BCU 580 · Edition 11.15l 17
Application
1.1.8 Modulating burner control
For processes that do not require
heavy circulation in the furnace, e.g.
aluminium smelting furnaces.
This system is suitable for process-
es in which infiltrated air may flow
into the furnace through switched
off burners. The capacity can be
adjusted continuously by activating
the air control valve (analogue or
3-point step signal).
The pneumatic ratio control sys-
tem controls the gas pressure on
the burner proportionally to the air
pressure and thus maintains a con-
stant air/gas ratio. At the same time,
it acts as a low air pressure protec-
tion device.
The ignition and monitoring of the
pilot/main burners is ensured by
burner control units BCU 580.
The centrally checked safety func-
tions such as pre-purge, tightness
test, flow detector and pressure
switch check (gas
min.
, gas
max.
,
air
min.
) are provided by the FCU 500.
M
PZL PZH PZ
PZL PDZ
TE
BCU 580..F3
DG DG DG
VAS
VAS
VAS
VAGVAS
VAS
VR..L
VR..L
DG DG
DG
min
DG
max
p
u
/2
DL
min
DL
Purge
BCU 580..F3
VAGVAS
VAS
M
FCU 500..F1
µC
P
49 15 131450
53
45
47 4858
M
TC
90°➔0°
0°➔90°
54
55
>750°
ϑ
1
2
3
46
STM
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