Festo Контроллер двигателя CMMD-AS - Manual (Page 20)

2. Safety instructions for electric drives and controllers
20 Festo P.BE-CMMD-AS-HW-EN 1002NH
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
protective small voltages which can be touched without danger in accordance with the
following standards:
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
terminals 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
optocouplers or battery operation separate from the mains network.
2.4.5 Protection against dangerous movements
During startup, the safety functions used, e.g. "Safe halt", 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:
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
- Errors in the software in the higher-order control system
These faults can occur immediately after the device is switched on or after an uncertain
period of operation.
The monitoring functions in the drive components exclude to a large extent the possibility
of incorrect operation of the connected drives. WIth regard to the protection of people,
especially the danger of bodily injury and/or material damage, one must not rely on these
circumstances alone. Until the installed monitoring functions become effective, you must
reckon with at least one faulty drive movement, the extent of which depends on the type
of control and on the operating state.