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 variety of applications requiring

supervision of alarm and signalling contacts in power plants, substations

and industrial process installations. The alarm unit is also approved for

use in off-shore installations and marine applications.

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 process situation.

The annunciator unit also provides 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 connected together via a fibre-optic bus to form complete

supervision, event sequence reporting and data acquisition systems.

The annunciator unit is a member of SPACOM, 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 aluminium 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 indicator 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 continuously monitors the hardware and the soft

ware of the unit. The system also supervises the operation of the auxiliary

supply module and the level of the electronics' voltages generated by the

module. If a permanent fault is detected, the fault indicator on the front

panel is lit, the output relay of the self-supervision system operates and

the outputs are blocked.

Auxiliary supply voltage

The auxiliary supply of the relay is obtained from an internal plug-in type

power supply module. Two auxiliary power module types are available:

type SPGU 240A1 for the supply voltage range 80…265 V ac/dc and type

SPGU 48B2 for the supply voltage range 18…80 V dc. The power supply

module forms the internal voltages required by the annunciator.