Preconditions For Burner Startup; Undervoltage; Control Sequence In The Event Of Fault; Resetting The Burner Control - Siemens LME11 series Manual

Functions
Preconditions for
burner startup

Undervoltage

Controlled intermittent
operation
Reversed polarity
protection with
ionization
Control sequence in the
event of fault
Resetting the burner
control
Limitation of repetitions
(only LME11...)
Building Technologies
HVAC Products
•
Burner control must be reset
•
All contacts in the line are closed, request for heat
•
No undervoltage
•
Air pressure switch «LP» must be in its no-load position or CPI or wire link 2
•
Fan motor or AGK25 is closed
•
Flame detector is darkened and there is no extraneous light
•
Safety shutdown from the operating position takes place should mains voltage drop
below about AC 175 V (at U
•
Restart is initiated when mains voltage exceeds about AC 185 V (at U
After no more than 24 hours of continuous operation, the burner control will initiate
automatic controlled shutdown followed by a restart.
If the connections of live conductor (terminal 12) and neutral conductor (terminal 2) are
mixed up, the burner control will initiate lockout at the end of «TSA».
If lockout occurs, the outputs for the fuel valves, the burner motor and the ignition
equipment will immediately be deactivated (< 1 second).
Cause
Mains failure
Voltage below undervoltage threshold
Voltage above undervoltage threshold
Extraneous light during «t1»
Extraneous light during «tw»
No flame at the end of «TSA»
Loss of flame during operation
«LP» is welded in working position
«LP» is welded in normal position
No air pressure signal after completion «t10» Lockout
«CPI» contact is open during «tw»
In the event of lockout, the LME... remains locked and the red signal lamp (LED) will light
up. The burner control can immediately be reset. This state is also maintained in the case
of mains failure.
When lockout occurs, the burner control can immediately be reset. To do this, press the
lockout reset button for about 1 second (< 3 seconds). The LME... can only be reset
when all contacts in the line are closed and when there is no undervoltage.
If no flame is established at the end of «TSA», or if the flame is lost during operation, a
maximum of 3 repetitions per controlled startup can be performed via «R», or else
lockout will be initiated. Counting of repetitions is restarted each time a controlled star-
tup via «R» takes place.
= AC 230 V)
N
Response
Restart
Safety shutdown
Restart
Lockout
Prevention of startup, lockout after 30 sec-
onds at the latest
LME11...:
Max. 3 repetitions, followed by lockout at the
end of «TSA»
LME2...:
Lockout at the end of «TSA»
LME11...:
•
Establishment of flame at the end of
«TSA» → Max. 3 repetitions
•
No establishment of flame at the end of
«TSA» → Lockout
LME2...:
Lockout
Prevention of startup, lockout after 65 sec-
onds at the latest
Lockout on completion of «t10»
Prevention of startup, lockout after 60 sec-
onds at the latest
= AC 230 V)
N
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CC1N7101en
29.06.2006