FCU 500, FCU 505 · Edition 02.17 10
Application
1.1.2 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 system controls the
gas pressure proportionally to the
air pressure and thus maintains a
constant air/gas ratio. At the same
time, it acts as a low air pressure
protection device.
One burner control unit per burner
is required for ignition and monitor-
ing.
The centrally checked safety func-
tions such as pre-purge, setting the
valve to ignition position via a but-
terfly valve control system, tight-
ness test, flow detector and pres-
sure switch check (gas
min.
, gas
max.
,
air
min.
) are provided by the FCU 500.
FCU 500..F1
µC
P
DG DG DG
VAS
VAS
VCG
VCG
DG
min
DG
max
49 15 131450
53
45
47 4858
p
u
/2
M
PZL PZH PZ
PZL PDZ
TE
BCU 460..L
BCU 460..L
M
M
TC
90°➔0°
0°➔90°
54
55
VAS
DGDG
>750°
ϑ
1
2
3
DL
min
DL
Purge
46
STM
To Next Page
