Siemens LME72.000A2 - Page 12

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Building Technologies Division Basic Documentation LME7… CC1P7105en
Infrastructure & Cities Sector Contents 29.11.2011
25.8.2 Reset ........................................................................................................... 218
26 Error code list with operation via internal LED............................................. 219
27 PWM settings ..............................................................................................221
27.1 Relevant parameters ................................................................................... 221
27.2 PWM control parameters............................................................................. 223
27.3 PWM safety parameters .............................................................................. 224
27.4 Initial PWM parameter settings.................................................................... 225
27.4.1 Initial settings of PWM basic parameters ....................................................225
Prerequisites................................................................................................ 225
Operating steps ........................................................................................... 225
27.4.2 Reading the value of parameter 920 in the prepurge phase (P30) and
ignition load phase (P38, P40 and P44) ...................................................... 228
Procedure ....................................................................................................228
27.4.3 Final settings of PWM safety parameters.................................................... 229
Procedure ....................................................................................................229
Follow these steps....................................................................................... 229
Checking prepurging ................................................................................... 230
Checking the ignition load ........................................................................... 230
27.4.4 Setting safety parameters 675.00/675.01 and checking the safety
settings under worst-case conditions ..........................................................231
Procedure ....................................................................................................231
Follow these steps....................................................................................... 231
Checking prepurging ................................................................................... 231
Checking the ignition load ........................................................................... 232
27.4.5 Matching the working points “Speeds for low-fire (P1), ignition load
(P0) and high-fire (P2) for the heating engineer to the application.............. 232
Prerequisites................................................................................................ 232
27.4.6 ... via the onboard operating panel of the LME7... basic unit ......................233
27.4.7 ... via the AZL2... operating unit...................................................................234
27.5 Overview of PWM fan parameters (value range refers to PME71.901) .....236
28 List of figures ............................................................................................... 242