WIKA iWU-20 Betriebsanleitung Seite 27

7. Starting, operation
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If long connecting cables (greater than 30m) or leads outside buildings are to be used,
use screened leads. Note that with plug connectors, no connection between cable
screen and housing is possible. Take care, there- fore, for installations in explosion
hazard areas, that equipotential bonding is used.
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For instruments with cable outputs, the cable is always shielded. Depending upon the
design (ordered version) the screen may or may not be connected with the enclosure.
Also provide for equipotential bonding here, if necessary.
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Ensure that the cable diameter you select fits to the cable gland of the connector
Ensure that the cable gland of the mounted connector is positioned correctly and that
the sealing are available and undamaged. Tighten the threaded connection and check
the correct position of the sealing in order to ensure the ingress protection
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Please make sure that the ends of cables with flying leads do not allow any ingress of
moisture.
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The transducer must be connected and operated in accordance with the appropriate
regulations. Take care to ensure that the electrical connection (e.g. M12 connector) is
correctly made (fully sealed).
The transducer is designed to operate with an input voltage of 15 ... 30 VDC. The voltage value Ui = 30
VDC shall not be exceeded in the current loop circuit. The interrelationship between voltage supply and
load resistor (R ) is illustrated by the following diagram.
A
Signal output and allowed load
Current for external display- or evaluation equipment can be supplied directly from the circuit, when
operating a transducer with current output. A voltage drop specific to the display unit is to be considered.
WIKA Operating instructions iWU-2x
4 ... 20mA (2-wire)
permitted
range
Current output (2-wire)
4 ... 20mA:
R ≤(U+ - 15 V) / 0,022 A
A
with R in Ohm and U+ in Volt
A
EN
27