Schindler 3100/3300/6300
J 43402603 / 01
60/269
Copyright © 2017 INVENTIO AG
3.9.1.2
Main Additional Safety Measures with TSD21
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The TSD21 elevator ensures the necessary refuge space (based on EN81-21) in the
headroom and/or in the pit, when a person moves the car in inspection mode.
Before accessing a reduced headroom or pit, the TSD21 lever must be active. The
inspection mode will be blocked, if access has been detected (KNET) and the bolts are
not fully extended (KSR). The activation of this TSD21 lever causes two metal bolts on
both sides of the car structure to extend outwards, until they come into the projection of
the TSD21 buffers. TSD21 buffers are mounted on the guide rails.
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The inspection travel is limited by an additional safety switch acting before the bolts
hit the buffers.
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In addition, the TSD21 elevator blocks PEBO if access is detected.
Access detection is done by checking the use of the triangular lock for manual opening
of the landing door, with a safety switch (KNET).
Upon a manual opening of a landing door, that can give access to the reduced
headroom and/or pit, the TSD21 elevator is stopped, blocking the car and preventing the
elevator to continue further in Normal Mode, when the landing door is closed again.
When a manual opening of a landing door is detected, in order to activate the
Normal mode again, the safety system must be reset with the “RESET” button
(DRZS) in the controller cabinet.
The DRZS has a padlock. When removing the padlock and before performing the reset,
it must be ensured no one is in the shaft.
3.9.2
How to Perform Maintenance on a TSD21 Installation
3.9.2.1
Overview of TSD21 Shaft Access and Exit procedures
For maintenance purpose, the field technician needs to be able to access the car roof
or/to the pit. On a normal elevator, the fitter calls the elevator with a landing call, after
which he sends the car to the correction position and opens the landing door with a
triangular key, to access the car roof or pit. If the car is not yet in the correct position, the
fitter recloses the landing door, and move the car in the correct position, the fitter
reopens the landing door and accesses the car roof or pit.
However, for TSD21 installation this sequence is not possible anymore, the additional
safety measures with TSD21 will be activated after the first manual opening of a
monitored landing door (KENT) and a special sequence for the shaft access and shaft
exit need to be followed. The following tables highlight the main shaft access and exit
procedure steps required for proper use of the TSD21 system.