2. Safety instructions for electrical drives and controllers
Festo P.BE-CMMS-AS-HW-EN en 0708NH 19
Warning
During installation note the amount of intermediate circuit volt-
age, especially with regard to insulation and protective meas-
ures.
Make sure that the earthing, the cross section size of the conductor
and the corresponding short-circuit protection are correct.
2.4.4 Protection by low voltage (PELV) against electric shock
Voltages from 5 to 50 V on the connections and terminals of the motor controller are pro-
tective small voltages which can be touched without danger in accordance with the follow-
ing standards:
- international: IEC 60364-4-41
- European: EN 50178
Warning
DANGER !
High electric voltage due to incorrect connection!
Mortal danger, danger of injury from electric shock.
Devices, electrical components and cables may only be connected to connections and ter-
minals from 0 to 50 V, providing they have protective low voltage (PELV = Protective Extra
Low Voltage).
Connect only voltages and current circuits which have reliable separation of dangerous
voltages. Such separation is achieved e.g. with isolating transformers, reliable optocou-
plers or battery operation separate from the mains network.
2.4.5 Protection against dangerous movements
During initial start-up, the safety functions used, e.g. "Safe standstill", must be checked
for proper functioning.
The user shall establish a regular inspection of the safety function.
Dangerous movements can be caused by incorrect control of connected motors. There are
various causes:
- Unsafe or faulty circuitry or cabling
- Faults in operating the components
- Faults in the measured value and signal generators
- Faults or non-EMC-compliant components
- Faults in the software in the higher-order control sys-
tem
These faults can occur immediately after the device is switched on or after an uncertain
period of operation.
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