Control Sequence In The Event Of Fault; Resetting The Burner Control - Siemens LME7 Series Manual

Building Technologies

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
Mains voltage failure
Voltage below undervoltage threshold
Voltage above undervoltage threshold
Extraneous light before safety time
Extraneous light during waiting time
No flame at the end of safety time
Loss of flame during operation
Air pressure switch has welded in the
operating position
Air pressure switch has welded in the no-
load position
No air pressure signal on completion of
the specified time
POC contact is open during startup
Pressure switch-min: Failure during
operation
In the event of a non-alterable lockout, the LME7 remains locked and the red fault signal
lamp (LED) lights up permanently.
The burner control can immediately be reset. This state is also maintained in the event of
mains failure.

6.5 Resetting the burner control

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.
Basic Documentation LME7...
6 Function
Response
Restart
Safety shutdown
Restart
Non-alterable lockout
Start prevention, after approx. 30 seconds
of a non-alterable lockout
Non-alterable lockout at the end of the
safety time
Depending on program module, see User
Documentations.
Non-alterable lockout or 1 x repetition
Start prevention, after a maximum of 30
seconds of a non-alterable lockout
Non-alterable lockout at the end of the
specified time
Non-alterable lockout, with down time ≥0.3
seconds
Non-alterable lockout, approx. 5 seconds
after control thermostat or pressurestat ON
or pressure switch ON
Shutdown and start prevention
36/106
CC1P7105enr
17.04.2018