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Monitoring signal lightning protection device LFD-RS485/4Category:Monitoring signal lightning protection device

Introduction:The control signal lightning protection device is mainly used for lightning (overvoltage) protection of equipment along the low-voltage control signal line.

Description

一、Product Usage

The control signal lightning protection device is mainly used for lightning (overvoltage) protection of equipment along the low-voltage control signal line. It is widely used in financial systems, telecommunications systems, transportation systems, petrochemical control systems, such as various data transmission lines, monitoring control lines, Instrumentation signal lines, etc.


二、Features

○ Large flow capacity and multi-level protection;

○ The core components adopt internationally renowned brands with superior performance;

○ Low insertion loss to ensure smooth circuit;

○ Built-in fast semiconductor protection device, fast response speed, low residual voltage;

○ Energy saving, environmental protection, easy to install, suitable for various standard interface types;

○ The standing wave coefficient is small and the working frequency range is wide.


Technical Parameters


ModelLFD-RS485/2LFD-RS485/4
Rated voltage Un5V
Maximum continuous operating voltage Uc6V
Nominal flow capacity(8/20μs) In             5KA
Maximum flow capacity(8/20μs)Imax10KA
Voltage protection level(1KV/Isn时)Up≤10V
Response time  Ta≤1ns
Insertion loss  Ae≤ 0.5dB
Working temperature zone-40℃…+80℃
Transmission rate2M bps
Interface formScrew terminal
Installation method2P terminal, in series
Protection circuitSingle way
Shell materialAluminum alloy


1. Before connecting the lightning arrester to the system, check the grounding resistance of the grounding grid, which should meet the requirements of the specification.


2. Connect the lightning arrester to the front end of the protected equipment, and it must be connected reliably.


3. Connect the ground wire of the lightning arrester to the protective ground bus of the equipment room as short as possible. The grounding must be reliable. The grounding wire should be short, thick, and straight to reduce the influence of distributed inductance on lightning discharge; when installing the grounding wire, disconnect the equipment to avoid damage to the equipment due to the introduction of strong currents such as electric welding from the grounding wire.


Installation, use and maintenance

1. Installation instructions


2. Matters needing attention


3. There are input (IN) and output (OUT) signs on the lightning arrester, and the output terminal is connected to the protected equipment, do not connect it reversely. Otherwise, the lightning arrester will be damaged and the equipment will not be protected. During installation, the lines at both ends must be laid separately and cannot be tied together to prevent secondary induction.

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