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Operating and service manual 976 Internal sup HI Warning Description Cause Trouble shooting 12 V supply voltage high on SMC6 Indication of controller internal voltage reference fault Possible causes: • Defective 12 V power supply. • Defective main controller. • Short circuit between 24 V DC and 12 V DC Accompanied alarms: • There may be other alarms, AL 971 and AL 973 • AL 801 will be activated during FT- or PTI test. Trouble shooting: 1) See trouble shooting for AL 974 Criteria Controller action Internal power supply above 14 V DC None Log X Alarm Alarm light Off Consequence Less accurate readings from measurements and risk for damage to sensors 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 Active/Inactive Low limit Parm 3 Parm 4 High limit Actual value A/D channel 980 Tinternal LO Description Cause Trouble shooting Controller Internal Voltage Reference Fault Parm 5 Warning Indication of controller internal voltage reference fault Possible causes: • Defective power supply for main controller. • Defective main controller. Accompanied alarms: • 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) The main controller is defective. Replace the main controller. Criteria Controller action Internal temperature sensor below -40°C (-40°F) None Log X Alarm Alarm light Parm 1 Parm 2 Parm 3 Parm 4 High limit Actual value A/D channel Off Consequence Elimination Log data Active/Inactive Low limit Parm 5 The measured temperature is internal on the main controller and cannot be measured 180 of 227 pages
