IMPLEMENTATION OF OPTIONAL REQUIREMENTS 4.29-4.30 OF EN12094-1 STANDARD PENDING IN THE NEW MINI EXFIRE360: DETAILED DESCRIPTION
With regard to regulatory aspects, the plant complies not only with the mandatory requirements of the standards EN 54-2, EN 54-4 (fire detection systems) and EN 12094-1 (extinguishing systems), EN 60079-29-1 (systems Gas revelation ATEX ) but is certified for performing a series of optional functions covered by the same regulations and commonly required in industrial fire-fighting systems.
Consider, by way of example, the availability of a standard input and output interface for the bidirectional communication of the control panel with third-party systems; or the command of fire protection systems, or, again; the management of shutdown groups of reserve and supervision of pressure signals (high / low) of the systems themselves.
The central EXFIRE360 was, therefore, developed implementing technological solutions to meet the requirements of standards EN54-2, EN54-4, EN12094-1, EN60079-29-1, GOST, shortly, UL864 and IEC61508 TUV, the protocol used Hochiki APOLLO.
NEW EN12094-1 SHUTDOWN CONFIGURATION FOR EXFIRE360
This section introduces the implementations that will be performed both on the EXFIRE360 control panel and on its compact version (mini exfire360); meet the requirements of points 4.29 (release of extinguishing agents for selected discharge zones); 4.30 (activation of alarm devices with signals different) of the EN12094-1 standard.
Compared to the EX6EV-C board currently certified for the shutdown; SV intends to propose a new configuration in which the role of the individual input/output channels; is not defined in which the logic is performed directly by EXCPU360.
To explain the operation of this new configuration, refer to the diagram of a two-zone detection and extinguishing system shown in the following figure:
The boards used to manage this system will be 2 EX6EV, 2 EX6SO and 2 EX8SI (or an EXLOOP -E in addition for the only part of detection).
Analyzing the individual signals in detail, we will have that:
The detection will be performed acquiring at least 2 signals of conventional type for the zone ( EX8SI or EX6EV card ) or through devices of addressable type (EXLOOP-E-card). The solenoid activation logic defined in the control unit configuration program ( SV Protection);
The discharge buttons will be acquired under a conventional input (EX8SI or EX6EV). The control panel configuration program will be modified so that for each input channel a specific functionality can be defined (eg manual release, abort button, etc);
The same principle also used for all remaining inputs (emergency stop and extension buttons, automatic/manual mode selectors; main / reserve switches; high and low-pressure switches, general system supervision signals);
As far as the outputs are concerned; the EX6EV board will remain the card responsible for controlling the zone solenoids (directional valves) and can also activate the optical/acoustic warning devices pre-discharge and discharge completed (point 4.30). The functionality of the individual outputs defined in the control panel configuration program. An EX6EV card will be provided for each discharge zone;
The EX6SO cards will instead take care of the solenoids of the main / reserve cylinder banks common to both the shutdown systems; as well as the implementation of any additional alarm devices. The function of the individual outputs defined through SV Protection;
To meet the requirement of the standard according to which a generic fault must not affect more than one discharge zone, the commands to the common solenoids will be redundant (in the above example we will need 8 outputs in total, for this we will use 2 EX6SO );
Control of auxiliary devices such as ventilation blocking; closing shutters, etc. it carried out through the unsupervised outputs of the EX6EV; board and the intervention logic will be freely programmable by the user through SV Protection;
The control of the system status and the activation logic performed through the EXCPU360 control units; according to the functionalities defined in the configuration program.
For example, the inhibition of the discharge in the presence of a fault on an emergency extension device decided by evaluating the status of all the devices configured as HOLD in the Protection. In this way it will also be possible to configure multiple inputs or output lines with the same functionality;
Through the menus of the same display; it will also be possible to modify the settings (discharge delay / reset inhibit time / etc) of each extinguishing zone; as well as disable (at access level 3) the discharge itself.
The previous example is related to a “complete” configuration. With the same type of logic, it will, in any case; possible to manage even less complex plants (for example, a single zone with a high-pressure switch; a discharge button and a single solenoid to drive).
Unlike the previously certified configuration, locked on the use of an EX8SI card and an adjacent EX6EV; the new approach will cover the plant and regulatory requirements with a single board (EX6EV); it expanded with additional input cards (EX8SI o EXLOOP-E) or output (EX6EV or EX6SO); depending on the characteristics of the system.
REMOTE CHASSIS Mini Exfire360 (CONCENTRATOR)
Paragraph 12.3.2 of EN 54-2 provides for the possibility of installing the ccs on several enclosures; provided that the integrity requirements of the transmission support referred to in point 12.5.3.
The chassis of the EXFIRE360 control panels can, therefore; installed in enclosures separate from the control panel; stating that these containers will be equivalent to those of the EXFIRE360 central unit in the “mini exfire360” version.
These concentrators powered by the supply equipment referred to in point B); or alternatively; by the power supply unit of the EXFIRE360 control panel; depending on the installation requirements.