Siemens LME71 Series

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Smart Infrastructure Basic Documentation LME7... CC1P7105enr
6 Function 24.07.2020
6.4 Control sequence in the event of fault
If a non-alterable lockout occurs, the outputs for the fuel valves, the burner motor and the
ignition equipment are always immediately deactivated (<1 second).
Cause Response
Mains voltage failure Restart
Voltage below undervoltage threshold Safety shutdown
Voltage above undervoltage threshold Restart
Extraneous light before safety time Non-alterable lockout
Extraneous light during waiting time Start prevention, after approx. 30 seconds
of a non-alterable lockout
No flame at the end of safety time Non-alterable lockout at the end of the
safety time
Loss of flame during operation Depending on the PME7, refer to User
Documentation A7105.x.
Non-volatile lockout or 1 x restart
Air pressure switch has welded in the
operating position
Start prevention, after a maximum of 30
seconds of a non-alterable lockout
Air pressure switch has welded in the no-
load position
Non-alterable lockout at the end of the
specified time
No air pressure signal on completion of
the specified time
Non-alterable lockout, with down time ≥0.3
seconds
POC contact is open during startup Non-alterable lockout, approx. 5 seconds
after control thermostat or pressurestat ON
or pressure switch ON
Pressure switch-min: Failure during
operation
Shutdown and start prevention
In the event of a non-volatile lockout, the LME7 remains locked and the signal lamp (LED)
lights up red permanently. The LME7 can then be reset immediately. This state is also
maintained in the event of mains voltage interruptions.
6.5 Resetting the LME7
After a non-alterable lockout, the burner control can be immediately reset.
To do this, press the lockout reset button (info button) for about 1 second (<3 seconds).
The LME7 can only be reset when all contacts in the line are closed and when there is
no undervoltage.