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GLOBE RM410 PISTON AIR MOTOR MANUAL| INCLUDING AUXILIARIES | ATEX Certified
Operating Principle Brake
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Specific Condition of Use:
For ATEX it is important that there is no possibility that the brake will
drag during running. This will cause friction and heating up of the brake. Therefor it is important
that the pilot pressure to release the brake is equal to the operating pressure or no pressure. If the
operating pressure is by any reason reduced there will be a risk that the brake starts dragging. To
prevent this situation the brake is executed with a set of pneumatic control valves. One of these
control valves (GLOBE APPV3214) has an adjustable opening pressure. This opening pressure
is set at the factory to the given operating pressure of the motor. These valves make sure that the
pilot pressure to brake is equal to the operating pressure of the motor. If the motor has to run or
is going to run at a lower operating pressure than given by the customer the pneumatic control
valve will automatically be closed. There will be no pilot pressure to the brake and the brake will
be blocked.
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The brake module bolts directly onto the motor mounting face and has exactly the same interface
as the motor As shown on the drawing below, the brake consists of two spring applied shoes
pressed against a central hub. These shoes are released by applying air pressure to the cylinder /
piston assembly. The brake torque can be varied by means of two spring adjusters but it for ATEX
application set by GLOBE to maximum torque which belongs with the operating pressure of the
motor. At this pressure the brake will be fully released. Any unauthorized adjustment will make
ATEX invalid. Changing or adjustment of the valves will make ATEX invalid.
The brake is NOT equiped with a locking device. The braking force is based on
friction and is caused by a friction material which is pushed against the braking
wheel and brake housing. When the load is higher than the rated holding torque
the brake.
STOP
