System Makeup / Function Description - Siemens LME71 Series Basic Documentation

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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.
Basic Documentation LME7...
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CC1P7105enr
24.07.2020