Safety notes for electrical drives and controllers
Page 25
DANGER!
High electrical voltages due to wrong connections!
Danger to life, risk of injury due to electrical shock!
Only devices and electrical components and wires with a protective extra low voltage (PELV) may be connected to connectors
and terminals with voltages between 0 to 50 Volts.
Only connect voltages and circuits with protection against dangerous voltages. Such protection may be achieved by means of
isolation transformers, safe optocouplers or battery operation.
2.4.5
Protection against dangerous movements
Dangerous movements can be caused by faulty control of connected motors, for different reasons:
Improper or faulty wiring or cabling
Error in handling of components
Error in sensor or transducer
Defective or non-EMC-compliant components
Software error in superordinated control system
These errors can occur directly after switching on the device or after an indeterminate time of operation.
The monitors in the drive components for the most part rule out malfunctions in the connected drives. In view of personal
protection, particularly the danger of personal injury and/or property damage, this may not be relied on exclusively. Until the
built-in monitors come into effect, faulty drive movements must be taken into account; their magnitude depends on the type of
control and on the operating state.
DANGER!
Dangerous movements!
Danger to life, risk of injury, serious personal injuries or property damage!
For the reasons mentioned above, personal protection must be ensured by means of monitoring or superordinated measures
on the device. These are installed in accordance with the specific data of the system and a danger and error analysis by the
manufacturer. The safety regulations applying to the system are also taken into consideration. Random movements or other
malfunctions may be caused by switching the safety installations off, by bypassing them or by not activating them.
