
6-26
Safe Torque Off
890CS Common Bus Supply - Frames B & D; 890CD Common Bus Drive and 890SD Standalone Drive - Frames E & F
To run the drive:
Ensure the STO Request contacts are closed.
Press the DRIVE START button.
To perform operational (not STO) stop:
Press the DRIVE STOP button.
Wait for the motor to come to rest.
To invoke STO:
Press the DRIVE STOP button.
Wait for the motor to come to rest.
Open the STO Request contacts simultaneously.
The contacts must remain open for the entire
duration that STO is required, they must not be
momentary action switches. The drive will confirm
via X11/05 that STO has been invoked by the lamp
being ON.
If the lamp is OFF, do not access the machine as a
fault may be present.
Note: if the STO Request contacts open while the
motor is rotating, the motor will coast to rest
(unless external forces act on it).
X15/02 X15/03 X11/01 X11/03 X11/06 X14/03
DRIVE
START
DRIVE
STOP
STO
REQUEST
890 STO
X11/02 X11/04 X11/05 X14/04
24VDC
Minimum STO Implementation
This example shows the minimum connections required. To reset from STO requires that STO Request contacts
are closed to permit normal drive operation. The user must do a risk assessment to ensure that all safety
requirements are met. The user must select and
assess appropriate equipment.
Note: all wiring shown is within the control cubicle.