Troubleshooting - Dräger Regard 3900 Instructions For Use Manual

Troubleshooting

Troubleshooting
7
Symptom
Display screen blank and all LEDs off
Display screen blank
Display screen shows: NO INPUTS
Display screen shows:
4–20 BOARD ERROR or
RELAY BOARD ERROR or
OUTPUT BOARD ERROR
LED and display screen test fails
Power DC /
LED not illuminated, but
display screen on
Display screen shows: Under-range
Display screen shows: Over-range
Fault (F) LED illuminated for a single
channel
Fault (F) LED illuminated for a group of
four channels.
Input module fitted, but no LEDs
illuminated or data on the display
screen for the module
Controller gas level different to the
level displayed at the remote sensor
transmitter
Fault (F) LED illuminated (steady) or
flashing when channel inactive
Water ingress
Output module faults
No signal from all outputs; green LED
not illuminated
No signal from all or some outputs;
green LED illuminated
Output is constant at 1 ± 0.3 mA.
Output constant but gas-level on
display screen changing
Output signal too low or will not reach
20 mA
26
Fault
No supply to controller
Faulty power supply unit
Internal wiring fault
No supply to display board
Ribbon cable fault
Faulty input, relay or output module
Faulty display board
Controller supply fault
Faulty display board
Faulty transmitter connection
Incorrect loop current
Faulty transmitter
Short-circuit remote sensor transmitter
wiring
Remote sensor transmitter fault
Transmitter wiring fault
Incorrect loop current
Faulty transmitter
Faulty input module
Transmitter wiring fault
Ribbon cable fault
Faulty input module
Ribbon cable fault
Internal wiring fault
Faulty input module
Faulty display board
Transmitter calibration fault
Input channel calibration fault
Input channel range incorrectly set
Configuration error
Faulty seal
No supply to module
Faulty output module
Incorrect channels selected on output
module
No signal from input modules
Faulty output module
Alarms inhibited
Load resistance too high
Remedy
Check and repair the external supply
and wiring
Replace power supply unit
Check and repair internal power
distribution wiring
Check and reconnect ribbon cable to
display board and all modules
Replace display board
Repair or replace ribbon cable
Replace the faulty module
Replace display board
Check and repair the external or
internal 24 Vdc supply
Replace display board
Check and repair the transmitter wiring
Recalibrate
Replace the transmitter
Check and repair the transmitter wiring
Check and repair the transmitter
Check and repair the transmitter wiring
Recalibrate
Replace the transmitter
Replace input module
Check and repair the transmitter wiring
Check and repair/replace ribbon cable
Replace input module
Check and repair/replace ribbon cable
Check and repair internal power
distribution wiring
Replace input module
Replace display board
Recalibrate
Recalibrate
Set the input channel range the same
as the transmitter range
Set the inhibit switch to position 1, then
return it to position 0
Check and repair the cover sealing
ring, cable entries and the front cover
information label
Check and connect/repair ribbon cable
to module
Replace output module
Move link to the correct terminals on
the output module
Check and connect/repair the ribbon
cable
Replace output module
Return inhibit switch to position 0
Reduce load resistance
Regard 3900 Series