Siemens LME39.100C2 - Flame supervision with AGQ3.xA27 and flame detector QRA...

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Building Technologies Division Basic Documentation LME39… CC1P7106en
6 Technical data 08.12.2017
6.5 Flame supervision with AGQ3.xA27 and flame
detector QRA...
Only in connection with LME39.xxxx2 (AC 230 V)!
Mains voltage AC 230 V +10%/-15%
Mains frequency 50...60 Hz 6%
Perm. cable length from QRA... to
AGQ3.xA27 (lay separate cable)
Max. 20 m, unshielded
Perm. cable length from AGQ3.xA27 to
LME39.xxxx2
Max. 2 m, unshielded
Weight of AGQ3.xA27 Approx. 140 g
Mounting position Optional
Degree of protection IP40, to be ensured through mounting
Power consumption 4.5 VA
At mains voltage UN
AC 220 V AC 240 V
Detector voltage at QRA... (with no load)
Terminal 3 off (refer to program sequence) DC 400 V DC 400 V
Terminal 3 on (refer to program sequence) DC 300 V DC 300 V
Detector voltage
Load by DC measuring instrument Ri >10 M
Terminal 3 off (refer to program sequence) DC 380 V DC 380 V
Terminal 3 on (refer to program sequence) DC 280 V DC 280 V
DC current detector signals with flame detector QRA... Min. required Max. possible
Measurement at the flame detector QRA… 200 µA 500 µA
Table 4: Data QRA...
The correct functioning of aged UV cells can be checked with a UV test by applying a
higher voltage to the UV cell after controlled shutdown until terminal 3 carries voltage.
Connection diagram Measuring circuit for measuring
the UV flame current
Figure 7: Connection diagram AGQ3.xA27 Figure 8: Measurement made at the
flame detector QRA…
C Electrolytic capacitor 100...470 µF; DC 10...25 V bl Blue
M Microammeter Ri max. 5,000
 br Brown
QRA... Flame detector gr Grey
GP Pressure switch (old: rt = red)
SB Safety limit thermostat sw Black
R
Control thermostat or pressurestat
W
Limit thermostat or pressure switch
Ancillary unit AGQ3.xA27
Legend