Azbil AUR355 - Chapter 4 How this Device Operates; Sample Instrumentation for Manual Ignition (Intermittent Pilot)

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Chapter 4. How This Device Operates
CAUTION
After turning on the power, allow sufficient time before checking the output of this device.
This device does not start operation until about 8 seconds after power-on.
After a fault stop is canceled, start input is not accepted for about 5 seconds.

Sample instrumentation for manual ignition (intermittent pilot)
F
G
Flame detection
circuit
Shutter drive
circuit
Flame sensor
Shutter coil
S1
S2
+
+
AUD300C/500C
ame detector
L1
L2
(N)
K 3
Input
circuit
K5
Control
circuit
(CPU)
Contact
reset
Start
R1-3
R2-1R1-1
R2-2
R1-2
Ignition switch
Ignition transformer
Pilot valve
Main valve
Stop
switch
Limit
DC24 V
K7 K8
K 6
13
14
15
16
17
18
19
20
21
22
23
24
1
2
3
4
6
7
8
9
10
11
12
R1
R2
Power circuit
2.5 A
5
Operation Operation of this device SHUT
LED
FL
LED
7-seg.
Power ON
Limit ON
Voltage is applied to terminals 2 and 3 (to the AUR355C and
AUD300C/500C)
 
- -
Ignition switch ON Relay R1 turns on when R2-2 turns off.
When R1-3 turns ON, relay K3 (start check relay) turns ON.
 
PF
When a pilot flame is detected, relays K7, K8 and K5 turn ON.
When contacts R1-2 turn ON, relay R1 remains ON and, at the same time,
contacts R1-1 and R2-1 turn ON and pilot valve output continues.

z
PF
When K5 and K3 turn ON, the main valve enters standby mode.

z
PF
Ignition switch OFF Terminals 6 and 7 are powered and the main valve starts operating.

z
PF
Stop operation
Stop switch OFF
Power to all loads is shut off and relays R1 and R2 turn OFF.
 
- -
Flame failure during
operation
All relays turn OFF.
 
- -
z
: Lit, : Off, : Blinks