Field wire detecting device and method for fire alarm system

A technology of fire alarm system and control device, which can be used in measuring devices, measuring electricity, alarms, etc., and can solve problems such as short-circuit faults

Active Publication Date: 2015-09-09
SIEMENS SWITZERLAND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the MCU113 monitors that the current on the line exceeds the predetermined

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  • Field wire detecting device and method for fire alarm system
  • Field wire detecting device and method for fire alarm system
  • Field wire detecting device and method for fire alarm system

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Embodiment Construction

[0045] 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.

[0046] 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.

[0047] 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...

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Abstract

The present invention proposes a control device and control method for a fire alarm system, the control device and control method being capable of monitoring an on-line impedance or inter-wire impedance of field wires. The device is connected to a line, with a capacitive element being terminally connected at a far end of the line. The method comprises: sampling at least three output voltages (V 1 , V 2 , V 3 ) of the monitoring power supply at at least three different time points (t 1 , t 2 , t 3 ), respectively, wherein the at least three time points are all before the capacitive element reaches saturation, and the time points include at least three time points which satisfy: t 2 = nt 1 , t 3 = (2n-1)t 1 , where n is an integer greater than 1; and based on the at least three output voltages (V 1 , V 2 , V 3 ), calculating an on-line impedance (Rc) or inter-wire impedance (Rs) of the line.

Description

technical field [0001] The present invention generally relates to detection of field wires (Field wire) of notification equipment (for example, fire alarm device), and more particularly relates to detection of line impedance and inter-line impedance of field wires. Background technique [0002] In a fire alarm system, a field device (Device) such as an audible alarm or a light alarm is connected to the controller (Control Panel) of the fire alarm system via a field wire (Field Wire), or called a line (Line). 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 sch...

Claims

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Application Information

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IPC IPC(8): G01R27/16G01R31/02G01R31/08
CPCG08B29/123G08B25/04G08B29/06
Inventor 朱炳海
Owner SIEMENS SWITZERLAND
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