Siemens SITRANS LC300 Mise En Service Rapide page 8

Wiring
Signal Amplifier/Power Supply

WARNINGS:
• Check the device nameplate and process device tag to verify the approval rating.
• Use appropriate conduit seals to maintain IP or NEMA rating.
SITRANS LC300 uses a switched power supply circuit that makes the most efficient use of the
available power present on the terminals. If the signal current is low (4 mA), the terminal
voltage will increase due to a voltage drop of other components in the loop, and if the signal
current is high (20 mA), the terminal voltage will decrease.
Loosen the lid clip and remove the enclosure cover to access connectors and electronics..
with safety barrier without safety barrier
white (S) orange (S)
black (O) black (O)
red (+)
red (+)
for factory software
update use only
menu/function
selector
Connecting the LC300
1. Loosen the retaining lid clip and remove the enclosure cover.
2. Loosen the cable gland and thread the cable through it.
3. Connect the power/signal conductor wires to the current-loop terminal blocks (any
polarity). The loop voltage must be between 12 and 30 V DC.
4. Ground the enclosure by connecting the housing and the process connection with
either the stilling well and/or the tank wall, using the ground lug near the bottom of
the housing.
5. Check that all connections are secure.
6. Replace enclosure cover and tighten retaining lid clip.
Page EN-6 SITRANS LC300 – QUICK START MANUAL
All manuals and user guides at all-guides.com
up / + button
4-20 mA (2-wire)
current-loop
measurement
signal (non
polarity
sensitive)
down / - button
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