Fault Elimination And Messages; General - Dräger REGARD 3900 Series Instructions For Use Manual

7

Fault elimination and messages

7.1

General

Fault
Display shows noth-
ing and all LEDs off
Nothing shown on
display
Display shows NO
INPUTS
Display shows
4–20 BOARD
ERROR
or
RELAY BOARD
ERROR
or
OUTPUT BOARD
ERROR
LED and display test
failed
"Power DC" LED is
not lit, but display is
on
Display shows
Under-range
Display shows Over-
range
The "Fault (F)" LED
lights up for a single
channel
Cause
No power supply to control
unit
Faulty energy supply unit
Faulty internal wiring
No power supply to display
PCB
Faulty ribbon cable
Faulty input, relay or output
module
Faulty display PCB
Faulty power supply to the
control unit
Faulty display PCB
Faulty transmitter connector Check the transmitter wiring
Loop current incorrect
Faulty transmitter
Short circuit in the remote
sensor transmitter wiring
Faulty remote sensor trans-
mitter
Faulty transmitter wiring
Loop current incorrect
Faulty transmitter
Faulty input module
®
REGARD 3900
Fault elimination and messages
Remedy
Check the external supply
and the wiring and repair
Replace the energy supply
unit
Check the power distribution
internal wiring and repair
Check that the ribbon cable
is connected to the display
PCB and all modules, and if
necessary, reconnect and
replace display PCB
Repair or replace ribbon
cable
Replace the faulty module
Replace display PCB
Check the internal or exter-
nal 24 V DC power supply
and repair
Replace display PCB
and repair
Re-calibrate
Replace the transmitter
Check the transmitter wiring
and repair
Check and repair the trans-
mitter
Check the transmitter wiring
and repair
Re-calibrate
Replace the transmitter
Replace input module