166 Rockwell Automation Publication 2198-UM005C-EN-P - February 2022
Chapter 9 Kinetix 5300 Safe Torque Off Function
Safe Torque Off Feature The Safe Torque Off (STO) circuit, when used with suitable safety components,
provides protection according to ISO 13849-1 (PLd), Category 3 or according to
IEC 61508, IEC 61800-5-2, and IEC 62061 (SIL CL2). All components in the
system must be chosen and applied correctly to achieve the desired level of
operator safeguarding.
The STO circuit is designed to safely turn off all of the output-power
transistors. You can use the STO circuit in combination with other safety
devices to achieve Stop Category 0 and protection-against-restart as specified
in IEC 60204-1.
Safe Torque Off Feature Bypass
The 2198-Cxxxx-ERS drives do not operate without a safety circuit or safety
bypass wiring. For applications that do not require the STO feature you must
install jumper wires to bypass the STO circuitry.
Each 2198-Cxxxx-ERS drive includes one 10-pin wiring plug for wiring to
safety devices. To bypass the safety function, wire these signals as shown in
Figure 75
. With the jumper wires installed, the safe-off feature is not used.
Figure 75 - Safe Torque Off Bypass Wiring
ATTENTION: This option is suitable only for performing mechanical work on the
drive system or affected area of a machine. It does not provide electrical safety.
ATTENTION: If the STO function is requested and results in torque producing
power being removed, some applications can require additional safety
measures to prevent hazardous motion.
SHOCK HAZARD: In STO mode, hazardous voltages can still be present at the
drive. To avoid an electric shock hazard, disconnect power to the system and
verify that the voltage is zero before performing any work on the drive.
ATTENTION: Personnel responsible for the application of safety-related
programmable electronic systems (PES) shall be aware of the safety
requirements in the application of the system and shall be trained in using the
system.
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