Flame Supervision; Ancillary Unit - Siemens LME SERIES Installation Manuals

Technical data (cont´d)

Flame supervision

with AGQ3...A27 and
UV detector QRA...

Ancillary unit

AGQ3...A27
Legend
Building Technologies
HVAC Products
Mains voltage
Mains frequency
Perm. cable length from QRA... to
AGQ3...A27 (lay separate cable)
Perm. cable length from AGQ3...A27 to
LME...A2
Weight of AGQ3...A27
Perm. mounting position
Degree of protection
Power consumption
Detector voltage at QRA... (with no load)
Terminal 3 off (refer to control sequence)
Terminal 3 on (refer to control sequence)
Detector voltage
Load by DC measuring instrument Ri > 10MΩ
Terminal 3 off (refer to control sequence)
Terminal 3 on (refer to control sequence)
DC current detector signals with UV detector
QRA...
Measurement at the UV detector QRA...
In connection with LME...A2 burner controls, use of UV ancillary unit AGQ3...A27 is
mandatory.
(A) Correct functioning of aged UV cells can be checked as UV test with a higher
supply voltage across the UV cell after controlled shutdown until terminal 3 on.
Connection diagram
LME...A2
12 2 3
GP/SB
R/W
L
bl rt
br
(A)
L
sw
N
QRA...
C Electrolytic capacitor 100...470µF; DC 10...25 V
M Microammeter Ri max. 5,000Ω
QRA... Flame detector
GP Gas pressure switch
SB Safety limit thermostat
R Control thermostat or pressurestat
W Limit thermostat or pressure switch
AC 230 V +10% / -15%
50...60Hz ±6%
Max. 20m
Max. 2m
Approx. 140g
Optional
IP40, to be ensured through mounting
4.5VA
Measuring circuit for measuring the UV
detector current
AGQ3...A27
1
br
sw
AGQ3...A27
bl
+
-
Measurement made at the UV detector
QRA...
At mains voltage U
AC 220 V AC 240 V
DC 400 V DC 400 V
DC 300 V DC 300 V
DC 380 V DC 380 V
DC 280 V DC 280 V
Min. required Max. possible
200µA
bl rt sw
sw bl
bl Blue
br Brown
gr Grey
rt Red
sw Black
N
500µA
11/25
CC1N7101en
27.11.2008