FCU 500, FCU 505 · Edition 02.17
8
Application
1 .1 Application examples
1 .1 .1 ON/OFF rotary impulse control
For processes which require a turn-
down of more than 10:1 and/or
those which require heavy circula-
tion of the furnace atmosphere to
ensure a uniform temperature, e.g.
heat treatment furnaces operating
at low and medium temperatures in
the metallurgical industry.
With ON/OFF cyclic control, the
capacity supplied to the process is
controlled by means of a variable
ratio of the operating time to the
pause time. In this type of control,
the burner output pulse frequency
always maintains full momentum
and results in maximum convection
in the furnace chamber, even with
regulated heating.
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.
▼
M
PZL
PZH
PZ
PZL
PDZ
TE
M
BCU 460..L
BCU 460..L
FCU 500..F0
µC
P
DG
DG
DG
VAS
VAS
VAS
VCG
VCG
VR..L
VR..L
DG
DG
DG
min
DG
max
49
15
13
14
50
45
47 48
58
>750°
p
u
/2
ϑ
1
46
2
3
DL
min
DL
Purge
STM