Azbil AUR890 Series, Руководство пользователя

Страница: 37 / 62

29
Chapter 4. Explanation of Operation
z
Operation when a flame failure occurs (Non-recycling gas-fired combustion)
Input AUR890 operation Sequence
codes
Operation of external devices
Power ON When approximately 8 seconds have passed after the power has been
turned on, the 7-segment LED display on the front panel of the AUR890
shows the sequence code [- -].
- -
Burner
operation
switch ON
- - When the burner operation switch is turned
on, the blower starts to operate, and if the
limit and interlock conditions are normal, a
pre-purge is done. After the pre-purge, the
pre-purge completion signal is turned ON.
Blower: operating
External
controller
ON
If the pre-purge completion signal is ON and the external controller
turns ON, the sequence that follows is start check, ignition standby,
lockout time, standby for normal combustion, and normal combustion.
The FLAME LED (green) on the front panel of the AUR890 lights up.
P8
Pilot valve : open
Main valve : open
During main burner combustion, if a flame failure of the burner occurs
for some reason, after the flame failure response time has passed, the
AUR890 will be locked out so that relays K1, K2, K3, and K4 turn OFF, the
pilot and main valves close, relay K6 turns ON, and the alarm output
turns ON.
FLAME LED (green) on the front panel of the AUR890 turns off, and
ALARM LED (red) turns on.
P8
/
E7
Pilot valve : closed
Main valve : closed
Alarm output : ON
Burner
operation
switch OFF
P8
/
E7
Blower : stop
Reset
Switch ON
Relay K6 turns OFF to turn OFF the alarm output.
The ALARM LED (red) on the front panel of the AUR890 turns off.
- - Alarm output : OFF
–– P1 –– ––
Stop Star
t check
P3
Ignition standb
y
P4
Lock
-out timing
P8 P8/E7 P8/E7
Main bur
ner c
ombustion standb
y
P5
Main bur
ner c
ombustion
Stop Stop Flame failur
e
Lock
-out
AUR890
Pre-purge time
(external circuit)
Start check + Ignition standby time
Approximately 3 s
Approximately 8 s
Lock-out timing time
Flame response
Main burner combustion standby time
Reset time
1 s or longer
[Input]
Power supply
[7-segment display]
Limit, Interlock
[Output]
Ignition transformer
Burner operation switch
Blower
Controller
Combustion signal
Reset switch
[LED]
FLAME LED (Green)
Warning output
Pilot valve
Main valve
ALARM LED (Red)