GAPOSA M4A Panduan Referensi - Halaman 7

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GAPOSA M4A Panduan Referensi
SAFETY BRAKE SELECTION
GAPOSA offers a selection of 9 safety brakes for roller shutters, each one with a different
torque. The safety brake, made up of anti-oxidation materials, consists of a central body
with a hole in which the rolling shutter shaft is inserted, and is supported by a metal
base. Between the central body and the base you find rubber bearings with a density apt
to compensate any eccentricity of the system.
In order to select the most suitable model for you application, it is necessary to consider
the following characteristics:
• Nominal torque [Nm]: is the reference value to select the most appropriate safety brake
according to the weight of the shutter and the diameter of the drive shaft. Within this
value must fall the nominal torque of the motor that is to be installed.
• Locking torque: is the maximum stress to which the safety brake is subjected when it
blocks the rotation of the shaft.
• Working speed: refers to the maximum number of revolutions at which the safety brake
works as a simple support without functioning as a descent stopper. Within this value
must fall the number of revolutions of the shutter shaft.
• If the safety brake is installed with a chain transmission system , make sure the chain
is not loose. A chain not sufficiently tight causes sudden accelerations and the safety
brake may accidentally block.
Then refer to Tab. A.

INSTALLATION INSTRUCTIONS

This operation is not particularly difficult, but in order to get the best performance from
the safety brake, in accordance with the criteria indicated by the producing company,
the installer should take particular care of some important prescriptions:
1. A check of the safety brake regular working, while the shutter is rotating. Since it is not
possible to simulate a breakage in the transmission, you can make sure of the good
working of the safety brake by listening to the linking caused by the adjustment of
internal components while the shutter moves up and down. If this is clearly heard the
safety brake has passed the working test.
EN
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