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

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Infrastructure & Cities Sector

6.4 Control sequence in the event of fault

If lockout occurs, the outputs for the fuel valves, the burner motor and the ignition
equipment are 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 lockout, the LME7... remains locked and the red fault signal lamp lights
up. The burner control can immediately be reset. This state is also maintained in the
event of mains failure.

6.5 Resetting the burner control

When lockout occurs, the burner control can immediately be 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
Lockout
Start prevention, lockout after approx.
30 seconds at the latest
Lockout end of safety time
Factory setting:
Lockout
Can be parameterized:
(Depending on program module, e.g.
PME73.8...)
1 x repetition
Start prevention, lockout after 30 seconds
Lockout at the end of the specified time
breakdown time
Lockout, with
Lockout, approx. 5 seconds after
temperature thermostat or pressurestat or
temperature or pressure switch on
Shutdown and start prevention
≥0.3 seconds
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CC1P7105en
29.11.2011