Apart from longevity and quick installation,
special attention was given to safety during operation
of the GTZ55 and GTZ100
garage-door operators.

A special control device was developed
which recognises the power (which varies over
the entire working area) and adjusts it automatically.
Thus, the motor releases only the power which
is really necessary.
If the door meets an obstacle, the
operator stops at once and reverses automatically,
ensuring the highest degree of safety.
The GTZ monitors
the garage unit while stopped as well. If someone
tries to open the door with force, the operator
senses it and counteracts by pushing back with
its full power.