User Documentation
2 Safety | General safety notice
5u-remote IP20 modules for functional safety manual 1484600000/07/11.2020
This section includes general safety instructions for handling
the u-remote system. Specic safety instructions for specic
tasks and situations are given at the appropriate places in
the documentation.
2.1 General safety notice
Work on the u-remote products may only be performed by
qualied electricians with the support of trained persons.
As a result of their professional training and experience, an
electrician is qualied to perform the necessary work and
identify any potential risks.
Before any work is carried out on the products (installa-
tion, maintenance, retrotting), the power supply must be
switched off and secured against being switched on again.
Work may be carried out with safety extra-low voltage.
When working during continued operations, the safety
equipments and devices must not be made ineffective.
If a malfunction on a u-remote product cannot be xed after
following the recommended measures (see the chapter8),
the product in question must be sent back to Weidmüller.
Weidmüller assumes no liability If the base or electronic
module 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 disas-
sembly of a device may only be carried out by qualied per-
sonnel 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 guidelines applicable for the assembly
of switch cabinets and the arrangement of data and supply
lines must be complied with.
Fusing
If safe I/O modules or safe power-feed modules are installed
within a u-remote station, a SELV/PELV power supply has to
be applied to ensure the safety functions.
The operator must set up the equipment so that it is protect-
ed against overloading. The upstream fuse must be designed
such that it does not exceed the maximum load current. The
maximum permissible load current of the u-remote compo-
nents can be found in the technical data.
To meet UL-specications in accordance with UL248-14,
a UL-certied automatic fuse (e.g. ABB Type S201-B16)
or a 8A fuse with a medium time-lag (e.g. ESKA Part No.
522.226) must be used.
All connections of the u-remote components are protected
against voltage pulses and overcurrent in accordance with
IEC61131-2, ZoneB. The operator has to decide whether
additional overvoltage protection according to IEC62305
is required. Voltages that exceed +/-30V may cause the de-
struction of couplers and modules.
A feed-in power supply with secure isolation must be used.
Earthing (functional earth FE)
Each u-remote I/O module is tted with an FE spring on the
underside which creates an electrical connection to the DIN
rail. In order to establish a secure connection, the assembly
must be carried out carefully in accordance with the instruc-
tions (see chapter 7 of the u-remote manual). The module is
earthed by connecting the DIN rail to the protective earth via
the earth terminal.
Shielding
Shielded lines are to be connected with shielded plugs and
xed on a shield bus in compliance with the relevant stan-
dard (see u-remote manual, chapter8).
2 Safety