Rockwell Automation Publication 2198-UM004A-EN-P - October 2019 383
Kinetix 5100 Safe Torque Off (STO) Feature Chapter 13
Wire the Safe Torque Off
Circuit
This section provides guidelines for wiring your Kinetix 5100 Safe Torque Off
(STO) drive connections.
Safe Torque Off Wiring Requirements
The Safe Torque Off (STO) connector uses spring tension to secure the wire.
Depress the orange tab along side each pin to insert or release the wire. Wire must
be copper with 75 °C (167 °F) minimum rating.
Figure 196 - Safe Torque Off Terminal Plug
Table 114 - Safe Torque Off Terminal Plug Wiring
IMPORTANT The National Electrical Code and local electrical codes take precedence over the
values and methods provided.
IMPORTANT To improve system performance, run wires and cables in the wireways as
established in Establish Noise Zones
beginning on page 33.
IMPORTANT Pins SB+ and SB– are 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 SB+ as a power supply for the external safety
device.
IMPORTANT Stranded wires must terminate with ferrules to prevent short circuits, per table
D.4 of ISO 13849-2:2012.
Kinetix 5100 Servo Drive
Top View
Signal
Recommended Wire Size
mm
2
(AWG)
Strip Length
mm (in.)
Torque Value
N•m (lb•in)
SB+
SB-
S1
S1C
S2
S2C
SS+
SS-
0.75 (18))
(stranded wire with ferrule)
1.5 (16)
(solid wire)
8.0 (0.31) N/A
(1)
(1) This connector uses spring tension to hold the wires in place.
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