Liquid Controls HML4-F1 - LCMag User Manual
Page 7
HML4-F1
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GROUNDING INSTRUCTIONS
ELECTRICAL CONNECTIONS
ALWAYS ensure that the converter and the sensor are grounded (earthed) correctly. The
grounding of the sensor and converter ensures that the equipment and liquid are
equipotential.
CONVERTER POWER SUPPLY
Before connecting the power supply, verify that the
mains voltage is within the limits indicated on data
plate.
ATTENTION: the converters on dc power supply line
are not protected against the inversions of polarity.
For the connections use only approved conductors, with
fire-proof properties, whose section varies from
0.25mm
2
to 2.50mm
2
, based on distance/power;
additionally fix the power supply wires with a additional
fastening system located close to the terminal.
The power supply line must be equipped with an
external protection for overload current (fuse or
automatic line breaker).
Provide in close proximity the converter a circuit
breaker easily accessible for the operator and clearly
identified; whose symbols must conform to the
electrical safety and local electrical requirements.
Ensure that the component complies with the requirements of the standard for
electrical safety distance.
Check chemical compatibility of materials used in the connection security systems in
order to minimize electrochemical corrosion.
The sensor, hardwired inputs and outputs are connected to the converter through a
terminal blocks located inside the converter.
To locate terminal blocks loosen the 2 covers, front and back. The terminal block is
the hardwire connection of the converter to external equipment, including the
sensor.
The following pages give informations on the terminal block numbering, and the
respective connecting of the sensor cables, and inputs/outputs.