Control Sequence In The Event Of Fault; Resetting The Burner Control; Limitation Of Repetitions (Can Be Parameterized) (Depending On Parameter P240) - Siemens LME7 Series Basic Documentation

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6.4 Control sequence in the event of fault

If lockout occurs, the outputs for the fuel valves, the burner motor and the ignition equip-
ment immediately deactivated (<1 second).
Cause
Mains voltage failure
Voltage below undervoltage threshold
Voltage above undervoltage threshold
Extraneous light before safety time (TSA)
Extraneous light during waiting time (tw)
No flame at the end of safety time (TSA)
Loss of flame during operation
Air pressure switch (LP) has welded in the
operating position
Air pressure switch (LP) has welded in the
no-load position
No air pressure signal after completion
specified time (t10)
POC contact is open during startup
In the event of lockout, the LME7... remains locked and the red fault signal lamp (LED)
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 undervolt-
age.
6.6 Limitation of repetitions (can be parameter-
ized)
(depending on parameter P240)
If the flame is lost during operation, a maximum of 1 repetition per controlled startup
can be performed via temperature thermostat or pressurestat (R), or else lockout will be
initiated.
Basic Documentation LME7...
6 Function
Response
Restart
Safety shutdown
Restart
Lockout
Prevention of startup, lockout after approx.
30 seconds at the latest
Lockout end of safety time (TSA)
Factory setting:
Lockout
Can be parameterized:
(Depending on program module e.g.
PME73.8...)
1 x repetition
Prevention of startup, lockout after 30 sec-
onds
Lockout end of specified time (t10)
breakdown time
Lockout, with
Lockout, approx. 5 seconds after tempera-
ture thermostat or pressurestat (R) or tem-
perature or pressure switch (W) on
≥0,3 seconds
28/164
CC1P7105en
13.10.2009