ABB Uvisor SF910i User Manual page 88

11 Configuration Parameters in Flame Explorer
A standard kit with orifices of different diameter, including the retainer and gasket is
available, Article number: TU_KIT01.
To choose the best size of the orifice, assure the maximum level of intensity do not
exceed 85% with associated burner in operation at maximum load and remain at decent
level, preferably above 40% when the associated burner is operating at the minimum
rate.
Detecting Flicker-Frequency Noise
SF910i has a precision A/D converter that can measure very small Flicker-Frequency
levels in the flame scanner input signal.
If electrical noise exists in the Flame Scanner wiring, the SF910i may detect the electrical
noise if the Flicker-Frequency sensitivity is set too low.
During initial Flame Scanner tuning, the system must be checked to ensure that no
electrical noise is present.
Check for Electrical Noise
– Darken the Flame Scanner by making sure that it is not exposed to any flame or
ambient light.
– Set the Flicker-Frequency sensitivity to the minimum value expected for the
application.
– Select frequency as the value to be shown on the display.
Flicker-Frequency displayed must be 0 Hz. If it is not 0 Hz, the minimum Flicker-Frequency
sensitivity must be raised or the electrical wiring inspected for proper shielding and
installation.
Smoothing
Smoothing filters are algorithms to smooth variations in the Measured-Value values.
Smoothing provides more consistent signals for analysis. This allows for more sensitive
trip points without causing unnecessary Flame-Off conditions.
There are 11 stages of smoothing available for Measured-Values.
Smoothing function values can be set from NONE to 10.
– A value of NONE disables smoothing filters.
– Disabling smoothing will maximize the speed of flame detection.
– A value of 1 provides the minimum amount of smoothing.
– A value of 10 provides the maximum amount of smoothing.
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