Rockwell Automation Publication 2097-UM002D-EN-P - April 2017
107
Kinetix 350 Drive Safe Torque-off Feature
Chapter 6
Kinetix 350 Drive Safe
Torque-off Feature
The safe torque-off circuit, when used with suitable safety components,
provides protection according to EN ISO 13849-1 (PLd). The safe torque-off
option is just one safety control system. 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 remove power safely from the gate
firing circuits of the drives output power devices (IGBTs). This prevents them
from switching in the pattern necessary to generate AC power to the motor.
You can use the safe torque-off circuit in combination with other safety devices
to meet the stop and protection-against-restart requirements of EN ISO
13849-1.
Safe Torque-off Feature Bypass
The drive is supplied from the factory with the safe torque-off circuit enabled.
The drive is not operational until +24V is present at terminals STO-4 and
STO-6. When safety connections are not required, the drive can be operated
with the safety circuit disabled.
Use jumper wires, as shown, to defeat the safe torque-off function.
Figure 49 - STO Motion-allowed Jumpers
ATTENTION:
This option is suitable for performing mechanical work on only
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 motor. To avoid an electric shock hazard, disconnect power to
the motor and verify that the voltage is zero before performing any work on
the motor.
IMPORTANT
STO-1
STO-2
STO-3
STO-4
STO-5
STO-6
