Allen-Bradley Allen-Bradley Home

Drives Safety Features

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.

Features

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

Certifications

  • 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.

Frequently Viewed Publications

TitleNumberLanguage
Safe Speed Monitor Safety Reference Manual750-RM001
More Drive publications in Literature LibraryAll Languages

Product Catalog

Find catalog numbers, certifications, and specifications.

Certifications

See our Product Certification site for Declarations of Conformity, certificates and other certification details.

Can’t Find What You Need?

Browse our Literature Library where you can search for additional publications in more languages. You can also use the Advanced Search feature to search by catalog number, publication type, title, or keywords to narrow your results.

Build This Catalog Number

Build or verify a catalog number, and get information and CAD drawings for these products.

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.

Available accessories include:

  • DriveGuard® Safety Isolation System
  • DriveGuard safe-off
  • DriveGuard safety relay option helps reduce wiring and keeps drive and I/O powered, which decreases restart time.
  • A DriveLogix™ option is an embedded Logix controller used for logic and complex motion programming.
  • Safety wizards provide an easy-to-use method to configure safety parameters in a device. Graphics and text are used to simplify the step-by-step configuration process:
    • PowerFlex® 755 Safe Speed Monitor
    • MSR57 Safety Relay Startup

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.