QSHT 5700 Inverter Safe Torque-off Function
Hardwired Safe Torque-off
278
MagneMotion
Rockwell Automation Publication MMI-UM007F-EN-P - September 2020
Cascade the Safe Torque-off Signal
The total number of QSHT 5700 inverters in a single cascaded safety circuit is limited by the
current carrying capacity of the cascaded safety wiring. See
for current rating per
channel, per inverter.
In this example, the cascaded safe torque-off (STO) wiring is for an application with three
QSHT 5700 inverters and two separate safety devices.
Figure 7-9: Cascaded STO Wiring - Dual Inverters with Two Safety Devices
In this example, the cascaded STO wiring is for an application with three QSHT inverters and
a single safety device for all inverters.
Figure 7-10: Cascaded STO Wiring - Dual Inverter with Single Safety Device
SB+/NC
S1A
SCA
S2A
SB-
S1B
SCB
S2B
SB+/NC
S1A
SCA
S2A
SB-
S1B
SCB
S2B
24V DC
SB+/NC
S1A
SCA
S2A
SB-
S1B
SCB
S2B
1
2
12
3
4
5
6
7
8
9
10
11
13
14
15
16
1
2
12
3
4
5
6
7
8
9
10
11
13
14
15
16
1
2
12
3
4
5
6
7
8
9
10
11
13
14
15
16
24V DC
SB+/NC
S1A
SCA
S2A
SB-
S1B
SCB
S2B
SB+/NC
S1A
SCA
S2A
SB-
S1B
SCB
S2B
SB+/NC
S1A
SCA
S2A
SB-
S1B
SCB
S2B
1
2
12
3
4
5
6
7
8
9
10
11
13
14
15
16
1
2
12
3
4
5
6
7
8
9
10
11
13
14
15
16
1
2
12
3
4
5
6
7
8
9
10
11
13
14
15
16