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372001-24 Rev. A
IDDX Flame Detector Amplifier Manual
Self-Check Cycle Time for Modes 1
The next screen shows the self-check cycle time being used. This value is displayed and entered in
seconds. For example, two minutes is entered as 120 seconds. The self-check cycle time is restricted to
a minimum value of 30 seconds and a maximum value of 600 seconds (10 minutes).
Regardless of the number of channels being used, both channels must be set to an equal Self-
Check Cycle Time. If different self-check cycle times are set, the shorter of the two settings will be
effective on both Channels.
During self-check the detectors are blinded for a brief interval. After a short delay, the signal levels are
compared and self-check failure occurs if a detector’s output is above its dropout point. The Blind function
for an IDD detector head has the 50Vdc bias Voltage removed.
Example set SELF CHECK Delay to 5 minutes.
F1 - CHG – type in 300
F4 - OK
F4 – NXT
Note:
Timed self-check is inhibited if there is no flame indication or if the system is being tuned or blinded.
System performs self-check 2 seconds after detection of flame. Any self-check failure will cause
immediate flame failure. The Flame and Lamp LEDs will extinguish, and the Red Alarm LED will light.
The display will show a repeating error message informing the user the flame detector failed.
