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Rockwell Automation Publication 35-UM001A-EN-P - May 2022
87
Chapter 6 Safety Functions
Contact Information If
Safety Failure Occurs
If you experience a failure with any safety-certified device, contact your local
Allen-Bradley distributor to request any of these actions:
•
Return the device to Rockwell Automation so the failure is appropriately
logged for the catalog number that is affected and a record is made of the
failure.
•
Request a failure analysis (if necessary) to determine the probable cause
of the failure.
Safe Torque Off (STO)
Function
The T
Ü
V Rheinland group has approved Armor PowerFlex drives with
hardwired and integrated Safe Torque Off for use in safety-related
applications up to ISO 13849-1 Performance Level e (PLe), SIL CL 3 per IEC
61508, IEC 61800-5-2, and EN/IEC 62061, in which removing the motion-
producing power is considered to be the safe state.
For product certifications currently available from Rockwell Automation, go to
. All components in the system must be chosen and
applied correctly to achieve the desired level of operator safeguarding.
Description of Operation
The Armor PowerFlex STO circuit is designed to turn off all output-power
transistors when the STO function is requested. You can use the Armor
PowerFlex
STO circuit in combination with other safety devices to achieve a
Stop Category 0 stop as described in
Stop Category Definition for STO on
, and protection-against-restart as specified in IEC 60204-1.
The Safe Torque Off feature provides a method, with sufficiently low
probability of failure, to force the power-transistor control signals to a disabled
state. When disabled, or anytime power is removed from the safety enable
inputs, all drive output-power transistors are released from the On state. This
results in a condition where the drive performs a Category 0 Stop (see
Category Definition for STO on page 88
). Disabling the power transistor
output does not provide physical isolation of the electrical output that is
required for some applications.
See
Safe Brake Control Function on page 105
for information on how to use a
mechanical brake with the drive.
ATTENTION:
When designing your system, consider how various
personnel can interact with the machine. Additional safeguard devices
can be required for your specific application.
ATTENTION:
If there is a failure of two output IGBTs in the Armor
PowerFlex drive, the Armor PowerFlex drive can provide energy for up to
180° of rotation in a 2-pole motor before torque production in the motor
ceases.
ATTENTION:
When STO is demanded, the motor output provides
mechanical isolation of the electrical output that is required for some
applications.
ATTENTION:
In circumstances where external influences (for example,
falling of suspended loads) are present, additional measures (for
example, mechanical brakes) may be necessary to help prevent any
hazard.
Содержание Allen-Bradley 35E
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