Azbil AUR450C - Internal Block Diagram and External Devices

3-2
Chapter 3. OPERATION
 Internal block diagram
The internal block diagram below shows an example of wiring with external
devices.
High potential
side (H)
Low potential
side (G)
Power supply circuit
1413
17
1
10
12
11
24
23
K6
Flame output
K5
Alarm output
AUD300C/500C
(ame detector)
2
Fuse
R S
K6
K2
K2
K7
K3
K4
Shutter-driving
circuit
External reset
input circuit
8
9
Flame
amplifying
circuit
18
16
F
G
Interrupted pilot valve 2
Ignition transformer
Interrupted pilot valve 1
Main valve 1
21
22
20
19
External reset
input
AUR450C
Blue
Yellow
White
White
103X
Alarm relay
7
Main valve 2
K1
Input circuit
Interlock
input circuit
15
Burner start
contacts
Prepurge
end
Emergency
stop circuit
Blower on-o circuit
and prepurge circuit
Gas pressure upper
limit interlock
Gas pressure lower
limit interlock
(Interlock/
Limit contacts)
Vibration
detection
limit
Overtemperature
limit
Air pressure lower
limit interlock
*
103X
Fuse
* Air pressure switch
Configure a verification circuit that does the following:
• When the blower is about to start, and there is no air flow, the circuit should verify
that no pressure is detected. If pressure is detected under these conditions, the
blower should not be started.
Note
•
JIS B8415 defines ignition times as follows.
Pilot burner ignition time: within 10 s.
Main burner ignition time: within 5 s.