Siemens LME71 Series Basic Documentation page 4

Smart Infrastructure
4.10 Dummy plug for RJ11 .................................................................................... 34
4.11 Environmental conditions .............................................................................. 35
4.12 Flame supervision ......................................................................................... 36
4.12.1 Ionization probe ............................................................................................. 36
4.12.2 QRA2 / QRA4 / QRA10 (LME71 / LME73 only) ............................................ 38
4.12.3 QRB1/QRB3/ QRB4 ...................................................................................... 39
4.12.4 QRC ............................................................................................................... 41
5 Dimensions .................................................................................................... 42
6 Function ......................................................................................................... 43
6.1 Preconditions for burner startup .................................................................... 43
6.2 Undervoltage ................................................................................................. 43
6.3 Controlled intermittent operation ................................................................... 43
6.4 Control sequence in the event of fault ........................................................... 44
6.5 Resetting the LME7 ....................................................................................... 44
6.6 Restart limitation ............................................................................................ 45
6.6.1 Restart in the event of loss of flame .............................................................. 45
6.6.2 Repetition in case of no flame is established by the end of safety time
(TSA) ............................................................................................................. 45
7 Operation, indication, diagnostics .................................................................. 46
7.1 Operation ....................................................................................................... 46
7.2 Indication of operating state .......................................................................... 46
7.3 Diagnostics of cause of fault .......................................................................... 47
8 Inputs / outputs .............................................................................................. 49
9 Connection diagram AGG9 connector ........................................................... 50
9.1 LME71 ........................................................................................................... 50
9.2 LME72 ........................................................................................................... 51
9.3 LME73 ........................................................................................................... 52
10 LME7 burner control ...................................................................................... 53
10.1 Description of inputs and outputs .................................................................. 53
10.2 Digital input .................................................................................................... 54
10.2.1 Safety Loop terminal X3-04 pin 1 and 2 ....................................................... 54
10.2.2 Input for external controller (ON/OFF) terminal X5-03 pin 1 ......................... 54
10.2.3 Air pressure switch terminal X3-02 ............................................................... 55
10.2.4 Input gas pressure switch-min ....................................................................... 55
11 Multistage or modulating mode with actuator ................................................ 56
11.1 Relevant parameters ..................................................................................... 56
11.1.1 Connection diagram for feedback potentiometer ASZ12.33 .......................... 56
Basic Documentation LME7...
Contents
4/116
CC1P7105en
24.07.2020