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Download 810900B_March_Operating and service manual.indd
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Item No. 810900B Operating and service manual 969 AirEx sens sup LO Warning Description Cause Trouble shooting Controller Internal Voltage Reference Fault Indication of controller internal voltage reference fault 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. for more than 3 sec. 2) Access the “special menu” by pressing 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 and 5.05V DC. 3) While displaying “U AirEx“, remove the connector at AirEx potentiometer. − If “U AirEx“ is now inside the correct above range (4.80 – 5.05V DC), the AirEx potentiometer is defect. 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. Criteria Controller action − 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. Reference voltage AirEx below 4.80V DC None Log X Alarm Alarm light Parm 1 Parm 2 Parm 3 Parm 4 High limit Actual value A/D channel Consequence Elimination Log data Active/Inactive Low limit Parm 5 The measured voltage is internal on the controller PCB and cannot easily be measured 182 of 221 pages Off
