Rockwell Automation Publication 520-TD002A-EN-E - May 2015 41
PowerFlex 527 AC Drive Specifications
The PowerFlex 527 STO function is intended for use in safety-related applications where the de-energized state is
considered to be the safe state. All of the examples shown here are based on achieving de-energization as the safe state for
typical Machine Safety and Emergency Shutdown (ESD) systems.
Probability of Dangerous Failure Per Hour (PFH) Data
These PFH calculation is based on the equations from EN 61508 and show worst-case values.
Determination of safety parameters is based on the assumption that the system operates in High demand mode and that the
safety function is requested at least once a year.
This table provides data for a 10-year proof test interval and demonstrates the worst-case effect of various configuration
changes on the data.
Safety Reaction Time
The safety reaction time from an input signal condition that triggers a safe stop, to the initiation of the configured Stop
Type, is less than 12 ms.
Additional Resources
These documents contain additional information concerning related products from Rockwell Automation.
You can view or download publications at http://www.rockwellautomation.com/literature/
. To order paper copies of
technical documentation, contact your local Allen-Bradley distributor or Rockwell Automation sales representative.
Determination of safety parameters is based on the assumption that the system operates in High demand mode and that the
safety function is requested at least once every three months.
PFH for 10-year Proof Test Interval
Attribute Value
PFH (1e-9) 2.10
Proof test (years) 10
Title Publication
PowerFlex 527 Adjustable Frequency AC Drive User Manual 520-UM002
GuardLogix 5570 Controllers User Manual 1756-UM022
GuardLogix 5570 Controller Systems Safety Reference Manual 1756-RM099
CompactLogix 5370 Controllers User Manual 1769-UM021
Wiring and Grounding Guidelines for Pulse Width Modulated (PWM) AC Drives DRIVES-IN001
Preventive Maintenance of Industrial Control and Drive System Equipment DRIVES-TD001
Integrated Motion on the EtherNet/IP Network Configuration and Startup User Manual MOTION-UM003
Integrated Motion on the EtherNet/IP Network MOTION-RM003
PowerFlex DB (Dynamic Braking) Resistor Calculator PFLEX-AT001
Safety Guidelines for the Application, Installation and Maintenance of Solid State Control SGI-1.1
Guarding Against Electrostatic Damage 8000-4.5.2
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