2 Engineering
2.10 STO function
DA1 Variable Frequency Drives 11/16 MN04020005Z-EN www.eaton.com 63
STO installation with external supply voltage (24 V DC)
The two connecting cables going from the external control voltage and the
safety relay to control signal terminals 12 (STO+) and 13 (STO-) must be
twisted.
This twisted pair must be routed inside a closed cable duct or conduit (eks)
and must also be screened, with the corresponding cable screen being
earthed (PES).
The external control voltage should meet the following specifications:
2.10.5 STO function pick-up time
The total pick-up time for the STO function is the time that elapses from the
moment a safety-relevant event occurs on the system’s components
(aggregate) to the moment a safe state is reached (in this case: Stop
category 0 as defined in IEC 60204-1):
• The pick-up time from the moment the STO inputs (control signal
terminals 12 and 13) become de-energized to the moment when the
outputs in the power section (U, V, W) are in a state in which no torque
is produced in the motor (STO function activated) is less than 1 ms.
Control signal terminals
12:
13:
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 35:: STO installation with external control voltage
+24 V DC
100 mA
External Power
Supply
0 V
123456789101112 13
PES
eks
Safety relay
eks
PES
Rated control voltage 24 V DC
Voltage for the logical STO high signal
18 - 30 V DC
Current carrying capacity
100 mA
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