Tecfluid CU Series - Manual (Page 6)

6
2.1 Electrical connection
For the electrical connection, the CU100 converter has four terminal strips. To help in the
wiring of the equipment, the description of the terminals is marked on the printed circuit
next to each terminal strip.
For the electrical installation it is recommended to use multiple conductor cables with
individual cable sections in the order of 0.25 to 0.5 mm
2 in order to make it easier to
connect. It is better to maintain the cables with mains voltage (power supply) separated
from the cables with low level signals (4-20 mA, etc.).
Before starting the installation, check that the cable glands are the right size for the cables
to be used. This will guarantee the instrument will stay watertight. The cable glands used
are for cables with outside diameters between 3.5 mm and 10 mm (see page 41 for more
details).
To connect the cables, peel the outside insulation to free the inner cables. It is
recommended to tin the ends of the wires to avoid loose ends. Pass the cables through
the cable glands and screw down in the corresponding positions of the terminal strip.
Once the wiring is finished make sure that the cables are well gripped by the cable glands
to maintain the degree of protection.
Incorrect installation of the cable gland or inadequate cable placement can cause
irreparable damage to the converter.
IMPORTANT NOTE:
In order to comply with the electrical safety requirements as per EN-
61010-1 (IEC 1010-1), the installation of the equipment must take into account the
following:
 A mains switch must be provided to disconnect the equipment. This switch must
be marked as the disconnecting device for the equipment and be within easy
reach of the operator.
 The mains supply must have an earth line.
 The housing must not be opened when the instrument has mains supply
connected.
IMPORTANT NOTE : To ensure smooth operation of the equipment, it is recommended to
make the connection paying attention to the following points:
 Do not change or modify the junction cable between the transducers and the
converter.
 It is recommended to pass the transducer cables through a metallic conduit. The
two cables can go through the same conduit, but never together with other
cables.
 For the output signals, use shielded cable when possible.
 Keep the cables away from strong sources of noise.
2
INSTALLATION OF THE ELECTRONIC CONVERTER