Rockwell Automation Publication 2198-UM001I-EN-P - May 2019 175
Kinetix 5500 Safe Torque-off - Hardwired Safety Chapter 9
Safe Torque-off Feature
The safe torque-off 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 safe torque-off circuit is designed to safely turn off all of the output-power
transistors. You can use the safe torque-off 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-Hxxx-ERS drives do not operate without a safety circuit or safety
bypass wiring. For applications that do not require the safe torque-off feature
you must install jumper wires to bypass the safe torque-off circuitry.
Each 2198-Hxxx-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 77
. With the jumper wires installed, the safe-off feature is not used.
Figure 77 - 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.
SHOCK HAZARD: In Safe Torque-off 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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