ABB SACO 16 A3 Analog Annunciator Unit

Features

• Powerful, flexible and field-customizable

16-channel analog input signal annunciator

unit

• A full choice of 26 standardized field

selectable channel input signal types

• Four alarm/trip levels per channel; two low

set and two high set points

• The last thirty events with time markings

stored for local presentation

• Bar graph, curve or numerical display of

set and measured parameter values

• Extensive data communication via the

serial interface and the SPA bus

• Parameter selection and adjustment from

front panel or via serial interface

• 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 relay, for reading measured

and recorded values, events, etc., and for

storing readings

• Member of the SPACOM product family

and ABB s Distribution Automation system

• CE marking according to the EC directive

for EMC

Application

The analog annunciator unit is used in a vari

ety of applications requiring monitoring of

analog quantities such as temperature, cur

rent, voltage, power, etc. in power plants,

substations and industry. The equipment is

also used in off-shore installations. For tem

perature measurement standard Pt or Ni sen

sors are used. For measuring electrical

quantities measuring transducers with stan

dard mA or V outputs are employed.

The annunciator units can be used as indepen

dent stand-alone units, or they can be inte

grated via a fibre-optic bus to form complete

supervision, event sequence reporting and

data acquisition systems.

Design

The channels of the analog annunciator unit

measure voltage, current and resistance via

sensors or transducers in the process. Further,

contact signals can be wired to the input

channels. The signal type can be separately

set for each channel.

The channel inputs are galvanically separated

from earth and from the digital part of the

annunciator electronics, but the channels are

galvanically interconnected. This arrange

ment facilitates the supervision and the indi

cation of earth faults in the transducers or the

transducer wiring.

The alarm channel inputs accept the follow

ing signal levels: 0 5 mA, 1 5 mA,

0 20 mA and 4 20 mA, 0 1 V, 0 5 V,

1 5 V, 0 10 V and 2 10 V. The following

standard sensors types can be used for tem

perature measurement: Pt 100. Pt 250.

Pt 1000. Ni 100. Ni 120. Ni 250. Ni 1000.

Further, any Pt or Ni signal within the range

65 1000 Ω, potentiometric signal within the

range 0 200 Ω, 0 500 Ω, 0 1 kΩ,

0 2 kΩ, 0 2.5 kΩ, 0 10 kΩ can be used

and scaled. For the resistance sensors two- or

three-wire connection can be used.

In addition, the input channels can be acti

vated by a making or a breaking contact.

The values measured can be shown as numer

ical values, bar graphs or curves on the dot

matrix display on the front panel. The same

information can also be read by a superior

system via the serial interface.

The content of the event sequence register

can be read on the display. The total system

can be configured by means of the push-but

tons and the display on the front panel, or via

the serial interface.

When a measured signal exceeds or falls

below the set start value of the channel a

visual indication is obtained on the alarm

panel. At the same time the acoustic alarm

output contact picks up and, if configured, a

group alarm relay operates. The event thus

generated is stored in the event register.

Any information generated in the annunciator

unit can be read by a hierarchically superior

system via the serial interface.

Data communication

The relay is provided with a serial interface

on the rear panel. By means of a bus connec

tion module type SPA-ZC 17/S or SPA

ZC 21/S the relay can be connected to the

fibre-optic SPA bus. The bus connection

module type SPA-ZC 21/S is powered from

the host relay, 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 relay

communicates with higher-level data acquisi

tion and control systems over the SPA bus.

Self-supervision

The annunciator incorporates a sophisticated