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The function of lifts is to transport persons and goods in pri-
vate and commercial buildings. Hydraulic lifts are frequently
used for low lifting heights, otherwise counterbalanced cable CPU + tel.
lifts are used. Passenger lifts have a speed of about 1 m/s and controller
higher (medium-sized buildings / multi-storey buildings up
to 8 m/s and next generation of multi-storey buildings up to
17 m/s). Goods lifts have transportation capacities up to
5 tonnes.

Lifts fulfil several functions such as:
¨ Smooth starting and stopping controlled by a frequency
converter
¨ Traffic optimisation measures (e.g. no stop in case of full
load, priority travels, behaviour of lifts in case of fire)
¨ Energy saving function (cabin lighting and ventilator are
switched off in case of empty travels or standstill) contr. supply FC
¨ Power supply function (the kinetic energy generated by
goods transport to the ground floor and empty travels to
the top floors is fed into the power supply system)
These functions can only be fulfilled by means of highly sensi-
tive electronic systems.

Lift manufacturers take various measures to reduce injection
into the lift cabling / technology to an acceptable level. Be it
shielded metallic distribution boards or the type of cable rout-
ing or cable – all these measures cannot prevent that con- weight
ducted transients damage the lift.

The peripheral units of lifts such as floor panels or floor dis-
plays are connected to prewired plug-in connecting cables.
Thus, surge protective devices are only required for the mains
connection, the telephone line and the fire alarm system, if any
(Figure 9.26.1).
Use Type Part No.
TN-S system DG M TNS 275 952 400
TT system DG M TT 275 952 310
Telephone U K0 / BXT ML2 BD 180 920 247
extension + BXT BAS 920 300
Fire control panel BXT ML2 BE S 24 920 224
¨ PLC + BXT BAS 920 300
Figure 9.26.1 Surge protective devices for a lift

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