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DESCRIPTION
The PPC 5000 is an electronic fuel/air ratio controller employing techniques of parallel positioning
for industrial burners firing gaseous and/or liquid fuels.
The basic unit controls four servo motors, positioning them to within 0.1 of an angular degree. Seven
programmable profiles are available where each profile determines the positional relationship
between all servo motors across the firing range of the burner. The unit has the capability to increase
the number of motor drives from four to eight. These servo motors can operate fuel butterfly or
metering valves and air dampers.
Variable speed interfaces are available to control, the burner fan motor speed and water feed pumps.
Controlling the fuel/air ratio by adjustment of fan speed saves electrical energy and reduces noise.
When the motor speed is halved an 80% electrical energy saving can be realized. Up to four variable
speed interfaces can be added to a single PPC 5000.
Oxygen trim control is another valuable option to achieve maximum efficiency and fuel savings. Fir-
eye’s zirconia oxygen probe has earned an international reputation for reliability and longevity. Oxy-
gen trim automatically and continuously compensates for all the variables that affect efficient
combustion. This option will give typical fuel savings of 2% and will ensure safe and efficient com-
bustion when firing fuels with varying calorific value.
Optional simultaneous firing software has been developed by Fireye which employs novel, dynamic
setpoint technology. It ensures that the correct fuel/air ratio is maintained across the firing range
when two fuels are being fired simultaneously and the ratio of one fuel to the other is maintained
correctly. A single 4 to 20mA signal varies the mix of the two fuels being fired. Oxygen trim is
needed for all simultaneous firing applications. Fuels or fuel combinations with differing and/or
varying calorific values can be accommodated. Switching between various fuel combinations
becomes a routine task.
“ComFire” communications software is an option available for the PPC 5000 electronic fuel/air ratio
controller. This powerful package gives connection to a local or remote personal computer via an
RS485 connection. Information such as setpoints, profiles and engineer’s data is displayed in tabular
and graphic form. A dynamic plant mimic shows the status of all burners on the site provided that
they have PPC 5000 controls. Burner utilization curves can be displayed as chart recorder images
and alarms with time and date stamp are also shown. “ComFire” provides non-safety critical ana-
logue and digital control of the burner from the PC. It is possible to select “burner on”, “trim on”,
“release to ignite”, “release to modulate”, “enable boiler sequencing”, lead boiler for sequencing
control and boiler setpoint. Modulation rate, boiler control setpoints and limits can also be varied
from the PC.
Sequencing software for up 10 boilers is also available allowing the operator to select any boiler as
the lead boiler. As the demand increases the burners progressively move to “high fire” leaving the
last two boilers brought “online” to “modulate”.
As the demand decreases boilers progressively move from “high fire to “modulating” and then from
“modulating to “off-line”. Three pass code levels ensure that unauthorized personnel cannot service
the burners nor change commissioning data. The unit has extensive self diagnostics with primary and
secondary level fault analysis.
PPC5000
Fuel / Air Ratio
Controller
PPC-5000
APRIL 18, 2013
