What is Alarm Annunciator?

An Annunciator pane is a system for alerting factory alarm users. There are multiple back-lit windows, each represents with a system alarm title. Lamps in each window are regulated by the plant’s hardwired buttons, designed to function when a system situation occurs in an unusual state.


The annunciator system should be intended to operate on ungrounded 110VDC or 220VDC. All remote contacts used for trouble annunciation should be electrically independent of contacts used for another purpose so annunciator circuits are separated from DC circuits.

The annunciator equipment should use solid state logic units, lighted window or LED type, designed and tested for surge with standing capacity in accordance with IEC.

Working cycle:

The working cycle of the switchboard advertiser should be manual or automatic.

If there is an SER or SCADA circuit backup, an automatic restart should be used. The reset characteristics of the annunciators should be matched to guarantee adequate function when the system is monitored and transported through the SCADA scheme. Operational series of switchboard annunciators.

Some alarm points have multiple simultaneous gear connections. These are usually transformer bucholz and strain relief valve operations. A Light Annuciator control panel is prevalent to all systems. Using the suitable unit problem status pushbutton, one unit at a moment can be chosen.

When the switchboard announcer is enabled, a visual sign is given. The buttons showing display window is usually clustered by the annunciator points of the button panel and provides the user with vital problem status.

The Light Annunciator window offers back-up for a continuous event recorder. Remote control buttons for the unit switch board anuciator should be given on the control panel to mute and activate the switch board anuciator.

Annunciator boards were comparatively expensive to assemble because the alarm triggering equipment in the process facility needed specialized wiring. A lamp sample key was always given as incandescent bulbs were used to enable early detection of unsuccessful lights.