...
. . . . .
'l'I'ul'
.
ii
II
ii
AALBORG
INDUSTRIES
3
Language
UK
OIL/AIR REGULATION OM5560_95#A.2
The output signal from the potentiometer is a voltage signal, which is converted into
a resistance signal in the control system. On the local panel the resistance signal is
displayed in the menu setup/calibrate/servo motor/raw data. When the position
of
the
servomotor is set to 0
0
,
which can be seen on the outer scale, the raw data line displays
a numerical value. This value must be entered in low range menu line.
After calibration
of
the low range position, the servomotor should be set to 90°. The
new numerical value, which
is
displayed in the raw data line, should be entered as the
high range. In this way the operation range
of
the servomotor is calibrated for an op-
erating range between
0°
and 90° corresponding to 0-100%.
The position
of
the servomotor will be handled and displayed as a percentage value in
all other menus.
Furthermore, the time to operate the servomotor from
0°
to 90° and the accepted re-
sponse threshold can be set on the local control panel.
2.2 Pre-adjustment
of
the servomotor settings
The following servomotor positions for operation should be set as preliminary settings
on the local control panel in the menu setup/settings:
• Stand-by position (burner stopped) 0% (0°)
• Ignition position 22% (20°)
• Minimum firing position 33% (30
0
)
• Purge and full load position 67% (60°)
Please consider the proposed settings
as
guidelines only
as
the final settings should be
performed after measuring the flue gas
(C02/02 content).
Oil regulator
The oil regulator is driven by the servomotor
in
a'continuous movement from partial
load to full load, thus regulating the return oil flow from the nozzle head. Figure 3
illustrates the oil regulator.
It
is provided with indicator and scale.
• Indicator
in
position I: dosing shaft open, The return flow is at maximum and the
return pressure at minimum.
• Indicator
in
position
13:
dosing shaft closed. The return flow
is
at minimum and
the return pressure at maximum.
There
is
a number on the dosing shaft and on the indicator which shows the size
of
the
groove on the shaft.
21-21/60
To Next Page
Loading...