Allen-Bradley PowerFlex 527, User Manual, Page: 90 / 176

90 Rockwell Automation Publication 520-UM002B-EN-E - December 2017
Chapter 4 PowerFlex 527 Integrated Safe Torque-Off
safety devices to achieve the stop and protection-against-restart as specified in
IEC 60204-1.
Safe Torque-Off Feature Bypass
PowerFlex 527 drives do not operate without a safety circuit or safety bypass
wiring. For applications that do not require the safe torque-off feature, you must
install jumper wires to bypass the safe torque-off circuitry.
PowerFlex 527 drives ship with the safety control in the out-of-box state and with
a safety bypass jumper in place. In this configuration, the PowerFlex 527 safe
torque-off function is disabled.
Safe Torque-Off Bypass Wiring
As-Shipped Safety Configuration
The PowerFlex 527 drive is shipped with:
• Safety control in out-of-box state
• Safety Bypass Jumper installed
In this configuration, the PowerFlex 527 safe torque-off function is disabled.
ATTENTION: This option is suitable only for performing mechanical work on
the drive system or affected area of a machine. It does not provide electrical
safety.
SHOCK HAZARD: In Safe Torque-Off mode, hazardous voltages can still be
present at the drive. To avoid an electric shock hazard, disconnect power to the
system and verify that the voltage is zero before performing any work on the
drive.
IMPORTANT
If safe torque-off is not required, the drive must be returned to the as-shipped
safety configuration to allow operation.
IMPORTANT
If the Safety Bypass Jumper is misplaced, it is acceptable to wire the S1, S2, and
S+ input terminals together.
S1 S2 S+
Safety Bypass Jumper
Hardwired Safety Inputs