Operating and service manual
180 of 222 pages
969
AirEx sens sup LO
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 sensor pulling power supply down.
•
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) Access the “special menu” by pressing
for more than 3 sec. Scroll down
until you see the label “U AirEx” in the display. The value of “U AirEx“ should
be in the range between 4.80 V DC and 5.05 V DC.
3) While displaying “U AirEx“, remove the connector at AirEx potentiometer.
−
If “U AirEx“ is now inside the correct above range (4.80 – 5.05 V DC),
the AirEx potentiometer is defective. Replace the AirEx potentiometer
−
If “U AirEx” is still outside the above range, proceed to next step.
4) While displaying “U AirEx“, disconnect “AirEx” from the terminals according
to wiring schematics inside in the control cabinet.
−
If “U AirEx” is now inside the above range the cable for “AirEx” is defect.
Mount connector correctly or replace connector cable for “AirEx”.
−
If “U AirEx” is still outside, correct the above range. The controller PCB is
defect. Replace the controller door.
Criteria
Reference voltage AirEx below 4.80 V DC
Controller
action
None
Log
X
Alarm
Alarm light
Off
Consequence
Elimination
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
