34
Troubleshooting
FL500 UV/IR Flame Detector
US
7 Troubleshooting
WARNING!
Repair or alteration of the device beyond the scope of the maintenance instructions in this manual or
by anyone other than General Monitors or General Monitors-approved service personnel can cause
incorrect operation of the device and put persons who use this device for their safety at risk of serious
injury or death.
During a Fault condition, the device does not monitor the area for flame.
7.1 Troubleshooting Table
The troubleshooting table gives information about common faults that occur during commissioning
and operation. These common faults can be repaired by a competent operator.
Before you do the following corrective actions, inhibit or disconnect the external alarm wiring to
prevent an accidental Alarm High condition.
Problem Possible Cause Corrective Action
No output signal and all LEDs
are off
No dc power to the device
Make sure that 24 Vdc is
applied with the correct polarity.
2 mA signal, green LED is off,
yellow LED is blinking
Device is in COPM Fault
Clean the optical window and
reflectors. Refer to Section 5.2
"Cleaning the Optical Window"
for instructions.
0 mA, 1.25 mA, or 3.5 mA
signal, and yellow LED is on
Low supply voltage or other
fault
Make sure that the supply
voltage is ≥20 Vdc at the
device. If it is, cycle the power
to see if the fault is removed.
Constant 8 mA signal with no
known radiation to device
Background IR radiation at
device
Put a cover over the optical
window for 10 seconds. If the
device senses background IR,
and the analog output still
shows 8 mA, contact technical
support for more trouble-
shooting.
Constant 12 mA signal with no
known radiation to device
Background UV radiation at
device
Put a cover over the UV part of
the optical window for 10
seconds. If the device senses
background UV, and the analog
output still shows 12 mA,
contact technical support for
more troubleshooting.
Constant 16 mA or 20 mA
signal (Alarm Low or Alarm
High) with no known radiation
at device
Background UV radiation at
device
Put a cover over the optical
window for 10 seconds. If the
analog output still shows
16 mA or 20 mA, contact tech-
nical support for more trouble-
shooting.
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