5
Appendix
Connection of an external safety relay for STO
Manual – MOVIGEAR
®
B
34
5.3.4
Connection via M12 plug connectors – group disconnection
The following figure shows a connection example for disconnection of group drives
with a safety relay:
X5502
STO
X5503
STO
2
4
4
2
[3]
[4]
X5502
STO
X5503
STO
[3]
[4]
4
2
2
4
[1]
DC +24 V
[2]
9007201723394443
[1] Installation space
[3] MOVIGEAR
®
B
[2] Safety relay
[4] Plug connector for STO
INFORMATION
When wiring the STO signals, possible faults in plug connectors and cables/lines
have to be considered (see EN ISO 13849-2) and the installation has to be designed
according to the required safety class. MOVIGEAR
®
does not detect short circuits in
the supply line. SEW‑EURODRIVE therefore recommends to connect only STO sig-
nals to the STO input using a two-core cable, as shown in the figure.
22746250/EN – 12/2016
