ABB LST300 Series Instrucciones de funcionamiento e instalación

—

T &

S | INSTRUCTION

LST300_Terminals Description

- with Wiring Suggestions

Electrical connection

Make sure no power supply for LST300 before

installation.

Engineer must electrostatic discharge or use a

wristband before connecting the cable to the

LST300.

Ensure that the power supply is within the range

(12-42 V DC)

When the terminal cover of LST300 is opened, the

transmitter should be protected from dust and

moisture.

Figure 1. Cable Connection Area

Hot swappable power

supply is not recommended

Hot swap power supply (4 -

20 mA HART) is not

recommend for LST300.

Please turn off the power

supply before connecting the

LST300 to the power supply.

Warning

–

Physical

Injury

Electrostatic discharge

will cause material

damage

Open caps do not provide

contact protection, which

means touching conductive

devices can damage

electronic devices

(sometimes beyond repair)

due to electrostatic

discharge. Do not touch

conductive devices.

Attention

Property

Loss

According to IEC 61000-4-2，the contact ESD

protection voltage of LST300 connectors is 4 kV

while the air ESD protection voltage is 8 kV. ABB

strongly recommends using wristbands or

electrostatic discharge before connecting cables

to LST300。

Cable connection area

The wire is mounted on LST300 with a 1/2-14 NPT

or M20 x 1.5 cable sealing sleeve. In order to

maintain the NEMA 4X and IP 66/67 of the

transmitter in the protection level, proper sealant

(1/2in. NPT or M20 x 1.5 nut thread) should be

coated on the thread of the cable sealing sleeve

before the sealing sleeve is screwed into the outer

covering.

When installing LST300

measurement system in

dangerous area, all national

standards and specifications

in installation instructions

must be met, and specified

cable sealing sleeve must be

used.

Danger

Serious

Damage to

Health/Life

-Do not tighten the end

cap when the cable seal

sleeve is tightened.

-Only a single cable is worn

in the cable sealing sleeve.

Wearing multiple cables

will affect the entry

protection performance of

the transmitter.

-After terminal connection,

make sure that the

terminal cover is

tightened.

Attention

Property

Loss

Attention

Important

Matters

Before installing the

transmitter in dangerous area,

the red plug must be

removed. The product has not

passed the explosion-proof

certification.

Figure 2. Terminals Introduction

a Positive pole of power supply (+)

b Negative pole of power supply (+)

c Expansion table, short connection with negative pole in

normal use (Ext)

DC power supply

As shown in Fig. 1, the LST300 is operated by a

DC power supply connected to the terminal.

-First open the blind cover to connect the

cable.

-Power supply voltage is 12 - 42 V DC, no

surge protection. Power supply voltage is

12 - 42 V DC when the terminal of

negative pole and expansion meter is

short connected, surge protection.

-To better prevent electromagnetic

interference, twisted pair cable is

recommended.

Analog output

The LST300 has a 4-20 mA analog output for

transmitting measurements and alarms.

-20 mA output and power input are

transmitted on the same wire.

-The output current is a process variable

under normal conditions. It can also be

used as fault protection or as a fixed

value to indicate the alarm situation.

-Low alarm value can be configured in the

range of 3.5 mA - 3.6 mA.

-The high alarm value can be configured in

the range of 21 mA - 22.6 mA.

-The refresh frequency of 4 - 20 mA output is

0.2 seconds.

HART Communication

HART protocol is used for digital communication

between process control system/PC, handheld

terminal equipment and LST300. It can be used to

send all equipment and measurement point

parameters from transmitter to process control

system or PC.

It also provides a way to reconfigure the

transmitter. Digital communication utilizes

alternating current (4 - 20 mA) superimposed on

analog output, without affecting any instrument

connected to the output.

-HART communication and power are

transmitted on the same cable. No

additional cables are required.

-HART communication requires an

additional resistor.

-The minimum resistance of the resistor is

250 ohms. Resistors on power lines can

cause voltage drop, which should be

considered to ensure that the supply

voltage for LST300 is higher than the

minimum rated input voltage.

-The baud rate of HART communication is

1200.

Ground Connection

The LST300 needs to be grounded at the terminals,

as shown in Fig. 2.

-LST300 has two ground connectors (PE).

Effective grounding connection is needed

to achieve optimal EMC protection.

-If LST300 is used in hazardous

environments (Zone 1 and Zone 1 and Zone

2), all grounding must comply with

explosion-proof requirements.

Terminal connection example

Fig. 3 Electrical Connection - HART Version

1. Power Supply

2. Remote Display

3. Handheld Terminal Equipment

4. External grounding connection

5. Internal grounding connection

6. Cable entrance

Explosion-proof transmitters

must be repaired by the

manufacturer or approved by

qualified technical experts after

repair. Please observe the

relevant safety precautions

before, during and after the

repair work.

Warning

LST300

-Te rminasl Description

-with Wiring Suggestions-EN

Rev.

Wiring

Follow the following steps to connect the

transmitter:

1. Remove the cover on one of the two electrical

connection ports on the upper sides of the

transmitter housing.

2. Install various adapters and bushings on the

inch NPT internal threads of connection ports, if

necessary, to conform to factory wiring (conduit)

standards.

3. Remove the cover on the side of the field

terminal.

For explosion-proof/fire-proof installation, the

transmitter cover shall not be removed when the

power supply is connected to the device.

4. Pass the cable through the open port. Connect

the positive lead to the'+'terminal and the

negative lead to the'-' terminal.

Do not connect the power

supply to the test terminal,

otherwise the test diode in

the test connection will be

damaged.

Attention

Important

Matters

5. Block and seal electrical ports. Seal these

openings after installation to prevent rainwater

and corrosive steam and gas from entering the

interior.

6. Install wiring with dripping ring whenever

possible. When installing the drip ring, the

bottom should be lower than the conductor pipe

connector and the transmitter housing.

7. Rotate after installing the cover, so that the O-

ring is loaded into the shell, and then continue to

tighten manually until the metal part of the cover

contacts with the metal part of the shell.

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