Rockwell Automation 22А PowerFlex DriveGuard Safe-Off User Manual - Series B - Manual (Page 2)

2 Rockwell Automation Publication PFLEX-UM003B-EN-P - July 2012
General Description
General Description
The DriveGuard Safe Torque Off option, when used with PowerFlex 40P or
PowerFlex 70 drives together with other safety components, provides a safety
function which inhibits torque generation in the motor(s) powered by the
drive. When used with PowerFlex 40P or PowerFlex 70 drive, the DriveGuard
Safe Torque Off option has been certified to meet the requirements for SIL 2
according to EN/IEC 61800-5-2 and IEC 61508, and PL d and Category 3
according to EN ISO 13849-1. The DriveGuard Safe Torque Off option is
just one component in a safety control system. Components in the system
must be chosen and applied appropriately to achieve the desired level of
safeguarding.
What Is the DriveGuard Safe Torque Off Option?
The DriveGuard Safe Torque Off option:
• Provides the “Safe torque off (STO)” function defined in EN/IEC
61800-5-2.
• Blocks gate firing signals from reaching the IGBT output power devices
of the drive. This prevents the IGBT’s from switching in the sequence
necessary to generate torque in the connected motor.
• Can be used in combination with other safety devices to fulfill the
requirements of a system “safe torque off ” function which satisfies
Category 3 / PL (d) according to EN ISO 13849-1 and SIL CL 2
according to EN/IEC 62061, IEC 61508, and EN/IEC 61800-5-2.
IMPORTANT This option is suitable for performing only mechanical work on the drive system or
affected area of a machine. It does NOT disconnect or isolate the drive power output
to the motor.
This option should not be used as a control for normal starting and/or stopping the
drive.
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