Emergency lighting

Digital self-test - DST™

Projection Lighting's new digital self-test adaptor, DSTT is a unique, fully automatic, independent, self-testing module that complies with requirements of BS5266 and the forthcoming international standard for automatic testing devices, IEC62034 and unlike many is suitable for incorporation into virtually any nickel cadmium, nickel metal hydride S.L.A battery powered self-contained emergency lighting luminaire.

The Projection Lighting DSTT is flexible and can be specified to be included in virtually all of the self-contained luminaires available from Projection Lighting including all conversion kits and is ideally suited to retro-fitting even when non-Projection Lighting conversion units have been installed.

The DSTT is thorough and carries out the monthly, six monthly and yearly test regime contained with BS5266 without need for manual intervention. When the unit detects a fault condition it provides both a visual and an audible alarm indication (if not required, the audible alarm can be simply disabled when the DSTT is commissioned).

DSTT is reliable and even when it has failed its associated luminaire for duration or light output discrepancies, it will still allow the luminaire to operate to the best of its ability in its emergency mode.

Additionally, the DSTT has a non-volatile memory so if the power fails the clock is suspended but the test sequence remains unaltered. When the mains power is restored DSTT simply carry on from the point at which power failed.

On initial power up the DSTT's intelligence allows it to enter a battery pre-conditioning mode to ensure the batteries are in a suitable condition to supply sufficient power for emergency operation. Testing, initiation and clock resetting are carried out via a single discrete push button.