2 Engineering
2.8 Safe Torque Off (STO)
54 Rapid Link 5 · RAMO5 · RASP5 05/20 MN034004EN www.eaton.com
2.8.4.1 STO installation with RASP5 internal supply voltage (24 V DC)
The two connecting cables from control signal terminal 1 (+24 V) to the
safety relay’s contact and from there back to pin 4 (STO+) must be wired
individually and installed separately (ESC, separate mechanical protection
with two closed cable ducts or two conduits). These two separately wired
single cables must be screened, and the corresponding cable screen must
be earthed (PES).
Pin 1:
Pin 2:
Pin 3:
Pin 4:
24 V DC, output, max. 100 mA
0 V
STO-: 0-V connection to internal control
voltage
STO+:, logical high signal,
Input = 18 - 30 V DC
from the safety controller
Figure 20: STO installation with internal control voltage
PES
Safety relay
PES
2 x2 x
4
3
1
2
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