Connecting
4.4 24 V power supply/STO
SINAMICS V90, SIMOTICS S-1FL6
162
Operating Instructions, 04/2019, A5E36037884-007
4.4
24 V power supply/STO
Pin assignment
Interface
Signal name
Description
Remarks
STO 1
Safe torque off channel 1
-
STO +
Power supply for safe torque off
-
STO 2
Safe torque off channel 2
-
+24 V
Power supply, 24 V DC
Voltage tolerance:
•
Without brake: -15% to +20%
•
With brake: -10% to +10%
Maximum current consumption:
•
Without brake: 1.6 A
•
With brake: 1.6 A + motor holding brake
rated current (See Section "Technical
data - servo motors (Page 68)")
M
Power supply, 0 V DC
Maximum conductor cross-section: 1.5 mm
2
Wiring
WARNING
Material damages and personal injuries by the drop of a hanging axis
When the servo system is used as a hanging axis, the axis will drop if the positive and
negative poles of the 24 V power supply are connected inversely. Unexpected drop of the
hanging axis can cause material damages and personal injuries.
•
Make sure that the 24 V power supply is correctly connected.
WARNING
Material damages and personal injuries by the drop of a hanging axis
Unexpected drop of the hanging axis can cause material damages and personal injuries.
•
It is not allowed to use the STO with a hanging axis because the axis may drop.
Note
Using the STO function
The STO1, STO+ and STO2 are short connected at the factory setting.
When the STO function is to be used, you must remove the short-circuit stick before
connecting the STO interfaces. The safety function of the servo drive is SIL 2 (EN61800-5-
2). If you do not need to use it any more, you must reinsert the short-circuit stick; otherwise,
the motor will not run.
For detailed information about the STO function, refer to "Safety Integrated basic functions
(Page 309)".