Connecting The Llt100; Before You Start; Requirements - ABB LLT100 Operating Instructions Manual
Laser level transmitter oi-llt100-en rev. d
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3 Connecting the LLT100
WARNING
Serious damage to health / Risk to life
Avoid contact with leads and terminals. Electrical shock
could result in death or serious injuries.
Do NOT make electrical connections unless the
electrical code designation stamped on the LLT100 data
plate matches the classification of the area in which you
want to install the LLT100. Failure to comply with this
warning can result in fire or explosion.
Use only tools compliant with national insulation
standards, like DIN EN 60900.
Only use non sparking tools when installing the
instrument in hazardous areas.
During installation, completely power down the 4–20 mA
loop for at least 60 seconds, as otherwise it may cause
a permanent error.
3.1 Before you start
– Observe all applicable regulations governing electrical
installation.
– Only qualified and authorized specialists should be charged
with installation, electrical connection, commissioning,
operation, and maintenance of LLT100 instruments. These
specialists hold the necessary qualifications, such as training
or instruction, to operate and maintain devices or systems
in accordance with safety engineering standards regarding
electrical circuits, high pressures, aggressive media, and
adequate safety systems, based on local national standards
such as NEC for USA, National Building Code, etc.
– Connections must be established in a de-energized state.
– While working on the circuit, secure the breaker to prevent
any accidental power-up.
– For continuous installation protection, a double insulation
power supply (5 kV or higher) shall be used for the current
loop.
– The power supply shall be equipped with a short circuit
protection function and an auto restart.
– To avoid injury or property damage in external installations
exposed to lightning, a transient voltage suppression
module or galvanic isolator shall be installed, with proper
grounding, before entering a building with a cable. Refer to
local building code and electrical code for proper practices.
– In an industrial environment where EMIs (electromagnetic
interferences) are extremely present, such as in rock quarries,
mines, or in large chemical plants, ABB recommends the
use of noise filters on the DC power supply to the instrument
and on signal isolators' 4–20 mA output.
– The same power supply can be used for both the 4 – 20 mA
loop and the window heater. A second pair of wires shall be
used to avoid voltage drops exceeding the LLT100 electrical
specifications (see "Typical connections" on page 10).
– Since the LLT100 may form part of a safety chain, we
recommend replacing the device immediately if any defects
are detected.
3.2 Requirements
3.2.1 Power supply
For signal/power connection, use 18 to 22 AWG twisted,
stranded pairs wiring (Ø 0.8 mm
(1500 meters) in length. Longer loops will require larger wires.
The 4 – 20 mA DC output signal and the DC power supply to
the LLT100 are carried by the same pair of wires.
Supply voltage at the instrument terminals must be between
15.5 VDC and 42 VDC. If using 250 Ω for HART, limits are
21 VDC to 42 VDC if there is no other load on the line.
For maximum power supply voltage, refer to the instrument
identification plate.
Avoid routing cables with other electrical cables (with inductive
load, motors, etc.) or near large electrical equipment.
3.2.2 Cables
WARNING
Cables, cable glands, and unused port plugs must
comply with the intended type of protection (e.g. dust
proof, flameproof, etc.) and degree of protection (e.g.
IP66/IP67 [according to IEC EN 60529] or Type 4X
[according to NEMA 250]).
It is the costumers' responsibility to use appropriate
cable glands, screw plugs, lubes and/or sealants
for the cable entry ports. ABB does not assume any
responsibility for non ATEX- or CE-certified cable glands
or adapters that do not meet the above requirements.
The installer assumes responsibility for any other type of
sealing medium used.
In the particular case of explosion proof installations,
remove the temporary plastic caps and close the
unused opening with a plug certified for explosion
containment with appropriate rating.
NOTICE
If you plan on using cable glands that are not supplied
by ABB, please refer to your supplier's data sheet for
proper installation.
Wires and cable glands shall be rated to at least 90°C.
to 0.35 mm
) up to 5000 feet
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OI-LLT100-EN Rev. D | User Guide 7
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