ctrlX SAFETY "SafeMotion"
Motivation and objectives
5 System presentation
5.1 Motivation and objectives
5.1.1
Overview
The operational safety of machines and installations depends largely upon the
extent of dangerous movements generated by the machine.
In normal mode (also referred to as production mode or automatic mode),
protective devices prevent human access to danger points. These protective
devices also prevent parts/material from being ejected.
In the special mode (also called manual mode or setting-up mode), it is often
necessary for individuals to access danger zones when the entire installation
has not been de-energized. In these situations, machine operators must be
protected by internal mechanisms in the drive and the control unit.
The integrated Rexroth safety technology provides the user with the require-
ments, on the control unit and drive side, for implementing functions of per-
sonal and machine protection with a minimum of planning and installation
work. Compared to conventional safety technology, the integrated safety tech-
nology considerably increases the functionality and availability of machines.
Integrated safety technology is characterized by the following features:
● Complies with valid standards
● More system performance
●
Less system costs
●
Easy understanding of complex subjects
●
Improved diagnostics
● Simplified certification
● Easy commissioning
● Independent of control units
5.1.2
Comparison with conventional safety technology
A drive and control system with integrated safety technology differs from sys-
tems with conventional safety technology by the fact that the safety functions
are directly integrated in the intelligent drives in the form hardware and soft-
ware. This increases the functionality in all operation modes with a maximum of
safety (short reaction times).
For drive and control systems with integrated safety technology, the following
components of the conventional safety technology are not needed:
●
Motor standstill monitor to monitor the safe stop
● Speed monitor to monitor the safely reduced velocities
● Power contactors between controllers and motors
● Limit switch or position cam for area detection
Using the integrated safety technology increases the available personnel and
machine safety, because the total reaction time of the system in the case of
an error event, for example, is considerably reduced with regard to comparable
systems with conventional safety technology.
The following options are available to select and acknowledge the safety tech-
nology functions provided with the firmware and the optional safety technology
module “M5”:
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