Models FL3100H/3101H
55
8.0 Troubleshooting
8.1 Troubleshooting
CAUTION:
Component level repair must be undertaken either by General Monitors’
personnel or by competent authorized service engineers. SMT PCB repair shall
only be performed at a GM facility.
8.1.1 Introduction
Included in this section is a troubleshooting table. The information included is designed to cope
with the more common faults, which occur during commissioning and operation and which are
repairable by a competent operator. Should the various actions suggested in the table fail to
restore normal operation, the unit should be returned to General Monitors for repair. A complete
written description of the problem should be included.
Be sure to inhibit or disconnect external alarm wiring before making any check that might send
the unit into alarm.
NOTE
:
On no account should repair of the electronic circuit be undertaken by anyone other
than General Monitors’ personnel or authorized representative. Failure to comply with
this requirement will invalidate the warranty.
Table 33: Troubleshooting Table
PROBLEM
POSSIBLE CAUSE
CORRECTIVE ACTION
No output signal and green LED
in UV window is off.
No DC Power to the Unit
Be sure the +24 VDC is applied with
the correct polarity.
No output signal and green LED
in UV window is rapidly blinking.
Low voltage FAULT (voltage at
unit less than +18 VDC).
Be sure that the unit is powered with at
least +20 VDC under load.
2 mA signal and green LED in
UV window is slowly blinking.
COPM FAULT, dirty or obscured
optical path (UV or IR window)
Clean UV and IR window and
associated source light rods.
Constant 12 mA signal with no
known radiation to detector
(FL3100H only).
Background UV radiation at
detector.
Cover UV portion of FL3100H for ten
seconds to determine if there is
background UV. If there is, remove UV
radiation source or change FL3100H
location. If there is no background UV,
replace UV detector tube in FL3100H.
Constant 16 mA or 20 mA signal
(WARN or ALARM) with no
known radiation at detector
(FL3101H only).
Background UV radiation at
detector.
Cover UV portion of FL3101H for ten
seconds to determine if there is
background UV. If there is, remove UV
radiation source or change FL3101H
location. If there is no background UV,
replace UV detector tube in FL3101H.
Summary of Contents for FL3101H
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Page 70: ...63 Models FL3100H 3101H 10 7 Final Assembly Figure 24 P N 71450 FL3100H UV IR Final Assembly ...
Page 71: ...Models FL3100H 3101H 64 Figure 25 P N 71451 FL3101H UV Final Assembly ...
