Dynatech DA-UD Gebrauchs- Und Wartungsanleitung Seite 7

1.5.9. In order to prevent the tripping of the safety gear due to a power supply failure, the retention coils must be
autonomously supplied by an independent supply source.
1.5.10. When carrying out the emergency operation (electrical or manual), the retention coils must be kept powered and
check that the position of the activation means allows the car to be put into motion.
1.5.11. Regardless of what is stated in 1.5.9, energy saving functions like SLEEP or STAND BY operations, switching off
power to the coils, can be used, for which the elevator must be stopped. Before restarting the elevator, the
controller should check with the monitoring means the position of the activation means.
1.5.12. For the release of the safety gear, the reset coil must be powered in synchronicity with the starting of the lift motor,
taking into account that: PRT.83.2.1500/1, the PWM circuit provides the reset power to the coil during only 1500
ms. If it is not possible to reset the elevator with the planned reset cycle, an alternative circuit should be used that
bypasses PWM and power the reset coil at full power for a longer time. In such case the servicing factor (ED) of
the reset coil must be considered and the switching off of the circuit must be timed to prevent the coil from burning
out; PR.83.2.1500/2, a circuit such as the aforementioned should be considered in any case with a timed opening
to prevent damage to the reset coil.
1.5.13. In order to allow the correct performance of the safety gear to be checked, the operation used to the elevator reset
shall not impede the starting in the same direction to that of the safety gear activation.
1.5.14. The basis of the assessment is that of design under Fail Safe condition, which leads the system to the safe
condition (safety gear operated). Durability, stress, and component characterization tests have also been carried
out. Electromechanical fatigue tests have been carried out on samples of the complete system with more than
320,000 connections and disconnections. [Instituto Tecnológico de Aragón, report C / 200673 I 1 (2020.02.27)].
1.5.15. In order to prevent the appearance of faults, a series of actions must be taken both for the design of the integration
of the system and for the maintenance of the installed equipment.:
- The supply for the coils must be protected against electrical fault (short circuit);
- The assembly must be protected against the entry of foreign elements, locate the equipment below the car;
- The assembly shall be accessible to check the existence of dirt or rust and to proceed to its cleaning;
- The set used with each safety gear is recognizable by the mark 'UP', showing the up position on the
assembly frame.
- It is advisable to perform a daily operating test of the system, which can be automated by the controller or
alternatively use the SLEEP or STAND BY function of the controller if available.
1.5.16. Other optional operating and connection indications are found in the operating system instruction manual. The
system must be adapted to the governor and to the elevator controller circuits.
1.5.17. It can be used as a actuation means of the mechanical brake in the pre-triggered stopping system [5.5.2.3] and
[5.7.2.3] of EN 81-21:2022.
Technical annex to certificate ATI /CA021 rev.4
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