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VD (E3.1) 10/2020 page 97/179
13.2 Alarm messages
13.2.1 RD4 controller
In the event of equipment failures, when the temperature and / or pressure deviates from the set
tolerance range limits, optical and possibly acoustic alarm messages are given out via the controller.
The alarm messages on leaving the tolerance range are emitted after a configurable delay (chap. 12.1.1,
12.1.2), the others immediately when the fault occurs. The tolerance range alarm is suppressed after
turning on the chamber until the setpoint is reached and then for the selected delay time.
In Normal display a text message indicates the alarm cause. The “collective alarm” icon flashes. If
the audible arm is activated, the buzzer sounds.
If more than one alarm signal is sent simultaneously, they are displayed in a cycle.
Press the OK button to confirm the alarm and mute the buzzer. If the alarm cause is still valid, the
“collective alarm” icon is lit.
Alarm indication (example: safety controller alarm)
(sample values)
Safety controller
Alarm messages overview:
Condition Alarm message
Start after
condition occurred
Tolerance range alarm: actual
temperature value exceeding the
tolerance range)
“Temperature range alarm”
after configurable time
(chap. 12.1.1)
Factory setting: 10 minutes
Tolerance range alarm: actual
pressure value exceeding the
tolerance range)
“Pressure range alarm”
after configurable time
(chap. 12.1.2)
Factory setting: 10 minutes
Exceeded setpoint of the safety
controller class 2
“Safety controller” immediately
Overtemperature protective device
class 2 (thermal switch) activated
“Overtemperature” immediately
Temperature sensor defective.
Actual temperature value
display shows
“ – – – – ”
immediately
Failure of pressure sensor
Actual pressure value display
shows
“ – – – – “
immediately
Failure of temperature sensor for
object temperature (option)
(no value shown) immediately
When operating the chamber without vacuum connection, turn off pressure control (chap. 8.6)
in order to avoid alarms of the pressure system.
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