Dräger REGARD 3900 Serie Instrucciones De Uso página 74

Fault elimination and messages
– The messages on the display disappear (e.g. over-range).
– External warning devices remain activated or deactivated depending on
configuration.
Remote acknowledgement
Remote acknowledgement is a switch that has the same functions as the button
Acknowledge/OK, but outside the control unit.
Hold / II / ▲
Controls the scroll function and switches between the gas type and the measuring
range on the display field.
● Press Hold / II / ▲ for less than 1 second to switch display scrolling on/off (if
using more than 4 channels).
● Press Hold / II / ▲ for longer than 1 second to toggle between the gas type and
the measuring range.
Only REGARD® 3920
Using the ▲ / ▼ / OK buttons on REGARD® 3920, you can also navigate to the
settings within the integrated configuration menus and select them.
6.7 LED and display test
By pressing and holding two control buttons at the same time, the LEDs, the display
and the internal acoustic alarm sounder of the control unit can be tested. While the
buttons are pressed, all the LEDs light up (the power AC LED only lights up when
the corresponding connector), all segments of the display field are filled and the
acoustic alarm sounder emits an audible tone.
– REGARD® 3900: Press Acknowledge and Hold
– REGARD® 3910: Press OK and II
– REGARD® 3920: Press OK and ▲
This feature can be used if needed for reliability testing of the visual and acoustic
output of the control unit.
7 Fault elimination and messages
7.1 General
Fault
Display shows noth-
ing and all LEDs off
Nothing shown on
display
Cause
No power supply to control
unit
Faulty energy supply unit
Faulty internal wiring
No power supply to display
PCB
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
®
REGARD 3900