Rockwell Automation Publication 2198-UM001D-EN-P - May 2014
165
Kinetix 5500 Safe Torque-off - Hardwired Safety
Chapter 9
Cascade the Safe Torque-off Signal
The total number of drives in a single cascaded safety circuit is limited due to the
current carrying capacity of the cascaded safety wiring. Refer to
Table 77
for
current rating per channel, per drive.
Figure 72 - Cascaded Safe Torque-off Wiring
Safe Torque-off
Specifications
To maintain safety rating, Kinetix 5500 drives must be installed inside protected
control panels or cabinets appropriate for the environmental conditions of the
industrial location. The protection class of the panel or cabinet must be IP54 or
higher.
Table 77 - Safe Torque-off Signal Specifications
Pin 1
SB+
SB-
S1
SC
S2
Pin 1
24V DC
First Drive
Middle Drive
Last Drive
Dual-channel
Equivalent
Safety Device
Attribute
Value
Safety inputs
(per channel)
Input current
< 10 mA
Input ON voltage range
18…26.4V DC
Input OFF voltage, max
5V DC
Input ON current
10 mA , each drive
(1)
(1) The maximum number of drives cascaded with safe torque-off wiring is 50.
Input OFF current
2 mA @ V in < 5V DC
Pulse rejection width
700
µ
s
External power supply
SELV/PELV
Input type
Optically isolated and reverse voltage protected
