Control Sequence; Idle Position; Prepurge Positions; Ignition Positions - Siemens LMV50 Series Manual

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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:
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:
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:
IgnitionPosAir
IgnitionPosGas
IgnitionPosOil
IgnitionPosAux1
IgnitionPosAux2
IgnitionPosAux3
IgnitionPosVSD
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22.05.2018