Bosch Rexroth ctrlX SAFETY - Product Presentation; What Is Integrated Safety Technology

Procedure
To obtain the highest possible degree of safety, the machine manufacturer
when choosing the solutions has to apply the following basic principles in the
indicated order:
1. Eliminate or minimize the hazards by design measures.
2. Take the required protective measures against hazards that cannot be
eliminated.
3. Document the remaining risks and inform the user of these risks.
Simplification by using the integra‐
ted safety technology
When using integrated safety technology, the machine manufacturer will
benefit from the following simplifications:
● The safety-related device components of the ctrlX DRIVE product line
with the "T0" option are suited for applications up to SIL3 of IEC 62061
or up to Category 4, PL e of ISO 13849‑1. This means that the optional
safety technology modules of the ctrlX DRIVE range allow safety
functions to be implemented that comply with SIL1, SIL2 or SIL3 of IEC
62061 or PL a, PL b, PL c, PL d or PL e of ISO 13849‑1.
● The safety technology functions integrated in ctrlX DRIVE were certified
by TÜV Rheinland
®
. This guarantees the user that the solution complies
with the state-of-the-art / the conformity of the components in
accordance with the Machinery Directive 2006/42/EG is ensured.
Safety Integrity Level (SIL): relation between the SILs of IEC 62061 and the
Performance Level (PL) of EN ISO 13849‑1
Performance Level
(PL)
Average probability of dangerous failure
[1/h] (PFH)
Safety Integrity Level
(SIL)
Risk
a
≥10
-5
...<10
-4
-
b
≥3*10
-6
...<10
-5
1
c
≥10
-6
...<3*10
-6
1
d
≥10
-7
...<10
-6
2
e
≥10
-8
...<10
-7
3
Tab. 4-1: Safety Integrity Level: failure limit values for a safety function of a
PDS(SR)
4.2 Product presentation
4.2.1 What is "integrated safety technology"?
ctrlX DRIVE
The drive controllers of the ctrlX DRIVE product line can be equipped with the
optional module "T0" [STO (Safe Torque Off)].
The optional module "T0" equips ctrlX DRIVE with integrated safety
technology that provides the user with Safe Torque Off.
Definition
"Safe Torque Off" is an application-related safety function that safely
interrupts the energy transmission from the controller to the motor (according
to IEC 61800‑5‑2).
"Safe Torque Off" is applicable for personal protection at machines according
to ISO 13849‑1 Category 4, PL e and IEC 62061 SIL 3.
Selecting the function
The safety functions are selected via 24 V inputs at the drive controller.
Certification
The safety technology was certified by TÜV Rheinland ®. The NRTL listing
by TÜV Rheinland of North America is available for HCS01. The other series
are in preparation.
ctrlX SAFETY "Safe Torque Off" Safety Option in ctrlX DRIVE 17/65
System overview
R911383774_Edition 03 Bosch Rexroth AG