Applications & Description
When a smoke or fire curtain is required to deploy in an emergency
situation it is probable that the mains supply to the control panel may
have already failed and that the cables linking the curtains to the
control panel might become damaged. Under these circumstances with no
power available the curtain will have to deploy by gravity. For this
reason the EAV/BLE SD60 and FC240 systems are always deployed by
gravity, every time the system is tested it is a 100% confirmation of
the fail safe operation of the system.
A test in which a curtain is
powered down under normal test conditions from either mains power or
the battery supply is only proving that it can deploy when powered.
This does not confirm an ability to fail safe.
SD60 and FC240 are
gravity fail safe Automatic Curtain systems utilising the latest in
electronic technology. The systems meet the requirements of British,
European & American standards, a list of which can be seen in this
catalogue. All BLE smoke curtain systems are manufactured in accordance
with our BS EN ISO 9001 certification.
Operation
Under normal conditions the curtain is retracted in the head box and
is held in position by the electronics contained within a remote
enclosure mounted on the motor end of the box. The bottom bar will be
resting against the under side of the box or below the box if a
stopping bar is installed, the stopping bar will then rest against the
box. In the event of a fire condition or operation of the test key
switch the group control panel removes the power to the curtain motors.
The curtain descends in a controlled manner under the power of gravity
and stops in the lower position when all the fabric is unwound from the
roller. When the signal is reset the group control panel re connects
the power to the motors which will retract the curtains to the up
position.
Should the mains power fail to the group control panel the supply is
automatically switched to the integral standby battery. The curtain
remains in the retracted position for approximately 3 hours. The
curtain will remain fully operational until the battery low voltage cut
off reads a voltage less than 85% of the nominal, the curtains will
then descend under the power of gravity to the operational position.
(insert pics from PDF)
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