Table of Contents
Advertisement
10/65
Safety instructions for electric drives and controls
3.3.2
Protective extra-low voltage as protection against electric shock
3.3.3
Protection against dangerous movements
Bosch Rexroth AG R911383774_Edition 03
ctrlX SAFETY "Safe Torque Off" Safety Option in ctrlX DRIVE
Protective extra-low voltage is used to allow connecting devices with basic
insulation to extra-low voltage circuits.
On components of an electric drive and control system provided by Rexroth,
all connections and terminals with voltages up to 50 volts are PELV
("Protective Extra-Low Voltage") systems. It is allowed to connect devices
equipped with basic insulation (such as programming devices, PCs,
notebooks, display units) to these connections.
Danger to life, risk of injury by electric shock! High electrical voltage by
incorrect connection!
If extra-low voltage circuits of devices containing voltages and circuits of
more than 50 volts (e.g., the mains connection) are connected to Rexroth
products, the connected extra-low voltage circuits must comply with the
requirements for PELV ("Protective Extra-Low Voltage").
Dangerous movements can be caused by faulty control of connected motors.
Some common examples are:
●
Improper or wrong wiring or cable connection
●
Operator errors
●
Wrong input of parameters before commissioning
●
Malfunction of sensors and encoders
●
Defective components
●
Software or firmware errors
These errors can occur immediately after equipment is switched on or even
after an unspecified time of trouble-free operation.
The monitoring functions in the components of the electric drive and control
system will normally be sufficient to avoid malfunction in the connected
drives. Regarding personal safety, especially the danger of injury and/or
property damage, this alone cannot be relied upon to ensure complete safety.
Until the integrated monitoring functions become effective, it must be
assumed in any case that faulty drive movements will occur. The extent of
faulty drive movements depends upon the type of control and the state of
operation.
Dangerous movements! Danger to life, risk of injury, serious injury or property
damage!
A risk assessment must be prepared for the installation or machine, with its
specific conditions, in which the components of the electric drive and control
system are installed.
As a result of the risk assessment, the user must provide for monitoring
functions and higher-level measures on the installation side for personal
safety. The safety regulations applicable to the installation or machine must
be taken into consideration. Unintended machine movements or other
malfunctions are possible if safety devices are disabled, bypassed or not
activated.
To avoid accidents, injury and/or property damage:
Hide quick links:
Advertisement
Table of Contents
