Electronic Air-Fuel Ratio Control; General; Behavior Outside The Operating Positions; Traveling Speed - Siemens LMV27.100x2 Basic Documentation

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10

Electronic air-fuel ratio control

10.1

General

Electronic air-fuel ratio control is used to control the burner's actuators depending on
burner output. It is possible to connect 2 actuators.
Resolution is 0.1° with the actuators. Output can be regulated in increments of 0.1% in
modulating mode and with a maximum of 3 stages in multistage mode.
To reduce the electric power required for the actuators, they are never operated
simultaneously, but in successive order, or alternately.

10.2 Behavior outside the operating positions

Outside their operating positions, the actuators approach the different positions in
successive order.
The program phase determines the position to be approached.

10.2.1 Traveling speed

The running speed of the actuators is fixed at 5 seconds for a positioning angle of 90°
for SQM33.4, SQM33.5, and SQN1.
The speed is 10 seconds for a positioning angle of 90° for SQM33.6.
The SQM33.7 requires 17 seconds for a positioning angle of 90°.
The setting also applies to the running position (refer to chapter Running position).
10.2.2

Home position

This position is approached in the Home run (10), Standby (12) and Lockout position
(00) phases.
The position can be set via the following parameters:
Parameter Actuator
501.00 Home position fuel actuator
502.00 Home position air actuator
10.2.3

Prepurging

This position is approached in phase Traveling to prepurging (24).
The position can be set via the following parameters:
Parameter Actuator
501.01 Prepurge position fuel actuator
502.01 Prepurge position air actuator
No. Parameter
Gas: Prepurging
222 0 = inactive
1 = active
Oil: Prepurging
262 0 = inactive
1 = active
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17.12.2018