VDH Products BV
Document 951573 - Version 1.3
Blad: 15 of 26
2.4
Alarms and warnings of the PROBA 50
Alarms and warnings are adjustable within the following parameters:
Description
Min.
Max.
Absolute Maximum Temperature Alarm
-10.0°C
+40.0°C
Absolute Minimum Temperature Alarm
-10.0°C
+40.0°C
Delay Relative Temperature Warning
0 min
99 min
Relative Maximum Temperature Warning
0.0°C
+40.0°C
Relative Minimum Temperature Warning
-40.0°C
0.0°C
Maximum Air Temperature
-10.0°C
+40.0°C
Minimum Air Temperature
-10.0°C
+40.0°C
All active temperature sensors are continuously checked for exceeding the absolute temperature limits. If that
happens, a Fatal Alarm will follow.
There are also relative temperature limits. These are linked to the current temperature setpoint. If the setpoint
changes, these limits change by the same amount. These alarms can be delayed.
Example: Temperature setpoint = 16.0°C; Relative Maximum Alarm = +4.0°C; The limit of the Relative Maximum
Alarm is at 20.0°C. As soon as one of the sensors goes above 20.0°C, a delay timer is started. If the temperature
remains higher than 20.0°C during the set time, a Non Fatal Alarm is triggered.
If sensor 4, the air temperature alarm sensor, is connected and measures a temperature which is above the
Maximum Air Temperature Alarm, the heating relay is blocked and released again if the air temperature is below the
Maximum Alarm level. If the air temperature is below the Minimum Air Temperature Alarm, the cooling relay is
blocked. It is released if the temperature has risen above the Minimum Alarm level.
Changing these parameters is described earlier.
Standard values which are set at the factory are:
Setting
Value
Absolute Maximum Temperature
+22.0°C
Absolute Minimum Temperature
+10.0°C
Delay Relative Temperature Alarm
30 min
Limit Relative Maximum Temperature
+4.0°C
Limit Relative Minimum Temperature
-4.0°C
Maximum Air Temperature
+20.0°C
Minimum Air Temperature
+10.0°C
Differential Air Temperature Limitation
0.5°C
