Dräger REGARD 39 0 Series Instructions For Use Manual page 76

Fault elimination and messages
Fault
Control unit displays
a different gas value
than the remote sen-
sor transmitter
The "Fault (F)" LED
lights up (constantly)
or flashes when a
channel is inactive
Ingress of water
Output module fault Cause
No signal from all
outputs; green LED
does not light up
No signal from all or
some of the outputs;
green LED lights up
The output is con-
stantly at 1 ± 0.3 mA.
Output constant, but
gas value on display
changes
Output signal is too
low or less than
20 mA
Fault
Transfer of configu-
ration to or from the
control unit not possi-
ble
Display shows a
failed calibration
7.2 Fault with the Polytron remote sensor transmitter
Polytron warning signal
The Polytron transmitter warning signal (every 10 seconds, 1 second long 3 mA)
triggers the fault relay (F1) on the input module if the alarm threshold is set above
2.9 mA. If the fault relay is non-latching, the relay changes its status temporarily
Cause
Faulty transmitter calibration Re-calibrate
Faulty input channel calibra-
tion
Input channel range set
incorrectly
Configuration error
Faulty sealing
No power supply to the mod-
ule
Faulty output module
Wrong channels selected on
the output module
No signal from the input
modules
Faulty output module
Alarms locked
Load resistance too high
Cause
No power supply to control
unit
Faulty interface unit (RS-
232)
Faulty remote sensor trans-
mitter
Remedy
Re-calibrate
Set the same range for the
input channel as for the
transmitter
Move the inhibit switch to
position 1, then move back to
position 0
Check the sealing ring of the
cover, cable entries and the
front label and repair
Remedy
Check ribbon cable to the
module and repair/replace
Replace output module
Place the jumper on the cor-
rect connections of the out-
put module
Check ribbon cable and con-
nect/repair
Replace output module
Move inhibit switch back to
position 0
Reduce load resistance
Remedy
Check the external supply
and the wiring and repair
Check the interface unit and
repair/replace
Check the transmitter wiring
and repair and re-calibrate
®
REGARD 3900