IRIS P522 Noise Interference, And Grounding, automatic gain control AGC action see, Orificing

IRIS MODEL P522 APPLICATION MANUAL

ful discrimination, it is likely due to the	3. Check the voltage at pins 4 (26 VDC)
automatic gain control (AGC) action (see	and 5 (PWR GND) of the viewing
sections on the viewing heads for a de-	head connector. If the voltage is zero,
tailed explanation of this problem).	check the wiring of the connector for
When using the PbS only or the S506	shorts and/or replace the viewing head
(same for the S512), make sure the sig-	cable. If 26 VDC is measured, then
nal is not saturating, particularly at	the viewing head may be defective,
high load conditions. (Refer to section	and should be replaced.
ORIFICING.)	C. FLAME SIGNAL SHOWS ON DIS-
C. For the S550, the S552 and the S556, see	PLAY; FLAME ON RELAY AND
corresponding manual(s).	LIGHT ARE OFF.
TROUBLESHOOTING GUIDE	1. The viewing head is incorrectly wired,
A. NO FLAME SIGNAL and NO DISPLAY	or defective (see B, above).
1. Check wiring (refer to section WIR-	2. The set point values for flame ON
	are incorrect.
ING AND INSTALLATION).
2. Check the voltage at PWR IN termi-	D. FLAME SIGNAL SHOWS ON ANA-
	LOG BARGRAPH DISPLAY; FLAME
nals with a volt meter. It should mea-
	ON LIGHT IS OFF; LOCKOUT
sure approximately 26 VDC. If not,
	LIGHT IS ON.
check the power supply and wiring,
or replace the power supply.	1. The viewing head may be defective.
3. If 26 VDC is measured, remove the	2. There may be a noise or ground-
power for 10 seconds. If the self-re-
	ing problem (see NOISE INTER-
setting fuse has tripped, removing then
	FERENCE AND GROUNDING,
reapplying power will reset the fuse.
	following section).
B. DIGITAL DISPLAY IS SHOWING	3. Press RESET button on front panel.
0000 AND NO FLAME SIGNAL
	E. 1-9 LED STAYS ON
1. Using a volt meter, check at viewing
head A terminals, on the bottom of the	1. There may be a noise or grounding
mother board, for 26 VDC across +V	problem (see D2, above).
and GND. If the voltage is low, check	2. The viewing head may be defective.
the power supply. If the supply is okay,
removing and reapplying the power af-	F. FRONT PANEL BUTTONS DO NOT
ter 10 seconds will reset the 0.25A self-	RESPOND.
resetting fuse if it has tripped.	1. The P522 front panel may be locked out.
2. If the voltage measures 26 VDC at
	NOISE INTERFERENCE
P522 terminals, remove the connector
from the viewing head, and open the	AND GROUNDING
red connector (refer to viewing head	On the plug-in terminals going to the viewing heads

wiring diagram of this plug, Figure 2).

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-

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