ABB SACO16D1-AA Digital Annunciator Unit

Features

• Flexible, field-customizable 16-channel

annunciator unit

• Alarm channels activated by normally open

or normally closed contact

• Four output relays, i.e. two for group

realarms, one for an audible device and

one for the self-supervision system

• Parameter selection and adjustment from

front panel or via serial interface

• First-out alarm indication with clear four

digit display on the front panel

• Extensive data communication via the

serial interface and the SPA bus

• Sophisticated hardware and software self

supervision system for maximum opera

tional reliability under the most demanding

environmental conditions

• Powerful software support for parameter

ization of the unit via the serial interface

• Member of the SPACOM product family

and ABB’s Distribution Automation system

• CE marking according to the EC directive

for EMC

Application

The digital annunciator unit is used in a vari

ety of applications requiring supervision of

alarm and signalling contacts in power plants,

substations and industrial process installa

tions. The alarm unit is also approved for use

in off-shore installations and marine applica

tions. Further, the annunciator unit can be

used in any application where on/off signals

are to be supervised.

The annunciator unit provides immediate

fault recognition, fault identification and

visual and audible alarm in an abnormal pro

cess situation. The annunciator unit also pro

vides a means for subsequent fault analyses,

which means that corrective measures can be

carried out without delay and full control of

the process can be maintained.

The annunciator units can be used as indepen

dent stand-alone units, or they can be con

nected together via a fibre-optic bus to form

complete supervision, event sequence report

ing and data acquisition systems.

The annunciator unit is a member of SPA

COM, the ultimate integrated secondary

equipment system for power systems.

Design

The annunciator unit is composed of four

modules: an alarm annunciator module, an

input/output module, a connection module

and a power module, housed in a rugged alu

minium casing.

The alarm annunciator module includes 16

alarm channels. The channels are activated by

normally open or normally closed process

contacts. The required 48 V dc contact circuit

voltage is generated and supervised by the

annunciator unit. Each channel can separately

be assigned a start delay from 5 ms to 160 s.

On activation of a channel the visual indica

tor of the channels starts blinking. One of five

standardized blinking systems according to

ISA and DIN can be selected by the operator

at commissioning.

The annunciator is provided with a first-out

indication given via the four-digit alphanu

merical display on the front panel. The first

out alarm is indicated with a letter A and the

channel number.

The annunciator unit is also provided with an

event register, which stores the last nine

events in chronological order. The event reg

ister can be read via the push-buttons and the

display on the front panel or via the serial

interface.

The annunciator holds four output relays, two

of which are used as group alarm output

relays. One of five modes of operation can be

selected for the realarm output relays.

One output relay is dedicated for the self

supervision system and one for the control of

an audible device, such as a buzzer or a horn.

Any information generated in the annunciator

unit can be read by a hierarchically superior

system via the serial interface.

Data communication

The annunciator unit is provided with a serial

interface on the rear panel. By means of a bus

connection module type SPA-ZC 17/S or

SPA-ZC 21/S the unit can be connected to the

fibre-optic SPA bus. The bus connection

module type SPA-ZC 21/S is powered from

the host unit, whereas the bus connection

module SPA-ZC 17/S is provided with a

built-in power unit, which can be fed from an

external secured power source. The unit com

municates with higher-level data acquisition

and control systems over the SPA bus.

Self-supervision

The annunciator incorporates a sophisticated

self-supervision system which increases the

availability of the device and the reliability of

the system. The self-supervision system con