181 of 222 pages
Operating and service manual
970
AirEx sens sup HI
Warning
Description
Controller Internal Voltage Reference Fault
Cause
Indication of controller internal voltage reference fault
Trouble
shooting
Possible causes:
•
Defect power supply for controller PCB.
•
Defect controller PCB.
Accompanied alarms:
•
There may be sensor alarms, AL 3XX.
•
AL 801 will be activated during FT- or PTI test.
Trouble shooting:
1) Check if there are other active (sensor) alarms. Clear these alarms first
using their trouble shooting.
2) Check voltage level of 24 V DC and 5 V signals to see if power supply has
an open circuit or other damages. If voltages are ok, the controller PCB is
defect. Replace controller door.
Criteria
Reference voltage AirEx above 5.20 V DC
Controller
action
None
Log
X
Alarm
Alarm light
Off
Consequence
Less accurate readings from measurement
Elimination
Alarm will be marked as inactive in alarm list when supply voltage is correct. Alarm may
then be deleted
Log data
Parm 1
Parm 2
Parm 3
Parm 4
Parm 5
Active/Inactive Low limit High limit
Actual value A/D channel
The measured temperature is internal on the controller PCB and cannot be measured