6
Integrated safety function
6.1
Overview of the safety function
6.1.1
General information
The application-related safety function "Safe Torque Off" described below
has been implemented for personal protection in accordance with ISO
13849‑1, Category 4, PL e and IEC 62061, SIL3.
Before a safety function is selected, the drive system has to be
put into the appropriate state by command value input.
6.2
Safety function in special mode "Safe standstill"
6.2.1
Safe Torque Off (STO)
Brief description
Using the "Safe Torque Off" function requires the optional safety
technology module "T0".
The energy supply to the motor is safely interrupted with the safety function
"Safe Torque Off". The drive cannot generate any torque/force and, as a
consequence, it cannot generate any dangerous motions, either.
Before selecting the safety function "Safe Torque Off", the drive
system has to be decelerated via the command value input; there
is no drive-controlled deceleration!
Lethal injury and/or property damage caused
by unintended axis motion!
WARNING
⇒ If external force influences are to be expected with the safety function
"Safe torque off", e.g. in the case of a vertical axis, this motion has to be
safely prevented by additional measures, e.g. a mechanical brake or a
counterweight. For such axes, Bosch Rexroth recommends using the Safe
braking and holding system.
High electrical voltage! Danger to life, risk of
injury by electric shock or serious injury!
WARNING
During the time a safety function is active, power is not removed from the
motor; de-energize the drive before working on the motor.
Features
The safety function "Safe Torque Off" (STO) has the following features:
●
Corresponds to stop category 0 according to IEC 60204‑1
●
Is suited for safety-relevant applications up to SIL 3 according to IEC
62061.
●
Is suited for safety-relevant applications up to Category 4, PL e
according to ISO 13849‑1.
●
The energy supply to the motor is safely interrupted via two channels.
ctrlX SAFETY "Safe Torque Off" Safety Option in ctrlX DRIVE
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Integrated safety function
R911383774_Edition 03 Bosch Rexroth AG
