174 Rockwell Automation Publication 2198-UM001I-EN-P - May 2019
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
Table 70 - Safe Torque-off (STO) 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 Establishing Noise Zones
beginning on page 44.
IMPORTANT Pins ST0-1 and ST0-5 (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 as a power supply
for the external safety device.
IMPORTANT Stranded wires must terminate with ferrules to prevent short circuits, per
table D7 of ISO 13849-1.
1
2
3
4
5
SB+
SB-
S1
SC
S2
Remove
For DC
Bus Only
Kinetix 5500 Drive
Top View
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) N/A
(1)
(1) This connector uses spring tension to hold the wires in place.
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