has cooled down below
the safety controller value.
• If the inner chamber temperature has already cooled down below the safety controller value when
pressing the OK button, the alarm message “Safety controller” and the “Collective alarm” icon are
reset together with the buzzer.
• If the state of alarm is still active when pressing the OK button, i.e. the inner chamber temperature is
still above the safety controller value, first only the buzzer is reset. The alarm message “Safety
controller” and the “Collective alarm” icon will disappear as soon as the inner chamber temperature
falls below the safety controller value.
• The alarm remains active until it is acknowledged on the controller and the inner temperature falls
below the entered safety controller setpoint. Then the heating is released again.
Normal display showing safety controller alarm (sample values)
Safety controller
Note: When the safety controller class 2 had been activated you should disconnect the chamber from the
power supply and have an expert examine and rectify the cause of the fault.
11.2.3.2 MB2 controller
The state of alarm is indicated visually and additionally with an audible alert if the buzzer is enabled
(chap. 13.4).
The alarm remains active until it is acknowledged on the controller and the inner temperature falls below
the set safety controller setpoint. Then the heating is released again.
Normal display with safety controller alarm.
Press the Alarm icon
List of active alarms.
Press the Reset alarm icon.
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