The ultrasonic position system USP uses a non-contact
operating principle to position lift cabins. This principle is not based on conventional switching technology or
common encoder systems and the USP is cost-efficient because of its simple design.
This system is very technically advanced and is able to
communicate with the very latest control systems.
Magnetic reed switches are often used to replace
mechanically actuated limit switches with plungers, roller and turning levers and as important connecting element
for non-contact limit switches. In the elevator industry, magnetic reed switches are used for positioning and
control.
They are preferably used where mechanically actuated limit switches no longer function satisfactorily
due to unfavourable operating conditions such as high or low start-up speeds, high switching frequencies,
strong dust or dirt influence, high humidity, chemical atmospheres or large fluctuations in operation intervals.
Position switches with safety function are suitable for
a wide range of applications in lift industry. They are especially used, where safety and positioning accuracy
are of paramount importance, e.g. at the terminus, at the safety catch device or at the speed limiter.
All position switches with safety function have a
positive link between the actuator and the positive break NC contact. The switches are available with two
different switching systems: snap action (Z) and slow action (T). The protection class of all series is IP 54 up
to IP 67. The metal or thermoplastic enclosures are available in two different standard sizes and they are highly
resistant to oil and fuel.
The door contacts with positive break of the AZ series
are available in ten different versions so that a suitable contact for monitoring the door position or the
locking mechanism (hook bar) is available for all types of elevators.
They are tested and certified in accordance with the
European and American standards.
Door locking devices with and without certified locking
device The lift door locking devices of the AV series are used for monitoring and locking 1- and 2-leaf lift
landing doors. These safety locking devices meet the requirements of the Lift Directive 95/16/CE and of EN 81-1.
The door locking devices are available with light-metal
die-cast and thermoplastic enclosure, with one or two locking elements, with rightside or left-side version,
with lever, pull strap or built-in bearing blocks.
Floor and fine adjustment switches can be used to
achieve an accurate positioning of the car in the lift shaft. Considering the use of new technologies
(e.g. USP, position and magnetic switches) for lift positioning, the floor and fine adjustment switches today are
almost exclusively utilised as spare part.
A proximity switch is a device which causes a switching
action without physical contact. Proximity switches respond to targets that come within the active range of their
generated sensing fields.
These units are completely self-contained, and house a field generator, amplifier, and
other necessary circuitry to accomplish electronic switching.
