Qrc - Siemens LME71 Series Basic Documentation

Green LED for
indication of operating
mode
Connection diagram
Smart Infrastructure

4.12.4 QRC

Warning!
The QRC is only suitable for operation at 230 V AC. Failure to observe this
information poses a risk of damaging the safety functions.
Operating voltage
Mains frequency
Required detector current in operation
Possible detector current in operation
Perm. length of detector cable
(normal cable, laid separately) ¹)
¹)
Multicore cable not permitted
Check the flame intensity via the AZL2 or the internal LED display (flame current, FL2).
The maximum possible QRC flame current is limited to approx. 60 µA for system-
specific reasons. The maximum display intensity (parameter 954 in the AZL2 or via
internal LED display FL2) corresponds to 100%.
Threshold values when flame is supervised by QRC

Start prevention (extraneous light)
Intensity
Flame current
Operation, minimum required flame signal
Intensity
Flame current

Signaling good/bad flame (LED starts flashing green during operation)
Intensity
Flame current

Typical flame signal during operation
Intensity

Maximum flame signal during operation
Intensity
Flame current
Parameters AZL2
954 FL2
The values specified in the table only apply under the following ambient conditions and
may vary under other conditions:

Mains voltage 230 V AC

Ambient temperature 23°C
Detector current in operation:

Flame signal instable

Green LED flashing
QRC
Key
sw Black
bl Blue
br Brown
Basic Documentation LME7...
4 Technical data
230 V AC ±15%
50 to 60 Hz 6%
Min. 20 µA (display intensity approx. 35%)
Max. 60 µA (display intensity 100%)
Max. 3 m (core-core 100 pF/m)
AZL2 (parameter 954) or FL2 >10%
>10 µA
AZL2 (parameter 954) or FL2 >35%
Approx. 20 µA
AZL2 (parameter 954) or FL2 approx. 50%
Approx. 30 µA
AZL2 (parameter 954) or FL2 ≥60%
AZL2 (parameter 954) or FL2 ≤100%
Approx. 60 µA
Function
Flame intensity
< 50%
Detector current in operation:

Flame signal stable

Green LED steady on
> 50%
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CC1P7105enr
24.07.2020