Control (Characteristics); Integrated 2-Position Controller (R = On/Off) - Siemens LMV50 Series Manual

Operating mode
General
Switching differentials
Β
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Building Technologies

7.4 Control (characteristics)

The load controller can operate in 2 different operating modes:
∂ Modulating, or
∂ Multistage
With electronic fuel-air ratio control, modulating or multistage mode must be selected,
depending on the type of burner.
Parameter Operation Mode (Two-stage / Three-stage / Modulating)

7.4.1 Integrated 2-position controller (R = ON/OFF)

The integrated 2-position controller transmits to the burner control section the internal
information Heat request controller (R = ON/OFF).
Modulating mode:
R = ON when:
R = OFF when:
Multistage mode:
R = ON when:
R = OFF when:
R = OFF when:
Note!
The following standards also have to be observed for multistage operating mode:
∂
SD_Stage3Off > SD_Stage1On
∂
SD_Stage3Off < SD_Stage2Off < SD_Stage1Off
Ι
Note!
When SD_*_On is positive, the switching differential lies above the setpoint. When
SD_*_On is negative, it lies below the setpoint (load controller software version V01.40
or higher).
Parameter SD_ModOn
SD_ModOff
SD_Stage1On
SD_Stage1Off
SD_Stage2Off
SD_Stage3Off
Basic Documentation LMV5...
7 Boiler controller / load controller
Actual value ' (setpoint ± SD_ModOn)
Actual value > (setpoint + SD_ModOff)
Actual value ' (setpoint ± SD_Stage1On)
Actual value > (setpoint + SD_Stage1Off) or
Actual value > (setpoint + SD_Stage3Off) = low-fire operation;
always applies if none of the 2 thresholds Q2 and Q3 has been
exceeded
CC1P7550en
22.05.2018