VDL (E3) 09/2019 Page 150/234
Normal display in state of alarm (example).
(a) Screen header flashing in red color and
showing the alarm message
(b) Alarm icon on the bottom of the screen:
change to the list of active alarms and alarm
acknowledgement
16.2.2 RD4 controller
In the event of equipment failures, when the temperature and / or pressure deviate 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. 15.2.1,
15.2.2), 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 “coll-
ective alarm” icon is lit.
Alarm indication (example: safety controller alarm)
Alarm messages overview:
Condition Alarm message
Start after
condition occurred
Tolerance range alarm: actual tem-
perature value exceeding the tole-
rance range)
“Temperature range alarm”
after configurable time
(chap. 15.2.1)
Factory setting: 10 minutes
Tolerance range alarm: actual pres-
sure value exceeding the tolerance
range)
“Pressure range alarm”
after configurable time
(chap. 15.2.2)
Factory setting: 10 minutes
Exceeded setpoint of the safety con-
troller class 2
“Safety controller” immediately
Overtemperature protective device
class 2 (thermal switch) activated
“Overtemperature” immediately
Safety temperature limiter (TL) has
turend off the heater
“Overtemperature” immediately
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