Weidmuller UR20 Series, Manual

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2 Safety | General safety notice
5 Manual Communication module UR20-4COM-IO-LINK 2547720000/03/09.2019
This chapter includes general safety instructions for handling
the communication module UR20-4COM-IO-LINK. Specific
warning notices for specific tasks and situations are given at
the appropriate places in the documentation. Failure to ob-
serve the safety and warning notices can result in damage to
persons and material.
This manual contains product-specific
information and notes about the communication
module UR20-4COM-IO-LINK. It supplements but
does not replace the u-remote IP20 manual
(document No. 1432790000). The manual
is available to download from the Weidmüller
website.
2.1 General safety notice
Work on the u-remote products may only be performed by
qualified electricians with the support of trained persons.
As a result of their professional training and experience, an
electrician is qualified to perform the necessary work and
identify any potential risks.
Before any work is carried out on the products (installa-
tion, maintenance, retrofitting), the power supply must be
switched off and secured against being switched on again.
Work may be carried out with safety extra-low voltage
(SELV/PELV). When working during continued operations,
the emergency stop mechanisms must not be made ineffec-
tive.
The u-remote products do not comprehend any components
or parts that can be maintained by the operator. If a malfunc-
tion on a u-remote product cannot be fixed after following
the recommended measures (see Chapter 9 ), the product in
question must be sent back to Weidmüller. Weidmüller does
not assume any liability if the product has been tampered
with!
Electrostatic discharge
u-remote products can be damaged or destroyed by electro-
static discharge. When handling the products, the neces-
sary safety measures against electrostatic discharge (ESD)
according to IEC 61340-5-1 and IEC 61340-5-2 must be
observed.
All devices are supplied in ESD-protected packaging. The
packing and unpacking as well as the installation and di-
sassembly of a device may only be carried out by qualified
personnel and in accordance with the ESD information.
Open equipment
u-remote products are open equipment that may only be in-
stalled and operated in lockable housings, cabinets or electri-
cal operations rooms. Only trained and authorised personnel
may access the equipment.
For applications requiring functional safety, the surrounding
housing must meet at least IP54. The standards and guide -
lines applicable for the assembly of switch cabinets and the
arrangement of data and supply lines must be complied
with.
Fuse protection
The operator must set up the equipment so that it is pro-
tected against overloading. The 24 V DC power supply units
used must fulfill the SELV category, no matter whether they
supply the system or feed-in modules. The output voltage of
the feed-in power supply has to fulfill overvoltage category 1
according to IEC 61010. When connecting to outer current
circuits the respective overload category has to be regarded
for each single module of the u-remote station (see technical
data).
The main switch, the switches of the subsequent circuits,
the cable cross-sections and the fuse protection have to be
configured according to IEC 61010. The current demand
must be caluclated separately for each single u-remote sta-
tion as described in the u-remote IP20 manual.
In the case of modules without fused sensor/actuator power
supplies, all lines to the connected sensors/actuators must
be fused corresponding to their conductor cross-section (as
per DIN VDE 0298 Part 4).
To meet UL-specifications in accordance with UL 248-14,
a UL-certified automatic fuse (e.g. ABB Type S201-B16)
or a 10 A fuse with a medium time-lag (e.g. ESKA Part No.
522.227) must be used.
All connections of the u-remote components are protected
against voltage pulses and overcurrent in accordance with
IEC 61131-2, Zone B. The operator has to decide whether
additional overvoltage protection according to IEC 62305
is required. Voltages that /-30 V may cause the de -
struction of couplers and modules.
Earthing
Via an FE spring on its underside each coupler and each
module is electrically connected to the DIN rail. This con-
nection is only established certainly if the assembly is car-
ried out carefully and in accordance with the instructions
(u-remote IP20 manual). In order to ensure the earthing of
the station the DIN rail must be connected to the protective
earth via the earth terminals (PE).
2 Safety