AS 1603.11:2018 pdf download.Automatic fire d etection and alarm systems Part 11: Visual warning devices.
2.6 Countdown timer — optional function
Where countdown timers are used, they shall be linear in operation and meet the requirements of this
document for both display and timing tolerance.
2.7 Ancillary functions — optional
Where additional functions are included, they shall not jeopardize the required functions of the VWD, nor provide incorrect or conflicting information.
Where there are external conncctions to ancillary devices (remote indicators, control relays, etc.), open or short-circuit failures of these connections shall not prevent the correct operation of the VWD.
2.8 Supervision of detachable devices
If a VWD is detachable (i.e. attached to a detachable mounting base), a means shall be provided for a remote system (control and indicating equipment) to detect removal of the device from the base, in order to give a fault signal.
2.9 Environmental classification
VWD shall be classified according to their intended applications and meet the corresponding test parameters given in TahIel.9. when tested in accordance with the test schedule in C1auiL2.
2.10 Flash rate — optional function
Where a VWD has provision for flashing, when flashing in the alarm mode, the flash rate shall be between 0.5 Hz and 1 Hz. The on period shall beat least 50 % of the cycle and the off period at least 0.2 s.
NOTE The maximum off period is calculated by 1/Frequency x 0.5. E.g. for 1 Hz the maximum off is 0.5 s. For 0.5 Hz the maximum off is 1 s.
2.11 Synchronization — optional function
Where a VWD has provision for synchronization with at least one other VWD or VAD, the difference
between synchronized devices shall be less than 0.05 s after a period of 30 mm. NOTE A suitable test is described in AS ISO 7240.23.
If this is provided by means of an interconnecting trigger wire, the maximum number or loading factor and other compatibility information shall be specified in the data required by Clause 6.
A fault in the interconnecting transmission path shall not stop the VWD from operating. In the case of an interconnection fault, it is acceptable for the VWD to illuminate without flashing.AS 1603.11 pdf download.