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.

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.