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Building Technologies Basic Documentation LMV5... CC1P7550en
6 Fuel-air ratio control (FARC) 22.05.2018
6.4 Control sequence
The program phases are controlled by the burner control. They advance in tune with
the fuel-air ratio control system.
6.4.1 Idle position
In standby, the actuators are driven to their home positions. A deviation from the
required position does not lead to lockout, but only to start prevention. The home
position is defined for all actuators and can be adjusted differently for oil and gas.
Parameter: LMV51 LMV50
LMV51.3
LMV52
HomePosAir
˜ ˜ ˜
HomePosGas
˜ ˜ ˜
HomePosOil
˜ ˜ ˜
HomePosAux
˜ ˜ ˜
HomePosAux2
˜
HomePosAux3
˜ ˜
HomePosVSD
˜ ˜
6.4.2 Prepurge positions
In phase 24, the actuators used for the control of air (air actuator and auxiliary actuator)
are driven to their prepurge positions. If the actuator does not reach the required
position within the maximum time, safety shutdown is initiated ↑ position check. The
prepurge time starts only when the actuators have reached their prepurge positions.
The prepurge position is only defined for the actuators used for the control of air and
can be parameterized depending on the type of fuel. The fuel actuators maintain their
home positions.
Parameter: LMV51 LMV50
LMV51.3
LMV52
PrepurgePosAir
˜ ˜ ˜
PrepurgePosAux1
˜ ˜ ˜
PrepurgePosAux2
˜
PrepurgePosAux3
˜ ˜
PrepurgePosVSD
˜ ˜
6.4.3 Ignition positions
In phase 36, all actuators are driven to their ignition positions. For that purpose – like in
prepurging – a maximum time is available within which the ignition position must be
reached ↑ position check.
Ignition takes place only when the required position is reached. The ignition position
can be adjusted for all actuators, depending on the type of fuel.
Parameter: LMV51 LMV50
LMV51.3
LMV52
IgnitionPosAir
˜ ˜ ˜
IgnitionPosGas
˜ ˜ ˜
IgnitionPosOil
˜ ˜ ˜
IgnitionPosAux1
˜ ˜ ˜
IgnitionPosAux2
˜
IgnitionPosAux3
˜ ˜
IgnitionPosVSD
˜ ˜
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