GAPOSA M30A Reference Manual - Page 7

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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.