The UK's largest independent lift control panel manufacturer.

USP Shaft Positioning System

USP 30/100

Since the introduction of the USP shaft positioning system in 2003, Lester Controls, as Schmersal’s official authorised systems integrator, have supplied in excess of 3000 units. This makes them the largest consumer of this system outside its native Germany.

The system works by the transmitter on the lift car inducing an ultrasonic pulse into the wire, which is hung the length of the shaft. A receiver then deciphers the information and, via the “USP” interface located within our control panel, converts the data into analogue signals to suit the processor

The simple installation method, fine tuning and ease of integration
with Lester Controls’ systems all add up to a user friendly positioning
system. With over 1,000 successful installations, the USP is a proven
product backed by Lester Controls & Schmersal’s full weight of
technical “know-how”. The principal behind the USP is a very simple
one; a specially developed wire is suspended from shaft head to pit and
a transmitter is fitted onto the lift cabin which the wire passes through.
A receiver is then installed on the lift at a closed location close to the
motor room.

The car transmitter induces an ultrasonic pulse into the wire under
the instructions of the receiver, via the parallel interface fitted with the Control Panel. These pulses are then interpreted by the receiver and
converted into the distance between the transmitter and receiver. The
Parallel Interface gives an analogue shaft profile that Lester Controls
interprets at 24v DC output.

A full installation fixing kit and instructions are supplied, as well as
a Lester Controls specific “Dummies Guide” set-up and adjustment
procedure. As a stand-alone shaft position system, the USP could
prove an effective replacement for Tape Heads, Inductors and Vanes
etc. on most control systems.

An installation presentation can be viewed on either our or the
Schmersal website: The USP interface connects
via Serial Coms directly to the ALMEGA Control Processor using
CANopen protocol.


  • The USP is available in two kit forms, namely the USP 30 & USP 100. The USP 30 can be used on installations where the travel does not exceed 30m.
  • All other applications should use the USP 100


  • The USP comes complete with an easily
    understandable installation and setup
    manual, which is complemented with a Lester
    Controls’ setup sheet as well
  • Once installation is complete the USP is then
    relatively maintenance free
  • Computer software is available which expands
    the shaft profile into a diagrammatic format
    easily readable on any laptop computer for
    use with a Schmersal P.I

USP 30M Shaft Encoder

USP Kit 30m complete – USPKIT 30COMP
Position System 30m – USP30M 24BS
Parallel Interface – USPPI
SUBD Connector Cable 10m – SUBD10
USP M12 Connector – TRANS5
Can Open Position Systems 30m DTF – USP30M24BSO
USPWire 20m – USPWIRE20
USPWire 25m – USPWIRE25
USPWire 30m – USPWIRE30
USPWire 35m – USPWIRE35
Teaching Button – USPTB

USP 100M Shaft Encoder

USP Kit 100m complete – USPKIT100
Position System 100m – USP100M24BS
Parallel Interface – USPPI
SUBD Connector Cables –
10m SUBD10
15m SUBD15
20m SUBD20
USP M12 Connector – TRANS5
USP Wire 35m – USPWIRE35
USP Wire 65m – USPWIRE65
USP Wire 75m – USPWIRE75
Teaching Button – USPTB

24v Power Supply

24v Omron Power Supply