Seismic detection system

for elevators

система сейсмического обнаружнения

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 purposes of increased reliability and unification the seismic detection system is delivered as a standard kit to be placed inside of electrical cabinet.

Standard composition

of seismic detection system

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

Module type Functions (application features) Recommended amount of units Price
ZET 7150 digital seismic detector measuring and digital processing of vibration acceleration values (m/s²) 3 from 628 USD
ZET 7161 control module, “dry contact” signal formation upon relay module activation;

“Stop” indication in the case of protection system activation

1 from 123 USD
ZET 7173 flash-drive module Loop data recording, storage of the information received from the digital seismic detectors 1 from 183 USD
ZET 7174 interface converter data exchange protocol based on CAN interface;

connection to the PC (in the case if it is necessary to  change activation threshold levels)

1 from 133 USD
Back-up power supply source off-line operation during 24 hrs (min.) 1 from 175 USD
Electrical cabinet for distribution and interconnection of the seismic detection system elements 1 from 348 USD
Assembly installation of digital sensors, control and interface modules inside of electrical cabinet;

layout and connection of the communication cables

1 from 1443 USD

Turn-key system price: from 4321 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.

Seismic detection system based on ZETSENSOR series products can be returned into normal operation mode only manually – the same applies equally to switching the elevator into normal operation mode.

System response time is determined by the period between the moment of the seismic wave reaching the set threshold level and the elevator being switched into the seismic operation mode.


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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