Azbil AUR450C - Preliminary Inspection Checklist; Flame Voltage Measurement Procedure

4-2
Chapter 4. TRIALRUN ADJUSTMENT
 Preliminary inspection
(1) Inspect all wiring parts.
(2) Check that the device is mounted in a place where the ambient temperature is
within its allowable range.
(3) Check that the AUD300C/500C is mounted correctly. In particular, be sure
the blue lead wire (to terminal 1) and yellow lead wire (to terminal 2) of the
AUD300C/500C are connected correctly. For details, refer to;
 AUD300C user’s manual, No. CP-SP-1141E
AUD500C user’s manual, No. CP-SP-1328E
(4) Check that the valves and cocks of each fuel system are closed and that the in-
side of the fuel chamber is vented sufficiently.
(5) After items (1) to (4) above have been checked, supply the power and start the
trial-run adjustment.
 Measurement of flame voltage (flame signal)
Start the equipment and measure the voltage under several conditions, such as
start-up operation and normal operation.
(1) Set the FSP136A range to 7.5 V.
(2) Connect the positive probe of the FSP136A to the FLAME VOLTAGE + termi-
nal on this device and the negative probe to the FLAME VOLTAGE - terminal.
(3) Check that the voltage is stable and 2.0 V DC or more.
Recommended flame voltage: Stable 2.0 V DC or more.
(4) If the flame voltage fluctuates widely, check the AUD300C/500C’s mounting
position and wiring condition.
Handling Precautions
•
Always use IV wire with a cross-sectional area of 0.75 mm
2
or more for signal
lines. The wiring length must be 10 m or less.
•
A measuring instrument connected to this device should have an input im-
pedance of 100 kΩ or more.
Note
•
Even during normal operation, the flame voltage is synchronized with the shutter
operation of the AUD300C/500C and fluctuates between 0.1 to 0.3 V.
•
On the device, the average flame voltage can be checked on the 7-segment
display.