Means shall be provided to transmit the information concerning the blocked position.
The normal transition of the non-electrical disable device from the operational position to the blocked position shall not result in an activation of the output as required in 4.3.2 e).
An indication and activation of the output as required in 4.3.2 e) shall be given if the non-electrical disable device remains in a position which is neither the fully operational nor blocked (see 4.19.2).
Emergency hold device (Option with requirements)
NOTE This subclause relates to 4.3.2 j).
The e.c.d. may provide technical means to connect emergency hold devices.
The signal of the emergency hold device shall not influence the extinguishing signal once established.
By the operation of the emergency hold device one of the following function sequences shaii be started:
The extinguishing signal shall not be activated as long as the emergency hold device is continuously operated. De-activation of the operation of the emergency hold device after the end of the specified pre-discharge warning time shall cause the transmission of the extinguishing signal immediately. The pre-discharge warning time shall not be interrupted, shortened or reset by the signal from the emergency hold device. Activation of the emergency hold device shall be indicated visibly and audibly (if audible indication was silenced before) at the e.c.d. The visible indication shall be given at access level 1 by means of a separate light emitting indicator for each flooding zone and shall remain until manual reset.
The extinguishing signal shall not be activated while the emergency hold device is continuously operated. The pre-discharge warning time shall be re-started from the beginning by each release of the emergency hold device. The activation of the emergency hold device during the pre-discharge warning time shall be indicated in the protected area by a change of the signal to the alarm devices.
NOTE The intention of this is to provide a different audible signal from thatgiven during the pre-discharge time delay period and the released condition.
Activation of the emergency hold device shall be indicated visibly and audibly (if audible indication was silenced before) at the e.c.d. The visible indication shall be given at access level 1 by means of a separate light emitting indicator for each flooding zone while the emergency hold device is activated.
Faults of the transmission path to the emergency hold device shall be recognised and indicated within 2 s and prevent the transmission of the extinguishing signal.
If an emergency hold function is provided, the e.c.d. shall have at least a common output able to transmit the information of the activation of the emergency hold device.
Control of flooding time (Option with requirements)
NOTE This subclause relates to 4.3.2 I).
The e.c.d. may be designed to control the flooding time, for instance in the case of low pressure CO2 systems.
£ іт the e.u.u. is intenoeu to control the тюооіпд time, e.g. in <,02 low pressure systems, the flooding timo shall be adjustable from a minimum time specified by the manufacturer up to at least 300 s. The setting shall be done in steps of maximum 5 s and is restricted to the access level 3. The adjusted flooding time shall be indicated at least at access level 3 (e.g. label).
The set flooding time shall not be affected by other components like fire detection and alarm devices.
The set flooding time shall remain within deviation limits of ± 10% of the set value.
If the e.c.d. is intended to control the flooding time, means shall be provided which for test purposes allow the termination of an already running flooding time. This shall only be possible by means of a separate manual control at access level 3. The operation shall have no effect on the intended operation of the e.c.d. after this test.
Initiation of secondary flooding (Option with requirements)
NOTE This subclause relates to 4.3.2 m).
The e.c.d. may be designed to initiate a secondary flooding, for instance in the case of low pressure CO2 systems, including the reception of a signal from a manual triggering device specifically for this function.
A secondary flooding shall not be initiated when the manual triggering device is operated during the normal flooding. Upon operation of the manual triggering device after completion of the normal extinguishing sequence, the initiation of a secondary flooding shall only be possible when the alarm sounders are not yet silenced. In this case the secondary flooding shall be initiated immediately after the operation of this special manual triggering device.
NOTE If the alarm sounders have been silenced or the system was reset this special manual triggering device has no function.
Manual only mode (Option with requirements)
NOTE This subclause relates to 4.3.2 n).
The e.c.d. may be designed to change over from manual only mode to automatic/manual mode and vice versa.
The status of the manual only mode shall be indicated visibly on the e.c.d. and an output shall be provided that is able to transmit the information about this mode.
Changing of the mode shall be possible by manual operation at access level 2 or upon an input signal (e.g. from a key switch).
The visible indication shall be given for each flooding zone at access level 1 by one or both of the following means:
- physically separated light emitting indicators;
■ an alphanumeric display.
During the manual only mode, the activation of the e.c.d. shall only be possible by signals from manual triggering devices.
Triggering signals to equipment within the system (Option with requirements)
NOTE This subclause relates to 4.3.2 o).
The e.c.d. may be designed to transmit triggering signals to equipment within the fire extinguishing system (e.g. pilot cylinders, optical warning devices).
Concerning the transmission paths for triggering signals to equipment within the system, the requirements of 4.13 to 4.16 shall be satisfied.
Extinguishing signals to spare cylinders (Option with requirements)
NOTE This subclause relates to 4.3.2 p).
The e.c.d. may be designed to transmit extinguishing signals to spare cylinders or spare cylinder banks.
If a main and a spare bank are provided, it shall be indicated on the e.c.d. that the spare bank will be activated in case of alarm. The indication shall be given at access level 1 by a physically separated light emitting indicator or by an alphanumeric display.
Concerning the transmission paths for extinguishing signals to spare cylinders, the requirements of 4.13 to 4.16 shall be satisfied.
Triggering of equipment outside the system (Option with requirements)
NOTE This subclause relates to 4.3.2 q).
The e.c.d. may be designed to transmit triggering signals to equipment outside the fire extinguishing system (triggering of doors, ventilation shut down, plant shut down etc.).
Concerning the transmission paths for triggering signals to equipment outside the system, the requirements of 4.15 and 4.16 shall be satisfied.
Emergency abort device (Option with requirements)
The e.c.d. may provide technical means to connect emergency abort devices.
During the quiescent and activated condition the activation of the emergency abort device shall inhibit the extinguishing signal until the emergency abort device has been deactivated and the e.c.d. has been reset from the activated condition.
NOTE After activation the emergency abort device is latched.
Faults of the transmission path to the emergency abort device shall be recognised and indicated within 2 s and prevent the transmission of the extinguishing signal.
Activation of the emergency abort device shall be indicated visibly and audibly (if audible indication was silenced before) at the e.c.d. The visible indication shall be given at access level 1 by means of a separate light emitting indicator for each flooding zone and shall remain until manually reset.
If an emergency abort function is provided, the e.c.d. shall have at least a common output able to transmit the information of the activation of the emergency abort device.
Control of extended discharge (Option with requirements)
NOTE 1 This subclause relates to 4.3.2 s).
NOTE 2 During the normal flooding time the design quantity of extinguishant is discharged into the flooding zone and the design concentration is built up. In some cases this concentration is to be maintained over a longer time (e.g. 10 min, 20 min). This can be supported by a so called "extended discharge". During the extended discharge flooding time, the concentration is maintained by a small flow of extinguishant through a separate extended discharge pipework into the flooding zone.
The e.c.d. may be designed to control an extended discharge, for instance in the case of low pressure CO2 systems.
If the e.c.d. is intended to control an extended discharge, e.g. in CO2 low pressure systems, the extended discharge flooding time shall be adjustable up to at least 20 min. The setting shall be done in steps of maximum 1 min and is restricted to the access level 3. The adjusted extended discharge flooding time shall be indicated at least at access level 3 (e.g. label).
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4 The set extended discharge flooding time shall remain within deviation limits of ± 10 % of the set value.
5 If the e.c.d. is intended to control an extended discharge, means shall be provided which for test purposes allow the termination of an already running extended discharge flooding time. This shall only be possible by means of a separate manual control at access level 3. The operation shall have no effect on the intended operation of the e.c.d. after this test.
Release of the extinguishing media for selected flooding zones (Option with requirements)
NOTE 1 This subclause relates to 4.3.21).
NOTE 2 In some cases, e.g. selector valves, it can be sensible after having established the released condition in one flooding zone to prevent the release of the extinguishing media for other flooding zones.
The e.c.d. may provide technical means by which, after having established the released condition in one flooding zone, only the output(s) to the actuators of other flooding zones shall be automatically disabled. The disablement shall be indicated as the disabled condition of the flooding zone(s) (see 4.16).
All flooding zones shall be selectable to prevent the release of the extinguishing media.
The selection is restricted to access level 3. The selected combinations shall be identifiable at access level 1,2 or 3.
Received input triggering signals for (a) flooding zone(s), where the release of the extinguishing media for the flooding zone(s) is prevented, shall be indicated as the activated condition of the flooding zone(s) (see 4.9).
The re-enablement of automatically disabled actuators shall only be possible after the e.c.d. has been reset.
Activation of alarm devices with different signals (Option with requirements)
NOTE This subclause relates to 4.3.2 u).
The e.c.d. may provide output(s) to alarm devices with at least two different signals, if the e.c.d. has the facility to delay the extinguishing signal (see 4.17 and 4.20.3 b)).
The signal during the pre-discharge warning time shall be intermittent and the signal for the released condition shall be continuous.
Design requirements
General
The following subclauses describe requirements of the mechanical, electrical and software design.
Compliance of the e.c.d. with this standard cannot be fully verified by functional testing because of the impracticability of testing all possible combinations and of determining long-term reliability. In order that a verification of the design can be achieved, it is necessary for the test organisation to assess the design.
The manufacturer shall declare that the design had been carried out in accordance with an appropriate factory production control system.
Within this factory production control system a set of design rules shall be incorporated and used for the design of hardware, software and software controlled elements of the e.c.d.
Mechanical design
The e.c.d. shall be protected against environmental influences by a cabinet of suitable mechanical strength. The osbinst shicul be classified as at least
IP 30 as specified in EN 60529 for e.c.d. classes A and B, or
IP 54 as specified in EN 60529 for e.c.d. classes C and D.
Manual controls
All manual controls on the e.c.d. shall be clearly labelled to indicate their purpose.
If the e.c.d. has provision for disconnecting or adjusting the main or the standby power source, this shall be possible at access level 3 or 4.
Visible indicators
General
For the indication of the required information either separate light emitting indicators as specified in 5.4.2 or alphanumeric displays as specified in 5.4.3 shall be used (see annex A).
Indications by means of separate light emitting indicators
All compulsory light emitting indicators shall be testable by manual operation at access level 1 or 2.
All light emitting indicators at access level 1 shall be clearly labelled to indicate their purpose.
Labels shall be readable at a distance of 0,8 m at an ambient light intensity between 100 lx and 500 lx.
Indications from the light emitting indicators in 5.4.2.1 and 5.4.2.2 shall be visible at any angle within
22,5 ° from a line with its origin in the centre of the light emitting indicator and perpendicular to its mounting surface at a distance of 3 m at an ambient light intensity up to 500 lx.
Б.4.2.4 Where the same light emitting indicator is used for the indication of fault and disablement of transmission paths fault warning shall be indicated by flashing and disablement by steady lights.
Where flashing indications are used the on/off period shall each be not less than 0,25 s. The frequencies of flash shall be:
for indicators of activated condition, not less than 1 Hz;
for indicators of fault, not less than 0,2 Hz.
Indications by means of alphanumeric displays
Where an alphanumeric display is used to indicate required information additional general light emitting indicators for the “Activated Condition", "Released Condition", "Fault Warning Condition", “Disabled Condition" and "Blocked Condition" shall be provided.
The alphanumeric display should consist at least of a sufficient number of fields to be capable of indicating all released flooding zones simultaneously. If the alphanumeric display does not consist of a sufficient number of fields to be capable of indicating all released flooding zones simultaneously, the released flooding zones shall be indicated by separate light emitting indicators.
For each condition there shall be only one window, in which all of the fields relating to that condition are grouped.
Each field shall be clearly identifiable. If not already included in the displayed information, the purpose of the indication of a field shall be clearly labelled.
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16 characters, where the display of information uses a cross reference to other information to identify the
location;
40 characters, where the display is intended to include the complete information on the location.
At any time during the "Activated Condition" and the "Released Condition" it shall be possible to display suppressed information, which is not currently indicated, by manual operation at access level 1. Reversion to the indication of the released flooding zones shall occur between 15 s and 30 s after the last interrogation.
A window shall be clearly identifiable and distinguishable from other windows. A window may be realised by subdivision of a larger display e.g. a screen. Such a subdivision may be realised either by mechanical separation (frames) or by software (windows).
If an alphanumeric display consists of elements or segments, a failure of a single element or segment shall not affect the correct interpretation of the displayed information.
Where alphanumeric displays are used the angle in which the information can be read relative to a line perpendicular to the mounting surface of the alphanumeric display shall be at least 22,5° viewed from the side, at least 15° viewed from above and at least 15° viewed from below.
The indications from the separate additional general indicators shall be visible in an ambient light intensity up to 500 lx, at any angle up to 22,5° from a line through the indicator perpendicular to its mounting surface at 3 m distance.
Information shown on an alphanumeric display shall be readable at a distance of 0,8 m at an ambient light intensity between 5 lx and 500 lx.
No colour distinction is needed for alphanumeric displays. Where colour distinction is used the same colour shall be used as for light emitting indicators.
Audible indicators
The minimum sound level, measured under anechoic conditions at a distance of 1 m from the cabinet, shall be at least 60 dB(A) for the activated condition and the activation of the emergency hold or abort device and 50 dB(A) for other indications. E.c.d.s equipped with a door have to be checked with the door closed. The signalling device may be the same for all required audible indications.
Electrical design of components
The manufacturer has to certify in writing that all electrical components have been selected for the intended purpose and operate within their ratings when the environmental conditions outside the cabinet of the e.c.d. comply with EN 60721-3-3, class 3k5 for class A or class C e.c.d.s and 3k6 for class В or class D e.c.d.s.
Circuit design
The circuit design has to be such that a fault on any transmission path shall only affect this transmission path and the function of the e.c.d. related to this transmission path. No other transmission path and no other function of the e.c.d. shall be affected.
In any case, a fault on a transmission path as specified in 4.13.1 a) to g) shall not affect the function of more than one flooding zone. Where the room and its false floor are subdivided into two flooding zones, a fault on a transmission path may affect these two flooding zones.
All terminals shall have appropriate power limitation in order to ensure that in case of external short circuits no danger exists because of heat production.
Additional design requirements for software controlled e.c.d.s
General
The e.c.d.s may contain elements which are controlled by software in order to fulfil the requirements of this standard. In this case, the e.c.d.s shall comply with the requirements of this clause, as well as those of clause 5, where relevant to the technology used.
NOTE The following requirements are derived from the requirements for software controlled c.i.e.s (EN 54-2). Changes were implemented, when necessary, to take into account the special functions and use of e.c.d.s.
Software design
In order to ensure the reliability of a software controlled e.c.d. the following requirements for software design shall apply:
the software shall have a modular structure;
the design of the interfaces for manually and automatically generated data shall not permit invalid data to cause an error in the program execution;
the software shall be designed to avoid the occurrence of a deadlock in the program flow.
Program monitoring
NOTE See also annex B.
The execution of the program shall be monitored as under 6.3.2 or 6.3.3. If routines associated with the main functions of the program are not executed, the e.c.d. shall enter the fault warning condition and shall indicate either or both of the following:
