BFI Automation 3001D, Original Operating Instructions

Page: 42 / 49

Operation of the flame amplifier
6-2
6.3 Initial operation of the flame amplifier
The flame amplifier provides the flame scanner with oper-
ating voltage and the self test pulse, and ensures the
evaluation of the flame scanner signals. All safety-related
functions are carried out by the self-checking flame ampli-
fier. After correct installation and wiring, the system is op-
erational immediately. The respective status indicator
(green LED) lights up at the slide-in power supply unit
(optional, type 3002) and on the flame amplifier. The RM
and RF LEDs as well as the bar graph indicator for the in-
tensity are off.
After correct detection of the flame to be monitored, the
RF and RM LEDs have to be lit. These LEDs have to be
allocated to the "Flame on" and "Flame off" safety circuit.
The safety circuit is connected by means of the pin con-
nectors c28, a28 and c30. The flame intensity is displayed
by a bar-graph display. One bar represents 2.0 mA (0 - 20
mA) or 1.6 mA (4 - 20 mA).
The flame intensity indicator must be in the range be-
tween 50% and 100% !
If the output signal is lower than 50 %, monitoring may
become instable. The flame relay is switched off at 25 %.
By means of the pre-set pre-alarm warning, a warning
signal may be generated at a threshold to be set. An
overoscillation in the range of 20 to 25 mA is permissible.
6.4 Factory setting of the flame amplifier
All sensitivity settings have set to the maximum value
(99). The setting (00) is not permitted.
All safety switch-OFF times have been set to 1 s.
The switch-ON threshold is set to 25% and the pre-alarm
warning to 50%.
The switch-ON delay time corresponds to half the switch-
OFF time (X5, B-C closed, near front panel).
The analogue output has been set to 0 - 20 mA (X4 and
X6 closed).
The impulse dividing ratio has been set to 1:1.