Allen-Bradley PowerFlex 527, User Manual

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100 Rockwell Automation Publication 520-UM002B-EN-E - December 2017
Chapter 5 Hardwired Control of Safe Torque-Off
Safe Torque-Off Connector
Data PowerFlex 527 terminals S1, S2, and 01 are used for hardwired control of safe
torque-off.
Terminals for Safe Torque-Off (STO) Connection
Wire the Safe Torque-Off
Circuit This section provides guidelines for wiring safe torque-off connections to your
PowerFlex 527 drive.
Safe Torque-Off Wiring Requirements
The safe torque-off (STO) connection wire must be copper with 75 °C (167 °F)
minimum rating.
Safe Torque-Off (STO) Connector Pinouts control
STO Pin Signal Description
01 Digital Common The return for digital I/O. It is electrically isolated (along with the digital
inputs and encoder power) from the rest of the drive.
S1 Safety 1 Safety input 1.
S2 Safety 2 Safety input 2.
S+ 24V +24V supply for safety circuit. This is internally tied to the +24V DC source
(terminal 11).
IMPORTANT
Digital Common (terminal 01) is common for the digital inputs, the safety
inputs, and the encoder power supply (optional).
R1
11 12 13 14 15 16 17
R2 R5 R6 01 02 03 04 05 06 07
S1 S2 S+
Safety Bypass Jumper
Hardwired Safety Inputs
IMPORTANT
The National Electrical Code and local electrical codes take precedence over the
values and methods provided.
IMPORTANT
Pin S+ (24V) is used to disable the safe torque-off function.
When wiring to the STO connector, use an external 24V supply for the external
safety device that triggers the safe torque-off request. To avoid jeopardizing
system performance, do not use pin S+ as a power supply for the external
safety device.
IMPORTANT
The National Electrical Code and local electrical codes take precedence over the
values and methods provided.