Oldham MX 52, Installation Manual

Page: 16 / 48

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2.3.
OPERATING MODES
2.3.1. Buzzer
During normal operation and whenever there is a fault or an alarm, the buzzer is triggered.
The buzzer is stopped by pressing the CLEAR key or by clearing remotely. The buzzer emits
a continuous or discontinuous sound (depending on how the facility is programmed) should
an alarm threshold be exceeded.
2.3.2. Light-emitting diodes (LEDs) (fig26)
Each channel has 5 LEDs (which are visible and labelled on the FRONT panel) :
LED UNLIT PERMANENTLY LIT FLASHING
GREEN
Channel not in
service
Channel in service
1
st
red AL 1 not
triggered
AL 1 threshold exceeded (with
automatic cancellation)
AL 1 threshold exceeded
(with manual cancellation)
and not cleared
2
nd
red AL 2 not
triggered
AL2 threshold exceeded (with
automatic cancellation)
AL 2 threshold exceeded
(with manual cancellation)
and not cleared
3
rd
red AL 3 not
triggered
AL 3 threshold exceeded (with
automatic cancellation)
Yellow
No fault
Channel faulty
- channel being calibrated or
programmed
- Sensor being calibrated
2.3.3. Alarm thresholds
Each of the 3 alarm thresholds can be programmed independently for each channel (see
“Channel programming” menu).
During normal operation a gas alarm is triggered only after a programmed lag, so as to avoid
untimely alarms.
The alarm thresholds can be dealt with in the following ways :
-
during a normal cycle with manual cancellation
-
during a normal cycle with automatic cancellation
-
during a parking cycle