Siemens LME39 Series - Flame Supervision (UV Detector); Ancillary Unit AGQ3...A27; Connection Diagrams (Technical)

10/17
Building Technologies CC1N7106en
HVAC Products 20.02.2008
Technical data (cont´d)
Only in connection with LME39…A2 (AC 230 V)!
Mains voltage AC 230 V +10% / -15%
Mains frequency
50...60 Hz ±6%
Perm. cable length from QRA... to
AGQ3…A27 (lay separate cable)
Max. 20 m
Perm. cable length from AGQ3...A27 to
LME39...A2
Max. 2 m
Weight of AGQ3...A27 Approx. 140 g
Mounting position Optional
Degree of protection IP40, to be ensured through mounting
Power consumption 4.5 VA
At mains voltage U
N
AC 220 V AC 240 V
Detector voltage at QRA... (with no load)
Terminal 3 off (refer to control sequence) DC 400 V DC 400 V
Terminal 3 on (refer to control sequence) DC 300 V DC 300 V
Detector voltage
Load by DC measuring instrument Ri >10 MΩ
Terminal 3 off (refer to control sequence) DC 380 V DC 380 V
Terminal 3 on (refer to control sequence) DC 280 V DC 280 V
DC current detector signals with UV detector
QRA...
Min. required Max. possible
Measurement at the UV detector QRA… 200 µA 500 µA
With LME39…A2 burner controls, use of the AGQ3...A27 UV ancillary unit is mandatory.
(A) The correct functioning of aged UV cells can be checked with a UV test by ap-
plying a higher voltage to the UV cell after controlled shutdown until terminal 3
carries voltage.
Connection diagram Measuring circuit for measuring
the UV detector current
12
23
1
7106a02/1107
GP/SB
L
L
N
QRA...
+
-
br
bl
rt
sw
AGQ3...A27
sw
bl
(A)
LME39...A2
R/W
11
br
bl
rt
sw
AGQ3...A27
sw
bl
QRA
7101a06/1107
Measurement made at the UV
detector QRA…
C Electrolytic capacitor 100...470 µF; DC 10...25 V bl Blue
M
Microammeter Ri max. 5,000 Ω
br Brown
QRA... UV detector gr Grey
GP Gas pressure switch rt Red
SB Safety limit thermostat sw Black
R Control thermostat or pressurestat
W Limit thermostat or pressure switch
Flame supervision
with AGQ3…A27 and
UV detector QRA...
A
ncillary unit
A
GQ3...A27
Legend