Seismic detection system

for elevators

Seismic detection system for elevators

Seismic detection system based on ZETSENSOR series products has been developed for prevention of risks relating to use, maintenance, control and emergency operation of elevators that have been exposed to seismic impacts.

For the purpose of increased reliability and unification the seismic detection system is delivered as a standard kit placed inside of compact leak-proof casing.

Standard composition

of seismic detection system

Standard composition of seismic detection system based on ZETSENSOR products includes the following:

Module type Designation (application environment) Recommended quantity Price
ZET 7152-N (digital triaxial seismic sensor)  measurement and digital processing of vibration acceleration physical values (m/s²) 1 from 1082 USD
ZET 7160 digital port produces signal for relay module activation 1 from 123 USD
ZET 7161 dry control module activation of “Stop” indication informing the user of security system activation 1 from 123 USD
ZET 7173 flash-drive module loop-recording and storage of data obtained by digital seismic sensors 1 from 193 USD
ZET 7174 interface converter support of data exchange protocol between the devices connected to CAN data transfer interface;

connection to PC, changing the threshold activation values

1 from 267 USD
Leak-proof casing it is used for system elements storage and interconnection 1 from 686 USD
Assembly, settings and testing installation of digital sensors, control and interface modules inside of a leak-proof casing;

cables layout and connecttion;
factory testing, EMC and environmental impact testing,

1 from 1109 USD

Turn-key system price: from 3583 USD

The system may also be equipped with primary wave detection system if it is used for control of elevators having balancing weight and side counterweight.

Technical specifications

of seismic detection system

Seismic detection system
Acceleration detection by three planes
Seismic threshold level of activation ≤ 1 m/s2 for each of the possible direction vectors
Frequency characteristics 0,5 – 10 Hz
System response time ≤ 3 s
Automated verification of the system ≤ 24 h
Back-up power supply system ≥ 24 h
System set-back to initial state in manual mode
Primary seismic wave detection system
Primary wave threshold level ≤ 0,15 m/s2
Detection direction vertical
Frequency characteristic 1 – 10 Hz

In the case if system is going to be used for elevator control purposes only, in can be placed in the elevator pit of the lowest elevator of the building. In the case if any other vibration sources are possible, the seismic detection system can be placed in other suitable locations.

In the case of interface connection failure between seismic detection and elevator control systems, the elevator control system will activate seismic mode of the elevator.

Operating principles

of seismic detection systems

Schematic structure of seismic protection cabinet as well elements layout scheme are shown in the figures. Indicators “In operation” and “Stop” are located at the door of the seismic protection cabinet.

Upon activation of the operation mode, digital seismic detectors installed in the directions of «Х» «Y» and «Z» (Х is aligned with horizontal plane of elevator’s mounting surface,  Y is transverse to horizontal plane of elevator’s mounting surface,  Z axis has vertical direction) start recording the acceleration values of the corresponding axes.

The recorded signals are transmitted to ZET 7173 flash module in digital format as well as to the “dry contact” of ZET 7161.

“Dry contact” ZET 7161 control module performs monitoring of the controlled levels for each of the measuring axes (X, Y and Z). In the case if the set acceleration threshold levels are exceeded, there is formed a signal, which is transferred to the relay. The relay, in its turn, produces the “dry contact” signal for the actuator. The “Stop” indicator is activated simultaneously with the “dry contact” signal formation.

Структурная схема системы сейсмической защиты лифта

Installation

of the seismic protection cabinet

The seismic protection cabinet should be installed on the bearing structures of the building (walls, columns, etc) located in direct vicinity to the controlled area. The installation is performed using the standard mounting brackets (included into delivery scope of the cabinet) by means of anchor clamping, so that to prevent looseness at the mounting points.

Connection of power supply cables and “dry contact” signal transfer cable to the actuator as well as grounding wire installation should be performed in accordance with the electrical safety requirements.

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