304 Rockwell Automation Publication 2198-UM002L-EN-P - October 2021
Chapter 9 Kinetix 5700 Safe Torque-off Function
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.
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.
Table 169 - Safe Torque-off Network Specifications
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 170 changed in the Logix Designer
application, version 31 and later, depending on how Motion Safety is
configured in the Module Definition.
Table 170 - STO Tag Name Changes in the Logix Designer Application
STO Tag Names
Studio 5000 Logix Designer
(version 30 and earlier)
STO Only Tag Names
Studio 5000 Logix Designer
(version 31 and later)
Safe Stop Only - No Feedback Tag Names
Studio 5000 Logix Designer
(version 31 and later)
SO.SafeTorqueOff SO.SafeTorqueOff SO.STOOutput
SO.Reset SO.Reset SO.ResetRequest
To Next Page
Loading...
Need help?
General
