Rockwell Automation Publication 520-UM001K-EN-E - August 2021 241
Appendix G Safe Torque Off Function
Enabling PowerFlex 525
Safe-Torque-Off
1. Remove all power to the drive.
2. Loosen the screw of terminals Safety 1, Safety 2 and Safety +24V
(S1, S2, S+) on the control I/O terminal block.
3. Remove the protective jumper.
4. Safe-Torque-Off function is now enabled and the terminals are ready to
function as safety inputs.
Wiring Important points to remember about wiring:
• Always use copper wire.
• Wire with an insulation rating of 600V or greater is recommended.
• Control wires should be separated from power wires by at least
0.3 m (1 ft).
See I/O Wiring
on page 36 for wiring recommendations and Control I/O
Terminal Designations on page 42 for terminal descriptions.
If Safety Inputs S1 and S2 are powered by an external +24V source, apply it only
in SELV system, PELV system or low voltage Class 2 circuit.
ATTENTION: To avoid an electric shock hazard, verify that the
voltage on the bus capacitors has discharged before performing any
work on the drive. Measure the DC bus voltage at the +DC and -DC
terminals or test points (refer to your drive’s user manual for the
location of the terminals). The voltage must be zero.
R1
S1 S2 S+ 11 12 13 14 15 16 17 18 19
R2 R5 R6 01 02 03 04 05 06 07 08
Recommended Wire
Type
Wire Type
(1)
(1) Recommendations are for 50 °C ambient temperature.
75 °C wire must be used for 60 °C ambient temperature.
90 °C wire must be used for 70 °C ambient temperature.
Description
Min Insulation
Rating
Shielded Multi-conductor shielded cable such as Belden 8770 (or equiv.)
0.750 mm
2
(18 AWG),
3 conductor, shielded.
300V, 60 °C
(140 °F)
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