2. Safety instructions for electric drives and controllers
Festo.P.BE-CMMS-ST-G2-HW-EN 1008NH 21
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
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
- Faults in the software in the higher-order control system
- Removal of end-stage enable
These faults can occur immediately after the device is switched on or after an
indeterminate 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 human
beings, especially the danger of bodily injury and/or material damage, one must not rely
on this fact alone. Until the fitted monitoring functions become effective, you must reckon
with at least one incorrect drive movement, the extent of which depends on the type of
control and on the operating state.
Warning
DANGER!
Hazardous motion
Danger of injury or death, serious bodily injury or material damage.
For the above-mentioned reasons, the protection of human beings must be ensured with
the aid of monitoring systems or by measures which are of higher order than the system.
These measures are incorporated depending on the specific findings of a danger and fault
analysis by the system manufacturer. The safety regulations applicable to the system
must be observed here as well. Undesired movements of the machine or other incorrect
functions can occur as a result of switching off, avoiding or failing to activate safety
devices.
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