IRIS P520, Руководство по применению

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IRIS MODEL P520 APPLICATION MANUAL
Page 23
C. For the S550, the S552 and the S556, see
corresponding manual(s).
TROUBLESHOOTING GUIDE
A. NO FLAME SIGNAL and NO DISPLAY
1. Check wiring (refer to section WIR-
ING REAR PCB).
2. Check the voltage at PWR IN termi-
nals with a volt meter. It should mea-
sure approximately 26 VDC. If not,
check the power supply and wiring,
or replace the power supply.
3. If 26 VDC is measured, check F1 on
the P520 main PCB (this is a .75 Amp,
20mm fuse).
Note: In order to change this fuse, the
back plate (which is fastened to the side
extrusions with four M2.5 screws) must
be removed. Use a small Phillips screw
driver to remove the screws, then slide
out the top cover. Very carefully discon-
nect the ribbon cable from the main PCB
by ejecting it with the two levers on the
connector header, and slide out the PCB.
The fuses F1 and F2 are located toward
the rear of the PCB (near the output re-
lays).
B. DIGITAL DISPLAY IS SHOWING
0000 AND NO FLAME SIGNAL
1. Remove the connector from the view-
ing head, and check the wiring (refer
to the viewing head wiring diagram,
Figures 2 & 3.)
2. Using a volt meter, check at viewing
head terminals on rear PCB for 26
VDC V and PWR GND. If
the voltage is low, check the power
supply. If the voltage is zero, check
fuse F2 on the main PCB (this is a .25
Amp, 20 mm fuse).
3. If the voltage measures 26 VDC at
viewing head terminals, check the
voltage at pins four (26 VDC) and five
(PWR GND) of the viewing head con-
nector. If the voltage is zero, check
the wiring and/or replace the viewing
head cable. If 26 VDC is measured,
then the viewing head may be defec-
tive, and should be replaced.
C. FLAME SIGNAL SHOWS ON DIS-
PLAY; FLAME ON RELAY AND
LIGHT ARE OFF.
1. The viewing head is incorrectly wired,
or defective (see B, above).
2. The set point values for flame ON are
incorrect.
D. FLAME SIGNAL SHOWS ON ANA-
LOG BARGRAPH DISPLAY;
FLAME ON LIGHT IS OFF; LOCK-
OUT LIGHT IS ON.
1. The viewing head may be defective.
2. There may be a noise or grounding
problem (see NOISE INTERFER-
ENCE AND GROUNDING, fol-
lowing section).
3. Press RESET button on front panel.
E. 1-9 LED STAYS ON
1. There may be a noise or grounding
problem (see D2, above).
2. The viewing head may be defective.
F. FRONT PANEL BUTTONS DO NOT
RESPOND.
1. The P520 may be in remote operation
mode.
NOISE INTERFERENCE AND
GROUNDING
The viewing head terminals marked GND on the rear
backplane PCB are wired to pin 5 on the viewing