DURAG D-LX 200, Manual

Page: 62 / 116

Adjusting the Flame Monitor
As far as possible, make the settings on the flame monitor so that the monitor
indicates 0 or 4 mA for Flame OFF and 20 mA for Flame ON.
The flame monitor must prevent simulation of a flame in all operating states
and under the most diverse combustion conditions.
With optimal adjustment of the viewing position, the gain characteristic curve
and the thresholds of the flame monitor, the D
− LX 200, D − LX 720 must always
reliably indicate a switched-off burner or an unacceptable deterioration in the
flame pattern. The influence of background radiation sources must not be
allowed to generate a defective system state.
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D − LX 200, D − LX 720
If, after setting the flame monitor to be insensitive to background radiation, the
monitor can no longer detect its own flame, the difference between
background radiation and useful light (flame to be monitored) is too small. In
this case, it is advisable to switch the gain characteristic curve one "gain
characteristic curve higher" with the MODE (DIP) switches. The steeper
characteristic curve enables a greater signal difference between background
radiation and useful light.
If Range A and Range B are used, the settings for each range must be made
separately!
Please also note the information for the Range selection from page 59.
6.5.2 Setting by means of D − LX 200 InformationCentre
Before commencing setting tasks on the Compact Flame Monitor, loosen the
hood using the four Allen screws and carefully remove it backwards.
If the printed circuit boards have become loose after removing the hood, you
must ensure that the terminal strips on the printed circuit boards are not
misaligned when reassembled. This could result in severe damage to the
D
− LX 200, D − LX 720.
In addition, the data communication between the PC and the D − LX 200,
D − LX 720 must be established with a USB/RS485 serial interface converter
(see connection plan Figure 11.1 page 103). The InformationCentre software
visualises and documents the configuration of the D
− LX 200, D − LX 720.
Settings on the Compact Flame Monitor are made manually using the rotary
and (
 ) DIP switches, as previously described. You can find a description of
the InformationCentre in chapter 7 from page 69. After establishing the data
connection InformationCentre must be started.