Safe Torque Off
6-9
890CS Common Bus Supply - Frames B & D; 890CD Common Bus Drive and 890SD Standalone Drive - Frames E & F
is therefore sensitive to voltage polarity.
This output is on (equivalent to closed relay contacts)
when the STO circuit is in the ‘safe’ state, i.e. the drive
will not cause its motor to produce torque.
However, this output should be used primarily as an
indication. In the unlikely event of a fault in the STO
circuit, this output could turn on erroneously to give a false
indication of the STO status. It must not be used as a
guarantee that the motor will not produce torque.
X11/06
STO Status Positive
Together with X11/05, this terminal forms a volt-free
status output. See the description for X11/05.
