Siemens LME71 Series

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Smart Infrastructure Basic Documentation LME7... CC1P7105enr
2 System makeup / function description 24.07.2020
2 System makeup / function description
The LME7 is a microprocessor-based burner control with matching system components
for controlling and supervision of forced draft burners of medium to large capacity.
LME7 are used for the startup and supervision of 1- or 2-stage forced draft burners in
intermittent operation. The flame is supervised with an ionization probe, optionally with
flame detector QRA2, QRA4 or QRA10.
 Applications in accordance with EN 267: Gas burners for liquid fuels
 Applications in accordance with EN 676: Automatic forced draft burners for
gaseous fuels
 Applications in accordance with EN 746-2: Industrial thermoprocessing equipment -
Part 2: Safety requirements for combustion and fuel handling systems
 Type-tested and approved in accordance with DIN EN 298
The following items are integrated into the LME7:
 Burner control
 BCI for connection a display or PC
 Only LME72 / LME73: Control for one actuator
 Lockout reset button (info button)
 3 multicolor signal lamp LED for operations and fault notifications
 Optional: Analog inputs for load controller DC 0...10 V, DC 0/4...20 mA, 0...135 Ω
 3 x 7-segment display for service, fault and operating state information
 Interface for PME7
Figure 2: Example: Modulating gas burner
The diagram shows the maximum functionality of the LME7. The actual functions are to
be determined based on the respective execution or configuration.