I.R.I.S. FLAME MONITORING SYSTEM P522 - Manual (Page 18)

IRIS MODEL P522 APPLICATION MANUAL
Page 18
ful discrimination, it is likely due to the
automatic gain control (AGC) action (see
sections on the viewing heads for a de-
tailed explanation of this problem).
When using the PbS only or the S506
(same for the S512), make sure the sig-
nal is not saturating, particularly at
high load conditions. (Refer to section
ORIFICING.)
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 AND INSTALLATION).
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, remove the
power for 10 seconds. If the self-re-
setting fuse has tripped, removing then
reapplying power will reset the fuse.
B. DIGITAL DISPLAY IS SHOWING
0000 AND NO FLAME SIGNAL
1. Using a volt meter, check at viewing
head A terminals, on the bottom of the
mother board, for 26 VDC across +V
and GND. If the voltage is low, check
the power supply. If the supply is okay,
removing and reapplying the power af-
ter 10 seconds will reset the 0.25A self-
resetting fuse if it has tripped.
2. If the voltage measures 26 VDC at
P522 terminals, remove the connector
from the viewing head, and open the
red connector (refer to viewing head
wiring diagram of this plug, Figure 2).
3. Check the voltage at pins 4 (26 VDC)
and 5 (PWR GND) of the viewing
head connector. If the voltage is zero,
check the wiring of the connector for
shorts and/or replace the viewing head
cable. If 26 VDC is measured, then
the viewing head may be defective,
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; LOCKOUT
LIGHT IS ON.
1. The viewing head may be defective.
2. There may be a noise or ground-
ing problem (see NOISE INTER-
FERENCE AND GROUNDING,
following 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 P522 front panel may be locked out.
NOISE INTERFERENCE
AND GROUNDING
On the plug-in terminals going to the viewing heads
at the bottom of the P522, the terminals marked GND
go to pin 5 on the viewing head plug (see section
WIRING OF VIEWING HEAD). Pin 5 of the view-