Siemens 340 Manual page 152

Typical circuits
A.2 Typical circuits for 3RM1 Failsafe
Protection against electrically conductive contamination!
The devices must be protected against conductive contamination while taking account of
the ambient conditions. One way you can do this is to install the devices in a control cabinet
with the appropriate degree of protection. You will find further information in IEC 60529, for
example.
Safe functional extra-low voltage
The 3RM11/3RM13 Failsafe motor starters with a supply voltage of 24 V DC must be
operated with safe functional extra-low voltage (SELV, PELV). This means these modules
must only be subjected to a voltage of Um even in the event of a fault. The following applies
to these 3RM1 motor starters: Um < 60.0 V.
You can find more detailed information about safe functional extra low voltage in the data
sheets of the power supplies to be used.
Protection against electrostatic charge
When handling and installing the 3RM11/3RM13 Failsafe motor starters, ensure that the
components are protected against electrostatic charge. Changes to the system
configuration and wiring are only permissible in the voltage-free state.
Connection of 3RM11/3RM13 Failsafe motor starters is only permissible when the power
supply units (PELV and SELV) are switched off.
Noise immunity / grounding
The following must be grounded in accordance with regulations to ensure noise immunity of
the 3RM11/3RM13 Failsafe motor starters:
• PELV / SELV power supply units (please also note the documentation for the respective
Note
Operational faults and malfunctions in communication
If the EMC Directive 2004/108/EC is not complied with when plants and devices are
installed, communication breaks may occur.
Note
Cover the 3ZY12 device connector on the left-hand side using the cover supplied with the
device termination connector.
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WARNING
WARNING
CAUTION
CAUTION
power supply unit in this regard).
SIRIUS 3RM1 motor starter
Manual, 11/2013, A5E0345285095020A/RS-AB/002