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Drives Safety Features

Many of our PowerFlex® drives offer certified safety options—Safe Torque-Off and Safe Speed Monitor—to help provide integral, cost-effective, and certified protection for AC drive control.

  • Overview
  • Documentation
  • Resources
  • Applications


Safe Torque-Off (DriveGuard®)

  • Provide integral, certified protection for AC drive control in variable speed applications
  • Prevents a drive from delivering rotational energy to motors
  • Quick start-up after a demand on the safety system
  • Helps reduce wear from repetitive start-up
  • Includes a separate dedicated enable input on the base drive

Safe Speed Monitor

  • Lets operators perform process or maintenance work without stopping the machine
  • Includes an integrated monitoring relay
  • Supports single-axis or multi-axis applications and can be configured as a master or slave
  • Includes five inputs, three sets of safety outputs, and one bipolar safety output
  • Each input supports safe stop, safe limited speed monitoring, door monitoring, enabling switch monitoring, lock monitoring
  • Additional reset input resets and monitors the safety circuit
ProductPowerFlex® Drive
40P 525 70 700H 700L 700S 753/755
Safe Torque-off (DriveGuard®) Yes Yes Yes        
Safe Torque-off (DriveGuard) w/second Encoder         Yes * Yes  
Safe Torque-off (DriveGuard) (ATEX capable)       Yes      
Safe Torque-off             Yes
Safe Speed Monitor             Yes **
Safe Speed Functions (speed, acceleration, direction, etc.)             Yes
* When using PowerFlex 700S control.
** Requires the Dual Incremental Encoder option or Universal Feedback option.

Products Available

  • PowerFlex Safety Drives


  • Safe Torque-Off option: safety ratings up to and including SIL CL3, PLe, and CAT 3
  • Safe Speed Monitor option: safety ratings up to and including SIL CL3, PLe, and Cat 4

Certifications apply when product is marked. See our Product Certification site for Declarations of Conformity, certificates and other certification details.


Safe Speed Monitor Safety Reference Manual750-RM001
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Product Certifications

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Other Resources

  • Drives Support — Support resources for all drive products.
  • Safety Automation Builder — Streamline safety system design, including safety system layout, product selection, and safety analysis to help meet machinery safety performance level (PL) requirements established by ISO 13849-1.
  • Safety Resource Center — Access current safety-related white papers, videos, presentations, simulations, calculators, and other tools.
  • Knowledgebase — Visit our online resource for technical information, support chat and forums, software updates, and product safety advisories/notices.

Safe Torque-off is ideal for safety related applications requiring removal of rotational power to the motor without removing power from the drive.

The Safe Speed Monitor provides a solution for applications that can benefit from access to a safety zone while there is limited motion.