PHD-22HF-2828

Overview

The base plate mounted isolated safety barrier PHD-11HF-2828 transmits the input signals from switch contacts or proximity switches in the hazardous area to the safe area transistor outputs via the safety barrier isolation. Line fault detection is via a separate relay output (optional) and is indicated by an LED on the top of the module. Switches on the module are used to select the phase of the channel and whether the line fault detection function is required.

The product requires a separate power supply with triple isolation for power, input and output.

Line Fault Detection (LFD)

Line Fault Detection (LFD) is a user-selectable switch on the top of the module and is indicated by an LED. If a line fault is detected, the line fault relay is closed and the channel output relay is disconnected. Short circuit alarm (SC) for field input current >7mA; open circuit alarm (LB) for field input current <0.1mA; switch contact input; 22kΩ resistor must be connected in parallel at both ends of the switch for line fault detection (e.g., switch contact II in the wiring diagram).

Main technical parameters

 

Use of the environment

1. The surrounding environment shall not have strong vibration, shock and large currents and sparks and other electromagnetic induction effects, the air should not contain chromium, nickel, silver plating corrosive media, should not contain flammable, explosive substances.
2. Relative humidity: 10%～95%RH without condensation.
3. Operating temperature: -20℃～+60℃; Storage temperature: -40℃~+80℃.
4. Altitude：≤3500m

 

Overall dimension

Wiring diagram

Terminal definition

 

Wiring

1. Meter wiring adopts removable spring-type terminals, easy to use. The upper end of the instrument is intrinsically safe (blue plug), which leads to the signal terminal of the hazardous side; the lower end of the instrument is non-intrinsically safe, which is directly plugged into the base plate, and is supplied with power uniformly through the sockets and wiring on the base plate and leads to the signal terminal of the safe side;
2. Intrinsically safe side of the wiring should be selected with blue marking intrinsically safe wire, wire soft copper cross-sectional area must be greater than 0.5mm², insulation strength should be greater than 500V;
3. Isolated safety fence intrinsically safe side and non-intrinsically safe side of the wiring conductor in the sink should be laid separately, each using a protective sleeve;
4. The bare length of the wire is about 10mm, if the soft line also need to install metal size >10mm cold pressure head, hard line is not required. The wire can be directly inserted into the wiring hole without a screwdriver.

Installation

Isolated safety barriers should be installed in a safe place, and also comply with
GB3836.13-2013: ""Explosive atmospheres—Part 13: Equipment repair, overhaul and reclamation""，
GB/T3836.15-2017: ""Explosive atmospheres—Part 15: Electrical installations design ,selection and erection"", GBT3836.16-2017: ""Explosive atmospheres―Part 16: Electrical installations inspection and maintenance"", GB/T3836.18-2017: ""Explosive atmospheres—Part 18: Intrinsically safe electrical systems"", GB15577-2018: ""Safety regulations for dust explosion prevention and protection"",
and GB50257-2014: ""Code for construction and acceptance of electric equipment on fire and explosion hazard electrical equipment installation engineering".

Disassembly

1. Pull out the instrument from the socket of the base plate upwards as follows:
2. When separating the wires on the terminals, please insert a standard screwdriver into the groove of the orange operation position and push it inward, then pull the wires out of the wiring hole.

 

Maintenance

1. Before power-on commissioning, you must check again whether the model and explosion-proof grade of the isolated safety barrier is consistent with the design and use of the environment, whether the wiring between the safety side and the hazardous side is correct, and whether the polarity of the power supply and signal is correct;
2. Strictly forbidden to use megohmmeter to test the insulation between the terminals of the isolated safety barrier. If you want to check the insulation of the system line, you should first disconnect all the isolated safety barrier wiring, otherwise it will cause the internal fast fuse blown;
3. Products are strictly inspected and quality controlled before shipment, if you find use of abnormalities, please contact your nearest agent or call the technical support hotline;
4. Six years from the date of shipment, the product in the course of normal use of the quality problems arising from us free of charge to solve.

 

Intrinsically safe explosion-proof circuit system

Isolated safety barriers and field intrinsically safe instrumentation connected to form an intrinsically safe explosion-proof circuit (intrinsically safe circuit) system must be confirmed before use:
1. The explosion-proof grade of the field intrinsically safe instrument should be in line with the use of the environment, and it should be the instrument which has been certified by the state-authorized explosion-proof product certification body and has obtained the explosion-proof certificate of conformity.
2. Isolated safety barriers and on-site intrinsically safe instrumentation between the respective certification parameters are clear, and in line with GB/T 3836.15-2017, such as the requirements of the 12th 12.2.5.
3. If any of these parameters are unclear and need to constitute an intrinsically safe circuit system, they must be confirmed by a state-authorized explosion-proof product certification body.