13.2.6.6 Pre-triggered Stopping System
There is an upper pre-triggered stopping system for the shaft head
and a lower pre-triggered stopping for the shaft pit:
The upper pre-triggered stopping system trips if “there is EN81-21-state” AND
“actual position is higher than the upper stopping system limit“
The lower pre-triggered stopping system trips if “there is EN81-21-state” AND
“actual position is lower than the lower stopping system limit“.
These safety functions are only active if they are “enabled”.
They may be “disabled” in case there is no short head/pit.
For closer explanation short head/head clearance resp. short pit/pit clearance and for calculation of positions of
upper/lower stopping system limits refer to Table 21 & Table 22 in chapter 14.1. Refer also to 13.2.8.
If upper or lower pre-triggered stopping system trips, eSGC and OC will open (SR1/2 are already open due to
EN81-21-state). After tripping of pre-triggered stopping system, the actuators are kept open – even after power
cycle - until the safety function is reset by CANopen-reset. So, it is not possible to move the car with the inspec-
tion pod after the pre-triggered stopping system has tripped.
In order to avoid the situation that a man on the roof or in the pit is trapped when approaching the shaft end in
inspection travel, the upper/lower inspection limit switches should be able to stop the car before the upper/lower
pre-triggered stropping system is trips. The user should take this into account when setting the offsets of the in-
spection limit switches by CANopen 14.2.
If upper or lower pre-triggered stopping system is enabled (or both enabled), eSGC must be available, enabled
and installed due to 10.4.8. Concerning this safety function, it is arbitrary if eSGC drives directly an electron-
ic safety gear, or the blocking device of a speed governor (remote triggering of speed governor).
13.2.6.7 Actuator and Braking element for pre-triggered stopping system
The braking element for pre-triggered stopping system may be:
An electronic trigger-able safety gear
A conventional safety gear tripped by speed governor. This speed governor again is tripped by a block-
ing device (remote tripping) connected to eSGC.
The tripping coil of this braking element must be connected to the eSGC-actuator.
13.2.6.8 Inspection Limit Switches
Inspection limit switches operate the OC-contact.
They are only active in EN81-21-state and they are direction dependent:
The upper inspection limit switch (OC) opens, if there is an “EN81-21-state” AND
“actual position is higher than the upper inspection limit“, AND “there is actual no
demand of a travel in DOWN-direction” (by inspection direction buttons).
Refer also to Table 14 (see next page).
The lower inspection limit switch (OC) opens if there is an “EN81-21-state” AND
“actual position is lower than the lower inspection limit“, AND “there is actual no
demand of a travel in UP-direction” (by inspection direction buttons).
Refer also to Table 14 and 15 on the next page.
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