FL4000
59
6.0 Troubleshooting
6.1 Troubleshooting Chart
This section is intended to be a guide to correcting problems, which may arise in the field.
General Monitors should be contacted for assistance if the corrective action listed does not
eliminate the problem. Defective units should be returned to General Monitors for repair with a
complete written description of the problem.
NOTE:
If the equipment is under warranty, any repairs performed by persons other than
General Monitors’ authorized personnel may void the warranty. Please read the
warranty statement carefully.
CAUTION
: Be sure to inhibit or disconnect external alarm wiring before making any check that
might send the unit into alarm.
Table 36: Troubleshooting Chart
PROBLEM
POSSIBLE CAUSE
CORRECTIVE ACTION
Analog output signal = 0 mA
and green LED in window is
off
No DC power to the Unit
Be sure that the +24 VDC is applied
with the correct polarity
Analog output signal = 0 mA
(3.5 mA with HART) and
green LED in window is
rapidly blinking
Low voltage FAULT (voltage at
unit is approxi18.5 VDC)
Be sure that the unit is powered with
at least +24 VDC under load
Analog output signal = 0 mA
(3.5 mA with HART) and
green LED in window is
rapidly blinking, +24 VDC
verified
Flash Checksum Not OK
Re-cycle power to the unit
Analog output signal = 0 mA
(3.5 mA with HART) and
green LED in window is
rapidly blinking, +24 VDC
verified OK, power was re-
cycled
Flash Checksum Still Not OK
Call GM customer support
Analog output signal = 2 mA
(3.5 mA with HART) and
green LED in window is
slowly blinking
COPM FAULT, dirty or obscured
optical path (detector window)
Clean the window and reflector
Dipswitch settings do not
match those observed in the
operation of the detector
Device settings may have
been changed by either HART or
MODBUS and no longer
correspond to those on the
dipswitch
Recycle power to the unit while
connecting the test IO terminal to
ground (refer to Section 3.9 ). After
startup, adjust settings via dipswitch
as described in Sec. 3.7 (Switch
Selectable Options)