Siemens LMV50 Series Manual page 7

Building Technologies
19.2 Functioning principle of O2 trim control ...................................................... 252
19.2.1 Air rate change ............................................................................................ 252
19.2.2 Definition of O2 setpoint .............................................................................. 253
19.2.3 Lambda factor .............................................................................................. 253
19.3 Precontrol .................................................................................................... 254
19.3.1 Calculation of precontrol .............................................................................. 254
19.4 O2 trim control ............................................................................................. 255
19.4.1 Operating modes of O2 trim controller / O2 alarm ....................................... 255
19.4.2 Load limitation with O2 trim control ............................................................ 257
19.4.3 Startup ......................................................................................................... 257
19.4.4 Heating up the QGO20 sensor after power ON ........................................... 257
19.4.5 Burner start mode for O2 trim control (only LMV52.4, only in operating modes
O2 Control and conAutoDeac) .................................................................... 258
19.4.6 Initializing and release of the O2 trim controller .......................................... 259
19.4.7 Modulation release on startup ..................................................................... 261
19.4.8 Behavior in the event of load changes (dynamic release criterion) ............. 261
19.4.9 Increasing the manipulated variable in case of fast load changes
(O2ModOffset, formerly O2Offset) .............................................................. 262
19.4.10 Control interventions (switching functions) by the O2 trim controller ........... 263
19.4.11 O2 trim control behavior .............................................................................. 263
19.4.12 Limiting the O2 trim controller manipulated variable with shutdown ............ 264
19.4.13 Deactivating O2 trim control via a contact ................................................... 266
19.4.14 Displaying the O2 trim controller status ....................................................... 267
19.5 O2 alarm ...................................................................................................... 268
19.5.1 Delayed O2 limit value ................................................................................. 268
19.5.2 Switch-off criteria of the O2 alarm ............................................................... 269
19.5.2.1 O2 minimum value alarm ............................................................................. 269
19.5.2.2 O2 maximum value alarm ............................................................................ 270
19.5.3 Inactivation / deactivation of the O2 alarm .................................................. 270
19.6 Self-test ....................................................................................................... 271
19.6.1 O2 Sensor test ............................................................................................. 271
19.6.2 Checking the O2 content (20.9%) ............................................................... 272
19.7 Auxiliary functions ........................................................................................ 273
19.7.1 Warning when flue gas temperature is too high .......................................... 273
19.7.2 Combustion efficiency ................................................................................. 273
19.7.3 Service timer for QGO20 ............................................................................. 274
19.8 PLL52 O2 module ........................................................................................ 275
19.8.1 Inputs and outputs ....................................................................................... 275
19.8.2 CAN bus X84, X85 ...................................................................................... 278
19.9 Configuring the PLL52 ................................................................................ 278
19.10 Configuring the system ................................................................................ 279
19.10.1 Actuators / VSDs ......................................................................................... 279
19.10.2 Parameterizing the type of fuel ................................................................... 279
19.10.3 Setting the user-defined type of fuel ............................................................ 280
19.11 Commissioning the O2 trim control system ................................................. 281
19.11.1 Setting fuel-air ratio control .......................................................................... 281
19.11.2 Setting the O2 alarm .................................................................................... 281
19.11.3 Direct entry of O2 min. values ..................................................................... 282
19.11.4 Measuring the O2 min. values by lowering the air rate ............................... 282
19.11.5 Setting O2 trim control ................................................................................. 283
19.11.6 Checking and changing the controller parameters ...................................... 284
19.12 Setting notes ................................................................................................ 285
19.12.1 Parameterizations ........................................................................................ 285
19.12.2 Setting fuel-air ratio control .......................................................................... 285
19.12.3 Setting the O2 trim controller ....................................................................... 287
19.12.4 Other notes .................................................................................................. 287
Basic Documentation LMV5...
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CC1P7550en
22.05.2018