Net Safety UV/IRS-H2-A, User Manual

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ADDENDUM
TROUBLESHOOTING GUIDE: UV/IRS Flame Detectors
* See “Reflector Positioning” on page 9, “Cleaning Window/Lens and Reflector” on page 19 and “Manual VI (MVI) Test” on pages 17 & 18.*
Condition Possible Cause Possible Solution
Detector intermittently powers up/down

Faulty power supply or /wiring.

Faulty electronics.

Replace power supply or/ check wiring.

Contact factory.
Detector does not power up - Green LED Off
(See Figure 7 when locating LEDs, also refer to
“Start Up Procedure” on page 15)

Faulty power supply or/wiring.

Voltage to detector outside specified range.

Blown inline fuse.

Faulty electronics (no power to detector)

Replace power supply or/ check wiring.

Change/correct input voltage to detector.

Replace inline fuse.

Contact factory.
Unstable 4-20mA signal

Unshielded cables used for wiring or improper
shield and ground connection.

Faulty electronics.

Confirm shield & ground wiring. Follow wiring
guidelines specific to installation & equipment.

Contact factory.
No 4-20mA Output Signal (0 mA) at and after
start-up (see “Start Up Procedure” on page 15)

Open/broken 4-20mA signal loop wiring.

Faulty electronics.

Close 4-20mA signal loop wiring.

Contact factory.
1.0mA Fault - Solid Yellow LED
(See Figure 7 on page 15 when locating LEDs)

Power supply failure.

Supply voltage to detector less than 10Vdc.

Detector internal power supply failure.

Replace power supply.

Confirm supply voltage (10-32Vdc) to detector.

Contact factory.
1.6mA Fault - Flashing Yellow LED
(See Figure 7 on page 15 when locating LEDs)

VI test fault in UV path.

*Align reflector properly. Clean reflector &/or
lens. Perform MVI test. Contact factory.
1.8mA Fault - Flashing Yellow LED
(See Figure 7 on page 15 when locating LEDs)

VI test fault in IR path.

*Align reflector properly. Clean reflector &/or
lens. Perform MVI test. Contact factory.
2.0mA Fault - Flashing Yellow LED
(See Figure 7 on page 15 when locating LEDs)

Missing VI reflector.

Complete misalignment of VI reflector.

Dirty VI reflector &/or lens.

Damaged or cracked lens.

*Fit & align VI reflector. Perform MVI test.

*Align VI reflector properly. Perform MVI test.

*Clean VI reflector &/or lens. Perform MVI test.

Contact factory.
6mA Output Signal
8mA Output Signal

UV radiation detected.

IR radiation detected.
OR

Detector sensor(s) too sensitive.

Locate & remove background UV radiation.

Locate & remove background IR radiation.

Adjust sensitivity & time delay settings. See
pages 13 & 14
16mA or 20mA, no fire present

UV & IR radiation present.

Damaged or faulty sensor(s).

Faulty electronics.

Locate & remove background UV & IR radiation.

Contact factory.

Contact factory.
erroneous relay state
( for –AR, analog-relay model detector )

Voltage to detector outside specified range.

Faulty electronics.

Adjust power supply voltage /check wiring.

Contact factory.
REF-0005 (Rev 0)
December 09, 2010.