262 Rockwell Automation Publication 750-IN001O-EN-P - October 2014
Chapter 5 I/O Wiring
Safe Torque Off Option
Module
The 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 operational safety. For detailed information on applying this
option, refer to the PowerFlex 750-Series Safe Torque Off User Manual,
publication 750-UM002
.
Table 63 - TB2 Terminal Designations
Important Safe Torque Off Option Module Installation Notes
Cabling
• Safety input wiring must be protected against external damage by cable
ducting, conduit, armored cable or other means.
• Shielded cable is required.
Power Supply Requirements
• The external power supply must conform to the Directive 2006/95/EC
Low Voltage, by applying the requirements of EN61131-2 Programmable
Controllers, Part 2 - Equipment Requirements and Tests and one of the
following:
– EN60950 - SELV (Safety Extra Low Voltage)
– EN60204 - PELV (Protective Extra Low Voltage)
– IEC 60536 Safety Class III (SELV or PELV)
– UL 508 Limited Voltage Circuit
– 24V DC ±10% must be supplied by a power supply that complies with
– IEC/EN60204 and IEC/EN 61558-1.
• For planning information, refer to the guidelines in Industrial Automation
Wiring and Grounding Guidelines, publication 1770-4.1.
Terminal Name Description
SP+ +24 Volt Safety Power User-supplied power: 24 volt ±10%
45 mA typical
SP- Safety Power Common
SE+ +24 Volt Safety Enable User-supplied power: 24 volt ±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 feeding the option
module. Do not remove the line voltage from the 24V DC power supply.
SP+
SE+
Sd
SP-
SE-
Sd
SE-
SP+
SP-
SE+
Sd Sd
Common
+24V
+24V
Common
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