Rockwell Automation Allen-Bradley Guardmaster Dual-Input Safety Relay Application Technique
Safety function: actuator subsystems – stop category 0 via a safety relay and drive with hardwired safe torque-off
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Application Technique
Safety Function: Actuator Subsystems - Stop Category 0 via a
Safety Relay and PowerFlex 755 Drive with Hardwired Safe
Torque-off
Products: Guardmaster Dual-Input Safety Relay, PowerFlex 755 Drive
Safety Rating: CAT. 3, PLe to ISO 13849-1: 2008
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Table of Contents
Related Manuals for Rockwell Automation Allen-Bradley Guardmaster Dual-Input Safety Relay
Summary of Contents for Rockwell Automation Allen-Bradley Guardmaster Dual-Input Safety Relay
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Page 1: Table Of Contents
Application Technique Safety Function: Actuator Subsystems – Stop Category 0 via a Safety Relay and PowerFlex 755 Drive with Hardwired Safe Torque-off Products: Guardmaster Dual-Input Safety Relay, PowerFlex 755 Drive Safety Rating: CAT. 3, PLe to ISO 13849-1: 2008 Topic Page Important User Information General Safety Information... -
Page 2: Important User Information
If this equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be impaired. In no event will Rockwell Automation, Inc. be responsible or liable for indirect or consequential damages resulting from the use or application of this equipment. -
Page 3: General Safety Information
Safety circuits must take into consideration safety distance calculations, which are not part of the scope of this document. Contact Rockwell Automation to find out more about our safety risk assessment services. Safety Distance Calculations ATTENTION: While safety distance or access time calculations are beyond the scope of this document, compliant safety circuits often must take into consideration a safety distance or access time calculation. -
Page 4: Introduction
In this application, the performance level required (PLr) by the risk assessment is Category 3, Performance Level d (CAT. 3, PLd), for each safety function. A safety system that achieves CAT. 3, PLd, or higher, can be considered Rockwell Automation Publication SAFETY-AT144A-EN-P - August 2015... -
Page 5: Safety Function Requirements
When the input subsystem initiates a stop demand, the logic and output subsystems respond to stop the hazardous motion before a person can reach the hazardous area. The stop command cannot be reset until the guard door is closed. Rockwell Automation Publication SAFETY-AT144A-EN-P - August 2015... -
Page 6: Functional Safety Description
Once the relay is reset, the Start button can be pressed to start the hazardous motion. In this case, the Start button is connected directly to the drive as shown in the wiring diagram. Rockwell Automation Publication SAFETY-AT144A-EN-P - August 2015... -
Page 7: Bill Of Material
(guard door closed) and the reset button is pressed and released properly, the relay’s safety outputs energize and the drive STO inputs are powered. The hazardous motion can then be restarted by an additional, separate action, that is, pressing the Start button. Rockwell Automation Publication SAFETY-AT144A-EN-P - August 2015... - Page 8 0V DC - COM 24V DC STOP START Reset START/STOP COM 24V DC COM Jumpers: Logic ENABLE Installed Typical Safety Input Device SAFETY Removed Gate control 24V DC power supply Actuator Gate control circuit 0V DC Rockwell Automation Publication SAFETY-AT144A-EN-P - August 2015...
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Page 9: Configuration
Depending on the sensor subsystems and devices you choose, the overall safety rating of your system could be reduced. An example that describes how to calculate the safety rating for a complete safety function appears in the section titled Complete Safety Function PL Calculation Example on page Rockwell Automation Publication SAFETY-AT144A-EN-P - August 2015... - Page 10 The functional safety data for the SensaGuard switch used as the example input device is provided from the Rockwell Automation SISTEMA library. For instance, when the PowerFlex 755 drive is used, these are the SISTEMA calculations for the safety function, "Safety- related stop function initiated by a safeguard." Rockwell Automation Publication SAFETY-AT144A-EN-P - August 2015...
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Page 11: Verification And Validation Plan
The functional test includes normal operating conditions in addition to potential fault injection of failure modes. A checklist is typically used to document the validation of the safety control system. Rockwell Automation Publication SAFETY-AT144A-EN-P - August 2015... - Page 12 Restore the input device to its safe state. The machine must not start. The IN1 and IN2 status indicators of the Guardmaster dual-input safety relay must be steady green. The OUT status indicator must blink green. Rockwell Automation Publication SAFETY-AT144A-EN-P - August 2015...
- Page 13 In addition to the verification and validation steps provided here, consult the application technique for your input subsystem for IMPORTANT the steps required to validate the input device. Safety function application techniques are available at http:// marketing.rockwellautomation.com/safety/en/safety_functions. Rockwell Automation Publication SAFETY-AT144A-EN-P - August 2015...
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Page 14: Additional Resources
Provides declarations of conformity, certificates, and other certification details. www.ab.com 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. Rockwell Automation Publication SAFETY-AT144A-EN-P - August 2015... - Page 15 Safety Function: Actuator Subsystems – Stop Category 0 via a Safety Relay and PowerFlex 755 Drive with Hardwired Safe Torque-off Notes: Rockwell Automation Publication SAFETY-AT144A-EN-P - August 2015...
- Page 16 Rockwell Automation maintains current product environmental information on its website at http://www.rockwellautomation.com/rockwellautomation/about-us/sustainability-ethics/product-environmental-compliance.page. Allen-Bradley, Guardmaster, LISTEN. THINK. SOLVE, PowerFlex, Rockwell Automation, Rockwell Software, and SensaGuard are trademarks of Rockwell Automation, Inc. Trademarks not belonging to Rockwell Automation are property of their respective companies.