PFU 780 · Edition 02.12
4
Module subrack
BGT for instance
serves to accom-
modate several
function units. It
is provided with
a backplane with
screw terminals
for simple, reliable
wiring.
1 Application
The burner control units PFU 780 control, ignite and monitor
gas burners for intermittent or continuous operation. As a
result of their fully electronic design they react quickly to vari-
ous process requirements and are therefore also suitable for
frequent cycling operation.
The PFU 780 can be used for industrial burners of unlimited
capacity which are ignited by pilot burners. Pilot and main
burners are controlled and monitored independently. This
reduces the main burner start-up time. The pilot burner can
burn permanently or be switched off. The main burners may
be modulating or stage-controlled.
On industrial furnaces, the PFU 780 reduces the load on the
central furnace control by taking over tasks that only relate
to the burner, for example it ensures that the burner always
ignites in a safe condition after it has been restarted.
The burner control unit is used for burners with mechanical
combustion air supply where the fan is controlled by a separate
logic and for atmospheric burners.
The air valve control on the PFU 780L assists the furnace control
for cooling, purging and capacity control tasks.
The program status, the unit parameters and the level of the
flame signal can be read directly from the unit. Pilot and main
burners can be controlled manually for commissioning and
diagnostic purposes.
If the local requirements on the burner control units change,
the PC software BCSoft can be adjusted to the unit parameters
of the application by using the optical interface.
To support service personnel, BCSoft offers a convenient visu-
alisation system of the input and output signals and the error
history.