FEC920: USER GUIDE
Page 79
September 18
6.4.4 Alarm 2 menu
As above for Alarm 1 menu.
6.4.5 Alarm types
The following figures attempt to show graphically the meanings of the alarm parameters which can be set for
the various alarm types available.
ABSOLUTE ALARMS
Figure 71 Absolute alarm parameters
Note:
The parameters ‘Acknowledge’, ‘Active’, ‘Inactive’, ‘N(ot) Acknowledged’ and,
‘Acknowledgement’ can all be ‘wired’ to other parameters, so, for example, a relay can be
made to operate whilst the alarm is inactive or whilst it is active or on acknowledgement etc.
by wiring the relevant parameter to the relay’s ‘PV’ input. See Section 10 for details of user
wiring.
Threshold
Hysteresis
Input signal
Hysteresis: 0
Dwell: 0
Hysteresis: 0
Dwell: D
Hysteresis: yes
Dwell: 0
Hysteresis: yes
Dwell:D
Absolute high alarm definitions
Absolute low alarm definitions
Symbol
Symbol
Threshold
Hysteresis
Input signal
Hysteresis: 0
Dwell: 0
Hysteresis: 0
Dwell: D
Hysteresis: yes
Dwell: 0
Hysteresis: yes
Dwell:D
= Alarm active
= Alarm active
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