B&G Hydra 2000, User Manual

Page: 30 / 147

Hydra 2000 User Manual
Part 2 - Operating Information
HB-0844-02
2- 14
(6) Press Page to return to the normal display.
2.7 ALARMS
2.7.1 Alarm Control
When a pre-set alarm parameter is reached, e.g. the depth
reducing, the system raises an alarm automatically. In an alarm
condition, the lower display changes to highlight the cause of the
alarm and flashes red and green alternatively until the
Enter Key
is pressed twice. At which point all the FFDs except the one on
which
Enter was pressed, return to normal. The audible alarm, if
fitted, is also silenced by this operation. After this, the lower
display continues to monitor the alarm condition. The alarm is still
active and, if the alarm parameter is again exceeded, the alarm will
flash/sound as necessary. The displayed alarm function remains
on the lower display until
Page is pressed.
2.7.2 Alarm Types
The system incorporates the following types of alarm:
HI ALARM - This is initiated if the value of a function
exceeds a pre-set level.
LO ALARM - This is generated if the value of a function
drops below a pre-set level.
SECTOR ALARM - This is generated when the value of a
function leaves the safe sector as shown in Fig 2.2.
Example
Fig 2.2 - Sector Alarm