Dräger Regard 3900, Инструкция по эксплуатации, Страница: 75 / 292

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_ REGARD
®
3900
Fault elimination and messages _
Display shows NO
INPUTS Faulty ribbon cable Repair or replace ribbon
cable
Display shows
4–20 BOARD
ERROR
or
RELAY BOARD
ERROR
or
OUTPUT BOARD
ERROR
Faulty input, relay or output
module Replace the faulty module
LED and display test
failed Faulty display PCB Replace display PCB
"Power DC" LED is
not lit, but display is
on Faulty power supply to the
control unit Check the internal or exter-
nal 24 V DC power supply
and repair
Faulty display PCB Replace display PCB
Display shows
Under-range
Faulty transmitter connector Check the transmitter wiring
and repair
Loop current incorrect Re-calibrate
Faulty transmitter Replace the transmitter
Display shows Over-
range
Short circuit in the remote
sensor transmitter wiring Check the transmitter wiring
and repair
Faulty remote sensor trans-
mitter Check and repair the trans-
mitter
The "Fault (F)" LED
lights up for a single
channel Faulty transmitter wiring Check the transmitter wiring
and repair
Loop current incorrect Re-calibrate
Faulty transmitter Replace the transmitter
Faulty input module Replace input module
The "Fault (F)" LED
lights up for a group
of four channels. Faulty transmitter wiring Check the transmitter wiring
and repair
Faulty ribbon cable Check ribbon cable and
repair/replace
Faulty input module Replace input module
Input module
installed, but LEDs
do not light up or no
data for module on
the display Faulty ribbon cable Check ribbon cable and
repair/replace
Faulty internal wiring Check the power distribution
internal wiring and repair
Faulty input module Replace input module
Faulty display PCB Replace display PCB
Fault Cause Remedy