Separate Flame Supervision (Only Lmv50 / Lmv52) - Siemens LMV50 Series Manual

Β
Application example
Implementation
Technical data, flame
supervision
Building Technologies
The self-test function of the QRI / QRA7 is triggered by increasing the supply voltage to
the level of self-test voltage. During the following test time, the signal voltage at the
output of the QRI / QRA7 changes to zero so that the LMV5 will receive the anticipated
flame OFF signal as a response to the test. If the behavior is correct, operation is
continued until the next test cycle is reached.
4.1.1.2

Separate flame supervision (only LMV50 / LMV52)

The flame signals to 2 channels (channel «A» for QRI / QRA7 or QRB, and channel
«B» for ION). As an alternative for ionization current supervision – using the AGQ1 –
the QRA2 / QRA4 or QRA10 can be connected to the ionization input of the LMV5 The
connection / processing of the individual flame signals are selected via 6 parameters
(Pilot phase, Operating phase, Extraneous light – each for gas- and oil-firing). The pilot
phase covers phases 40 through 50 and operating phase 52 through 62. In all the other
phases, the flame signal(s) is (are) evaluated via parameter SensExtranl...
The parameters offer the following setting choices:
∂
Single-detector operation (corresponding to the LMV51, plus error message if 2
flame detectors are connected)
∂
QRI_B or ION (parallel operation of QRI / QRA7 / QRB and ION, flame signal if 1 of
the 2 channels indicates a flame)
∂
QRI_B and not ION (parallel operation of QRI / QRA7 / QRB and ION, flame signal
if only the QRI / QRA7 / QRB indicates a flame)
∂
QRI_B (flame signal if the QRI / QRA7 / QRB indicates a flame; ION is not
evaluated)
∂
ION and not QRI_B (parallel operation of QRI / QRA7 / QRB and ION, flame signal
if only ION indicates a flame)
∂
ION (parallel operation of QRI / QRA7 / QRB and ION, flame signal if ION indicates
a flame; the QRI / QRA7 / QRB will not be evaluated)
∂
QRI_B and ION (both must indicate a flame; this selection is not available with the
Extraneous light block)
Note!
To use the setting QRI_B and not ION or ION and not QRI_B in phases for
extraneous light detection is not permitted.
Selective monitoring of the pilot ignition with ionization without continuous pilot: Which
means that the ionization probe only detects the pilot flame. The main flame is
supervised with the QRI / QRA7.
Parameter SensExtranl... must be set to QRI_B | ION, which means that extraneous
light is detected if 1 of the 2 flame detectors indicates that a flame is present.
Parameter SensOperPhGas must be set to ION, which means that in the pilot phases
(phases 40 through 50), only ION is evaluated (QRI / QRA7 don't care). Parameter
SensOperPhGas or SensOperPhOil must be set to QRI_B&/ION, which means that in
the operating phases (phases 52 through 62) only the QRI / QRA7 may deliver a flame
signal. With these parameter settings, a flame signal via ION in the operating phases
leads to safety shutdown due to Loss of flame in operation.
Ι
Note!
All measured voltages refer to connection terminal N (X10–02 pin 4).
Basic Documentation LMV5...
4 Burner control
33/327
CC1P7550en
22.05.2018