272 Rockwell Automation Publication 750-IN001P-EN-P - April 2017
Chapter 5 I/O Wiring
Safe Torque Off Option
Module
The Safe Torque Off option module 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 operational safety. For detailed information on
this option, see the PowerFlex 750-Series Safe Torque Off User Manual,
publication 750-UM002
.
Table 84 - TB2 Terminal Designations
Important Safe Torque Off Option Module Installation Guidelines
Follow these guidelines for the Safe Torque Off option module.
Cabling
Follow these guidelines for cabling:
• Safety input wiring must be protected against external damage by cable
ducts, conduit, armored cable, or other means.
• Shielded cable is required.
Power Supply Requirements
Follow these guidelines for power supply requirements:
• The external power supply must conform to the Directive 2006/95/EC
Low Voltage, by applying the requirements of EN 61131-2
Programmable Controllers, Part 2 – Equipment Requirements and Tests
and one of the following:
– EN 60950 – SELV (safety extra low voltage)
– EN 60204 – PELV (protective extra low voltage)
– IEC 60536 Safety Class III (SELV or PELV)
Terminal Name Description
SP+ +24V safety power User-supplied power: 24V ±10%
45 mA typical
SP- Safety power common
SE+ +24V safety enable User-supplied power: 24V ±10%
25 mA typical
SE- Safety enable common
Sd Shield Terminating point for wire shields when an EMC
plate or conduit box is not installed.
Sd Shield
Safety Input Connection Example
Power Supply
IMPORTANT: Only break the 24V DC user-supplied power that powers the
option module. Do not remove the line voltage from the 24V DC power supply.
SE-
SP+
SP-
SE+
Sd Sd
Common
+24V
+24V
Common
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