162 Rockwell Automation Publication 2198-UM001M-EN-P - November 2022
Chapter 9 Kinetix 5500 Safe Torque Off - Hardwired Safety
Wire the Safe Torque Off
Circuit
This section provides guidelines for wiring your Kinetix 5500 Safe Torque Off
drive connections.
Safe Torque Off Wiring Requirements
The Safe Torque Off (STO) connector uses spring tension to secure the wire.
Depress the tab, along side each pin, to insert or release the wire. Two rows of
pins are provided for drive-to-drive connections. Wire must be copper with
75 °C (167 °F) minimum rating.
Figure 76 - Safe Torque Off (STO) Terminal Plug
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 Establishing Noise Zones
beginning on page 41.
IMPORTANT Pins ST0-1 and ST0-2 (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
ST0-1 (SB+) as a power supply for the external safety device.
IMPORTANT Stranded wires must terminate with ferrules to help prevent short
circuits, per table D7 of ISO 13849-1.
1
2
3
4
5
SB+
SB-
S1
SC
S2
Remove
F
o
r DC
Bus Only
Kinetix 5500 Drive
Top View
Table 74 - Safe Torque Off (STO) Terminal Plug Wiring
Safe Torque Off (STO) Connector
Recommended Wire Size
mm
2
(AWG)
Strip Length
mm (in.)
Torque Value
N•m (lb•in)
Pin Signal
STO-1
STO-2
STO-3
STO-4
STO-5
SB+
SB-
S1
SC
S2
0.2…1.5
(24…16)
10 (0.39)
—
(1)
(1) This connector uses spring tension to hold the wires in place.
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