Work and safety instructions Filtration Learning System
14 © Festo Didactic 696684
5.3 Electrical system
• Risk of fatal injury in case of interrupted PE conductor!
– The protective conductor (yellow-green) must not be interrupted, either inside or
outside of the device.
– The insulation of the protective conductor must never be damaged or removed.
• Risk of death from series connection of power supply units!
Contact voltages of greater than 25 V AC or 60 V DC are not permissible.
Coming into contact with voltages of greater than 50 V AC or 120 V DC may be fatal.
– Do not connect voltage sources in series.
• Risk of death due to electric shock!
Protect the outputs of the power supply units (output sockets/terminals) and cables connected to them
from direct contact.
– Only use cables with adequate insulation and electric strength.
– Use safety sockets with fully shrouded contact points.
• Disconnect from all sources of electric power!
– Switch off the power supply before working on the circuit.
– Please note that electrical energy may be stored in individual components.
Information on this issue is available in the datasheets and operating instructions included
with the components.
– Caution!
Capacitors inside the device may still be charged even after being
disconnected from all sources of voltage.
• Devices with a grounding terminal must always be grounded.
– If a ground connection (green/yellow laboratory socket) is available, it must always be connected
to protective ground. The protective grounding must always be connected first (before voltage) and
disconnected last (after voltage).
– Some devices have high leakage current. These devices must be additionally grounded with
a protective earth conductor.
• Use safety extra-low voltages only: max. 24 V DC.
• The power supply unit must be operated only with a power supply with a grounding conductor.
• Establishing and disconnecting electrical connections
– Electrical connections may be established only in the absence of voltage.
– Electrical connections may be disconnected only in the absence of voltage.
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