2 Engineering
2.10 STO function
62 DA1 Variable Frequency Drives 11/16 MN04020005Z-EN www.eaton.com
STO installation with internal DA1 supply voltage (24 V DC)
The connecting cable from control signal terminal 1 (+24 V) to the safety
relay’s contact and the connecting cable from the safety relay’s contact to
control signal terminal 12 (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 earthed (PES).
￫
In addition to the wiring guidelines for an installation meeting
EMC requirements ( Section 3.5, „EMC installation“, page
83), 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
installation).
• The 24 VDC power supply for the STO inputs can be
supplied from the DA1’s internal 24 VDC voltage or from an
external 24 VDC power supply.
• Accordingly, the DA1 variable frequency drive should be
wired as described below:
Control signal terminals
1:
7 or 9:
12:
13:
24 V DC, output, max. 100 mA
0V
STO+, logical high signal,
input = 18 - 30 VDC
from the safety controller
STO-, 0-V connection to internal control
voltage (terminal 7 or 9)
Figure 34:STO installation with internal control voltage
123456789101112 13
PES
eks
eks
Safety relay
2 x
PES
2 x
To Next Page
Loading...
