O2 Trim Control With Lmv52 And Pll52; General - Siemens LMV50 Series Manual

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Building Technologies

19 O2 trim control with LMV52 and PLL52

19.1 General

The LMV52 is an extended LMV51. A special feature of the LMV52 is control of the
residual O2 content to increase the boiler's efficiency.
In addition to the features of the LMV51, the LMV52 provides O2 trim control, control of
a maximum of 6 actuators, control of a VSD, and acquisition of cumulated fuel
consumption and current fuel throughput. The LMV52 uses a QGO20, an external
PLL52, and the standard components of the LMV51.
The PLL52 is a detached measuring module for the O2 sensor and for 2 temperature
sensors (Pt1000 / LG-Ni1000). The module communicates with the LMV52 via CAN
bus.
Combustion air
temperature sensor
LMV52...
Figure 116: LMV52with O2 trim control and PLL52
Basic Documentation LMV5...
19 O2 trim control with LMV52 and PLL52
O2 module
CAN
QGO20...
Flue gas
Temperature sensor
PLL...
CC1P7550en
22.05.2018