Oldham MX 52, Commissioning, Operating And Maintenance Manual

Page: 20 / 96

20
then
The user can interrupt the self-test cycle before it is completed by pressing the
ACKNOWLEDGEMENT key.
3.3. Operating modes
3.3.1. Audio warning device (buzzer)
In normal operation, the audio warning device is triggered whenever a fault or an alarm appears.
The audio warning device can be stopped by pressing the ACKNOWLEDGEMENT key or by
remote acknowledgement. The buzzer makes a continuous or discontinuous sound (according to the
programming of the unit) if an alarm threshold is exceeded.
3.3.2. Light-emitting diodes (LED) (Fig. 26)
Each channel is equipped with five LEDs (visible and identified on the FRONT panel).
LED Extinguished Illuminated
in steady mode
Flashing
GREEN Channel not in
service
Channel in service Threshold AL1 exceeded
(manual clearing) and not
acknowledged
1st red AL1 not triggered Threshold AL1 exceeded
(automatic clearing)
Threshold AL2 exceeded
(manual clearing) and not
acknowledged
2nd red AL2 not triggered Threshold AL2 exceeded
(automatic clearing)
3rd red AL3 not triggered Threshold AL3 exceeded by mean
or time (automatic clearing)
Yellow No fault Fault on channel -Channel being calibrated or
programmed
- Detector being calibrated
3.3.3. Alarm thresholds
Each of the three alarm thresholds can be programmed independently for each channel. (See the
“Channel programming” menu).
MX 52 v2.

xx LEL CH4
*** SELF-TEST ***
xx LEL CH4
Line corresponding to
the channel displayed
when the ENTER key
was pressed