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 parameterization 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 variety of applications requiring monitoring of

analog quantities such as temperature, current, 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 sensors 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 indication of earth faults in the transducers or the

transducer wiring.

The alarm channel inputs accept the following 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 temperature 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 activated by a making or a breaking contact.

The values measured can be shown as numerical 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-buttons and the display on the front panel, or via

the serial interface.

When a measured signal exceeds or fallsbelow the set start value of the channel avisual

indication is obtained on the alarmpanel. At the same time the acoustic alarmoutput contact

picks up and, if configured, agroup alarm relay operates. The event thusgenerated is stored

in the event register.

Any information generated in the annunciatorunit can be read by a hierarchically superiorsystem

via the serial interface.

Data communication

The relay is provided with a serial interfaceon the rear panel. By means of a bus connection module

type SPA-ZC 17/S or SPAZC 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 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 software of the equipment. The system also supervises the operation of the

auxiliary supply module and the electronics voltages generated by the module.

Auxiliary supply voltage

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

Two auxiliary power module versions 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.