Rockwell Automation Publication 2198-UM002G-EN-P - February 2019 325
Kinetix 5700 Safe Torque-off Function Chapter 9
Description of Operation
The safe torque-off (STO) feature provides a method, with sufficiently low
probability of failure, to force the power-transistor control signals to a disabled
state. When the command to execute the STO function is received from the
GuardLogix controller, all of the drive output-power transistors are released
from the ON-state. This results in a condition where the motor is coasting.
Disabling the power transistor output does not provide isolation of the
electrical output that is required for some applications.
These conditions must be met for integrated control of the STO function:
• The Kinetix 5700 drive module must be added to the GuardLogix 5570
or Compact GuardLogix 5370 controller I/O Configuration.
• The module must be configured for Safety Only or Motion and Safety
connections
• The safety bypass jumper wires must be removed.
The Kinetix 5700 drive STO function reaction time is less than 10 ms.
Reaction time for the drive is the delay between the time the drive STO
command receives the CIP Safetyâ„¢ packet with an STO request and the time
when motion producing power is removed from the motor.
Table 163 - Safe Torque-off Network Specifications
Safe Torque-off Assembly Tags
In Integrated safe torque-off (STO) mode, a GuardLogix 5570 or Compact
GuardLogix 5370 safety controller commands the Kinetix 5700 safe torque-off
function through the appropriate tag in the safety output assembly.
IMPORTANT If the STO bypass jumper wires were applied during machine
commissioning or maintenance, they must be removed before the drive
will operate in Integrated STO mode.
Attribute 2198-xxxx-ERS3 2198-xxxx-ERS4
STO function reaction time 10 ms, max
Safety connection RPI, min 6 ms
Input assembly connections
(1)
(1) Motion and Safety and Safety Only connections with the inverter uses 1 input assembly connection and 1 output assembly
connection.
31
Output assembly connections
(1)
1
Integrated safety open request support Type 1 and Type 2 requests
IMPORTANT The tag names listed in Table 164 changed in the Logix Designer application,
version 31 and later, depending on how Motion Safety is configured in the
Module Definition.
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