Eaton Rapid Link RAMO5, Manual

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2 Engineering
2.8 STO function
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2.8.3.1 STO installation with internal RASP5 internal supply voltage (24 V DC)
The connecting cable from control pin 1 (+24 V) to the safety relay’s contact
and from there back to the pin 4 (STO+) must be wired individually and
installed separately (eks, 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 grounded (PES).
￫
In addition to the wiring guidelines for an installation meeting
EMC requirements (), the following requirements must be
observed as well for the “STO wiring”:
• The STO-compatible installation must be protected against
short-circuits and tampering. The cables in the STO circuit
can be mechanically protected with a closed cable duct or
with a conduit (eks = ground and short-circuit-safe installa-
tion).
• The 24-V-DC power supply of the STO inputs can occur
from the internal 24-V-DC voltage of the RASP5 variable fre-
quency drive or from an external 24-V-DC power source
(External Power Supply).
The RASP5 variable frequency drive should be wired as
described below.
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 x 2 x
4
3
1
2