Unlock instant, AI-driven research and patent intelligence for your innovation.

On-site connection detection method of fire alarm system and corresponding controller

A fire alarm system and controller technology, applied in the direction of alarms, instruments, measuring devices, etc., can solve problems such as short circuit faults between lines

Active Publication Date: 2018-12-18
SIEMENS SWITZERLAND
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the MCU 113 monitors that the current on the line exceeds a predetermined value, it indicates that a short circuit between lines has occurred

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • On-site connection detection method of fire alarm system and corresponding controller
  • On-site connection detection method of fire alarm system and corresponding controller
  • On-site connection detection method of fire alarm system and corresponding controller

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0036] In order to have a clearer understanding of the technical features, purposes and effects of the invention, the specific embodiments of the present invention are now described with reference to the accompanying drawings, in which the same reference numerals represent components with the same or similar structures but the same functions.

[0037] In this article, "schematic" means "serving as an example, example or illustration", and any illustration or implementation described as "schematic" should not be interpreted as a more preferred or more advantageous Technical solutions.

[0038] In order to make the drawing concise, each drawing only schematically shows the parts related to the present invention, and they do not represent the actual structure of the product. In addition, in order to make the drawings concise and easy to understand, in some drawings, only one of the components having the same structure or function is schematically shown, or only one of them is mar...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a field wire detection device for a fire alarm system. A controller for the fire alarm system can monitor line impedance or interline impedance of field wires. The controller is terminated to a field device through a line, and a far end of the line is connected to a diode. The controller can alternatively apply at least two different monitoring power supply voltages to the line. The controller calculates the line impedance through reading sampled values of monitoring current under the different monitoring power supply voltages. Optionally, the controller further provides a third monitoring power supply voltage, wherein the third monitoring power supply voltage is equal to or less than positive turn-on voltage of the terminated diode, and interline impedance of the line is calculated through reading monitoring current on the line when a third monitoring power supply supplies power.

Description

technical field [0001] The present invention generally relates to detection of field wires of notification equipment (for example, fire alarm devices), and in particular to detection of line impedance and inter-line impedance of field wires. Background technique [0002] In a fire alarm system, field devices such as sound alarms or light alarms are connected to the control panel of the fire alarm system via field wires, or lines. The controller (Control Panel) can provide driving current to each field device through this line, so that it can sound and / or flash alarm. However, field wiring may be disconnected or short-circuited due to wear and tear caused by careless installation or long-term use. The current safety standards generally require a relatively accurate judgment of line break or line break faults, that is, require immediate reporting once a fault is detected. [0003] figure 1 A schematic diagram of an existing fire alarm system 100 is exemplarily shown. Such ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G08B29/06G01R27/08
Inventor U·克斯特利朱炳海逄红
Owner SIEMENS SWITZERLAND