8. Alarm
8.1 Introduction
8.1.1 Alarm indication
When an alarm protection becomes active in the system, an active alarm is added to the alarm list. The alarm can give both a
visual and audible indication (subject to design of the system).
Alarms, typically, require action and acknowledgement before they clear from the alarm list.
An alarm may also have a latch as an extra level of protection, so that in addition to acknowledging the alarm, you also have
to unlatch the alarm before the alarm action can be deactivated.
Figure 8.1
Example display unit
No. Item Notes
1. Alarm indicator (LED) Displays the current alarm situation for the system.
2. Horn output silence push-button Used to silence the horn output, if configured.
Alarm indicator (LED)
The alarm indicator shows the current alarm situation for the system.
PPM 300 Operator's manual 4189340910 UK
www.deif.com Page 117 of 157
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