Digital self-test adapter unit
DST™ is a unique, fully automatic, independent, self-testing module that complies with the requirements of EN50172:2005 and the forthcoming International Standard for automatic testing devices, PrEN62034. Unlike many other devices, DST™ is suitable for incorporation into virtually and NIckel Cadmium, Nickel Metal Hydride or sealed lead acid battery powered self-contained emergency lighting luminaire.
DST™ is
flexible and
can be specified to be included in virtually all of the self-contained
luminaires available from SPEL,
including all conversion kits and is ideally suited to retrofitting even
when non-SPEL conversion
units have been installed.
The DST™ is
thorough and carries out the monthly, six monthly and yearly test
regime contained within EN50172:2005 without the need for manual intervention.
When the unit detects a fault condition it provides both a visual and an
audible alarm indication (if not requirement, the audible alarm can be simply
disabled when the DST™ is
commissioned).
DST™ 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 DST™ 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,
DST™
simply carries on from the point at which power failed.
On
initial power up the DST'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.
*If
a fault is detected the sounder will enter a cycle where it emits an
optional audible alarm, it will then sound every 10 seconds until 4 hours
have elapsed and if during this time it has not been reset or the test
reinitiated the sound alarm will repeat the alarm cycle. A single bleep
only will be emitted during manually initiated test.
