Medium-voltage drive adds safe torque off (STO) option
The Allen-Bradley PowerFlex 7000 medium-voltage drive by Rockwell Automation has added a safe torque off (STO) option, which allows users to reliably remove power from the motor without removing power to the drive, enabling a faster re-start of the system after a safe state is reached. The STO option is designed directly into the drive control and it works side by side with the drive’s control functions and does not require additional electromechanical components. This helps eliminate wiring needs, and lower users’ hardware inventory and installation costs. Safety triggers wire directly to the drive, removing the need for additional hardware. The PowerFlex 7000 drive with safe torque off is TÜV-certified and certified to Safety Integrity Level (SIL) 3 of IEC 6150, and Performance Level e (PLe), Category 3 of ISO 13849-1.
The PowerFlex 7000 drive now also offers the option of enhanced torque control capabilities with Allen-Bradley TorqProve technology, which is designed for heavy-industry applications. The TorqProve technology can deliver 100 percent torque at zero speed and the drive’s control delivers the higher drive speed and torque response required for vertical lifting applications.
– Edited by CFE Media. See more Control Engineering motor and drive products.