C 150 (E2) 06/2011
page 43/78
10. Alarm functions
10.1 Alarm functions overview
When operational faults occur, the controller triggers visual and audible alarm signals. The LED “ALARM”
always flashes when an alarm signal is emitted.
A zero-voltage relay alarm output (13) (chap. 10.3) permits transmission of the alarm e.g., to a central
monitoring system.
Display
Event
Safety controller alarm (set value of the safety controller exceeded)
Temperature tolerance range alarm
Door open
CO
2
tolerance range alarm
CO
2
pressure too low
Failure of CO
2
sensor
Failure of temperature sensor for door heating
Failure of temperature sensor for safety controller
Failure of temperature sensor for interior heating
CO
2
sensor not connected
If more than one alarm signal is sent simultaneously, they are displayed in a cycle, except for alarms 995
to 999. These take priority over all other operational displays and alarm signals of the controller.
Except for the tolerance range alarms, all alarms are displayed immediately when the fault occurs. The
tolerance range alarms are suppressed for a selected time (delay times set for temperature alarm and for
CO
2
alarm) after opening the unit door or turning on the C 150.
10.2 Resetting the alarm messages
•
Remove the cause of the alarm or wait until the unit compensates for the reason of the error.
•
The visual alarm disappears, when the cause of the fault has been remedied or the monitored
operating function returns within its tolerance limits.
•
Press the “EXIT” button to turn off the audible alarm signals.
Summary of Contents for APT.line C 150
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