Siemens LMG2 Series Manual page 8

Flame supervision with
AGQ2...A27 and UV
detector QRA...
Legend
Connection diagram
Measurement circuit
Legend
8/16
Operating voltage AC 230 V +10 % / -15 %
Mains frequency 50 Hz -6 %...60 Hz +6 %
Environmental conditions
Transport
Climatic conditions
Temperature range
Humidity
Mechanical conditions
Operation
Climatic conditions
Temperature range
Humidity
Detector voltage at QRA... (with no load)
To the end of «t10» and after a controlled shutdown
From the beginning of «t1»
Detector voltage
Loading by DC meter Ri > 10 MΩ
To the end of «t10» and after a controlled shutdown
From the beginning of «t1»
DC current detector signals with UV detector QRA...
Measurement made on UV detector
For UV detector QRA..., refer to data sheet 7712
Ancillary unit AGQ2...A27
When used in connection with burner controls LMG2..., the UV ancillary unit
AGQ2...A27 is required.
Using circuitry (A) or (B), the quench test on ageing UV detectors can be made in two
different ways:
Type of circuitry:
(A) Operation with a permanent line
•
UV test at twice the supply voltage
across the UV cell on startup and after a
controlled shutdown
L M G 2 ...
*
1 2 2 1 1
(B )
G P /S B
R /W
L
b l rt
b r
(A )
L
sw
N
+
Q R A
-
Measurement made on UV detector
M
Q R A
+ - - +
s w +
b l
C
s w
b l
C Electrolytic capacitor 100...470 µF; DC 10...25 V
bl blue
sw black
gr grey
CC1N7421E December 04, 1998
Max. permissible cable lengths
QRA... to AGQ2...A27
(separate cable)
AGQ2...A27 to LMG2...
IEC 721-3-2 Weight
class 2K2 AGQ2...A27
-40...+60 °C QRA...
< 95 % r.h.
class 2M2 Mounting position
IEC 721-3-3
class 3K5 Degree of protection
-20...+60 °C
< 95 % r.h. Power consumption
min. required
1
sw
AGQ2...A27
b l
L M G 2 ...
1 2
refer to data sheet 7714
At mains voltage U
N
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
max. possible
200 µA 500 µA
(B) Operation with a controlled line
•
UV test at twice the supply voltage on
startup only, during the interval between
controlled startup and air pressure signal
–
No voltage at the UV cell after a
controlled shutdown
–
No full substitute for mode (A)
described above since an aged UV cell
can regenerate itself
AGQ2.1A27
AQG2.2A27
Microammeter Ri max. 5000 Ω
M
QRA... UV detector
Landis & Staefa Division
20 m
20 m
approx. 140 g
optional
IP 40
4.5 VA