ABB LST300 Series Instrucciones de funcionamiento e instalación
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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.
A
06
.
2
0
1
9
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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