For your safety
Leuze electronic
MSI 100/200
11
1.4.2
Electrical safety
Direct / indirect contact
Protection against direct and indirect contact according to VDE 100 part 410 must be ensured
for all components connected to the system. In the event of an error, no hazardous parasitic
voltages may occur (single-fault tolerance).
Mandatory measures:
–
Use power supply units with safe insulation (PELV)
–
Decoupling of circuits that are not PELV systems
With the following components: optical couplers, relays or other components that satisfy
the requirements for safe insulation
Safe insulation
Only use devices with safe insulation if hazardous contact voltages can occur at their connec-
tions.
Power supply units for
24-V supply
Only use power supply units with safe insulation and PELV in accordance with EN 50178 /
VDE 0160. These units prevent short circuits between primary and secondary sides.
Connect the output-side GND connection of the power supply unit to the functional earth (FE)
of the system.
Ground connection
Ensure that all inputs and outputs of the system are connected to the same ground.
Insulation dimensioning
When selecting the equipment, take into account the contamination and overvoltages that
occur during operation. If necessary, take appropriate measures for voltage limitation.
Installation space and
installation position
Observe the requirements listed in the technical data regarding the installation space and the
installation position.
ESD note
WARNING: Loss of the safety function / hazardous body currents
Incorrect installation can result in loss of the safety function as well as in hazardous body
currents. Depending on the application, the user may be exposed to severe dangers.
•
Observe the notices for electrical safety.
•
Observe the warning notices at other locations in this document.
•
Dimension the used devices and design their installation in the system according to the
specific requirements.
•
Retest the equipment and systems that are retrofitted with the safety relay.
•
Observe the information in the user documentation for other used devices
(e.g., sensors, actuators or extension devices).
ATTENTION: Electrostatic discharge
Electrostatic discharge can damage or destroy components. When handling, take the nec-
essary safety precautions against electrostatic discharge (ESD) according to EN 61340-5-1
and IEC 61340-5-1.
