Weidmüller 1334950000, Manual

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6 2604080000/03/08.2020 Manual u-control
2 Safety | Intended use
2.2 Intended use
The products of the UC20 series are intended for use in in-
dustrial automation. A u-control station comprising a control-
ler and connected u-remote I/O modules is intended for the
control of systems or sub-systems.
The UC20-WL2000 controllers
are configured and pro -
grammed using the integrated web application u-create web.
The UC20-SL2000 controllers
are configured and pro -
grammed using the separate engineering tool u-create stu-
dio.
The UC20 products conform to protection class IP20 (in ac-
cordance with IEC 60529).
The observance of the documentation is part of the intended
use. The products described in this manual may only be used
for the intended applications and only in connection with
certified third-party devices or components. The product-
specific protective measures can become ineffective in the
event of deviating use.
2.3 Use in a potentially explosive atmosphere
Unless otherwise noted, the u-control products can be used
in potentially explosive atmospheres rated as Zone 2 (as per
Directive 2014/34/EU). The u-remote products are suitable
for use in Class I, Division 2, Groups A to D according to
NFPA publication 70.
If u-remote products are used in potentially explosive atmos-
pheres, the following notes are also applicable:
– Staff involved in assembly, installation and operation must
be qualified to perform safe work on electrical systems
protected against potentially explosive atmospheres.
– The requirements according to IEC 60079-14 must be
observed.
– The substitution of any components may impair suitability
for Class I, Divsion 2.
– The equipment shall be installed in an enclosure that pro-
vides a degree of protection not less than IP54 in accord-
ance with IEC 60079-15, accessible only by the use of a
tool.
– The housing enclosing must meet the requirements of
explosion protection type Ex n or Ex e.
– The u-control station may only be installed in horizontal
orientation.
– The controller may only be used without battery.
– Sensors and actuators that are located in Zone 2 or in a
safe zone can be connected to the u-control station.
– If the ambient temperature under rated conditions exeeds
55 °C, the cables used for feed-in (on the fieldbus coupler
and on power-feed modules) must be specified for at
least 90 °C.
– If the temperature under rated conditions exceeds 70 °C
at the cable or conduit entry point, or 80 °C at the
branching point of the conductors, the temperature speci-
fication of the selected cable shall be in compliance with
the actual measured temperature values.
– The equipment shall only be used in an area of not more
than pollution degree 2, as defined in IEC 60664-1.
– A stabilized 24 V DC power supply with double or rein -
forced insulation shall be used.
– A visual inspection of the u-control station is to be per-
formed once per year.
– When using relais modules UR20-4RO-CO-255, solid
state relais modules UR20-4RO-SSR-255 or
UR20-4DI-2W-230V-AC modules in explosive atmos-
phere:
– The device shall be installed in an environment free of
condensation, corrosives and conducting dusts.
– If the switching or input voltage exceeds 63 V, a tran -
sient protection device shall be provided that limits the
transients to a peak voltage of 500 V or less.
– When using relais modules UR20-4RO-CO-255 in explo-
sive atmosphere:
– Make sure that the module will not be exposed to
chemicals, which may degrade the sealing properties
of materials used in the relay.
– Due to the fact that relays are subject to wear, it must
be ensured, by appropriate maintenance intervals, that
the temperature do not exceed the limits of tempera-
ture class T4. A contact resistance of more than
110 mΩ will be considered as a fault.
– The modules may only be charged with resistive loads.
– While explosive atmosphere is present:
– No electrical connection shall be separated in ener-
gized condition.
– The USB interface shall not be used.
– Dip-switches, binary-switches and potentiometers shall
not be actuated.