1S9STOEN_26-5-17_ADL300_STO_STO Pag. 28/30
7.3 Lift Application Design supporting contactor-less car stop
Figure 14 ADL300 Lift system reference design to use onto the motor.
Figure 14 is a Lift reference design to be used to implement a Lift System according to EN81-20
5.9.2.5.3 d) using no contactors and safety integrated function STO (EN61800-5-2- SIL3) instead
of 2 contactors.
In order to fulfil the contactor-less design one of the relays must be mandatorily configured as
Digital Input Monitor of ENHW (inverted) so that its status directly links to ENABLE signal status.
In Figure 14 the status DRIVE OK plays the role of inverted ENHW monitor (the current flows in
both relays when car is stopped).
Generally speaking the feedback signal must always be monitored by the SYSTEM CONTROL
UNIT either parallel independently or in series.
Requirements to comply to reference design and EN81-20 5.9.2.5.3 d) are:
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