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2. Safety instructions for electrical drives and controllers
Festo P.BE-CMMP-CO-SW-EN 0708NH
19
2.3.4
Protection against Electrical Shocks through Low-Voltage
Protection (PELV)
All connections and terminals with voltages from 5 to 50 volts on the motor controller are
of the low-voltage protection type, which are designed to be shock-proof in accordance
with the following standards:
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International: IEC 60364-4-41
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European countries in the EU: EN 50178/1998, section 5.2.8.1
Warning
DANGER!
High electrical voltage due to incorrect connection!
Danger of death or injury from electric shock!
Only devices, electrical components and lines with low-voltage protection (PELV =
Protective Extra Low Voltage) can be connected to any connections and terminals with
voltages from 0 to 50 volts.
Connect only voltages and circuits with safe separation from dangerous voltages.
Safe separation is achieved through isolating transformers, secure optocouplers or
mains-free battery operation.
2.3.5
Protection against Hazardous Movements
Hazardous movements can also be caused by faulty triggering of connected motors.
The causes can be of the most varied of kinds:
-
dirty or defective wiring or cabling
-
errors in operating components
-
faults in the measurement and signal transmitters
-
defects or components that are not EMC-suitable
-
faults in the software in the higher-level control system.
These malfunctions can occur immediately after switch-on or after an indefinite time in
operation.
Monitoring in the drive components exclude malfunctions in the connected drives as much
as possible. But this alone cannot be relied on when protection of people and especially
the danger of bodily injury and/or property damage are considered. Until the installed
monitoring takes effect, a defective drive movement must definitely be expected, the
amount of which depends on the type of control and the operating state.
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