Siemens LMV5 Series Basic Documentation

57/278
Siemens Building Technologies Basic Documentation LMV51... CC1P7550en
HVAC Products 5 Fuel / air ratio control (FARC) 01.10.2003
5 Fuel / air ratio control (FARC)
5.1 General
The electronic fuel / air ratio control system LMV51... can control up to 4 actuators, the
LMV52... up to 6 actuators. The functions of the dampers are ready assigned to the
addresses and are defined as follows:
LMV51... LMV52...
1 Air damper Air damper ²)
2 Fuel 1 (gas) Fuel 1 (gas)
3 Fuel 2 (oil) Fuel 2 (oil)
4
Auxiliary actuator 1 (mixing device)
¹)
Auxiliary actuator 1 (mixing device)
²)
5
Auxiliary actuator 2
²)
6
Auxiliary actuator 3 (FGR)
²)
7
VSD
²)
¹)
VSD (LMV51.2...)
²)
Actuators used in connection with air control (can be parameterized)
Actuators 1...6 are controlled with a resolution of 0.1°. They can be adjusted between
0° and 90°. The VSD is controlled with a resolution of 0.1 %. It can be adjusted
between 0 % (off, prepurge / postpurge fan speed) or 10 % (ignition and operating
speeds) and 100 %.
5.1.1 Program sequence
The program phases are controlled by the burner control. They advance in tune with
the fuel / air ratio control system.
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.
Parameters: LMV51... LMV52...
HomePosAir x x
HomePosGas x x
HomePosOil x x
HomePosAux x x
Aux2 x
Aux3 x
VSD x
In Phase 24, the actuators used for the control of air (air actuator and auxiliary actuator)
are driven to their postpurge positions. If the actuator does not reach the required
position within the maximum time, safety shutdown will take place → 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.
Parameters: LMV51... LMV52...
PrepurgePosAir x x
PrepurgePosAux x x
Aux2 x
Aux3 x
VSD x
Standby
Preventilation

Siemens LMV5 Series Specifications

General

Brand	Siemens
Model	LMV5 Series
Category	Control Systems
Language	English