REXROTH RD 500 Series, Applications Manual

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1-6
Safety Instructions for Electric Servo Drives and Controls RD 500 RD51
DOK-RD500*RD51*******-IB04-EN-P
1.6 Protection against electrical shock by protective low
voltage (PELV)
All connections and terminals with voltages between 5 and 50 Volts on
Bosch Rexroth products are protective low voltages designed in accor-
dance with the following Standards:
•
International: IEC 60364-4-41
•
EU countries: Refer to EN 50178/1998, Section 5.2.8.1.
WARNING
High voltage due to wrong connections! Danger
to life, severe electrical shock and severe bodily
injury!
⇒
Only equipment, electrical components and cables of
the protective low voltage type (PELV = Protective
Extra Low Voltage) may be connected to all termi-
nals and connections with 0 to 50 Volts.
⇒
Only safely isolated voltages and electrical circuits
may be connected. Safe isolation is achieved, for
example, with an isolating transformer, a safe opto-
electronic coupler or when battery-operated.
1.7 Protection against dangerous movements
Dangerous movements can be caused by faulty control or the connected
motors. There are various causes:
•
unclean or wrong wiring of cable connections
•
inappropriate or wrong operation of equipment
•
malfunction of sensors, encoders and monitoring circuits
•
defective components
•
software errors
Dangerous movements can occur immediately after equipment has been
powered-up or even after an unspecified time of trouble-free operation.
The monitors in the drive components make faulty operation almost im-
possible. Regarding personnel safety, especially the danger of bodily
harm and property damage, this alone should not be relied upon to en-
sure complete safety. Until the built-in monitors become active and effec-
tive, it must be assumed in any case that some faulty drive movements
will occur. The extent of these faulty drive movements depends on the
type of control and the state of operation.