Novel system puts elevator cabins on the spot
A
Schmersal UK product story
Edited by the Engineeringtalk editorial team
Feb 22, 2002
Schmersal UK has developed an all-new noncontact operating principle for positioning elevator cabins.
Schmersal UK has developed an all-new noncontact operating principle for positioning elevator cabins.
The new system eliminates conventional switching technology and common encoder systems and can communicate with the latest control systems.
The system, called USP, is reckoned to be a cost-efficient solution for travel heights from 30 to 130m, and boasts position accuracy of +/-1mm at speeds up to 8m/s.
Installation time for the system is about an hour.
The positioning system consists of a transmitter mounted on the cabin and a receiver that can be fitted to either the shaft pit or shaft head.
Transmitter and receiver are linked by a specially designed signal wire that has one damper fitted at the receiver end and another fixed at the bottom end of the shaft.
Swing protection units are also fitted.
The system operates by sending a trigger impulse from the receiver through the travel cable to the transmitter, which then generates a noncontact ultrasonic pulse in the signal wire that expands in both directions towards shaft pit and shaft head.
The receiver's microprocessor system converts the mechanical pulse into an electronic positioning value that can be detected as serial data information by the control unit.
The pulse is then neutralised by both dampers.
The positioning value can be recalled at any time, even after a power cut.
(This was Engineeringtalk's Top Story on 21 February 2002).
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