6-28
Safe Torque Off
890CS Common Bus Supply - Frames B & D; 890CD Common Bus Drive and 890SD Standalone Drive - Frames E & F
To start the drive:
Ensure the Safety Demand switch is reset (contacts closed). Press the RESET button to ensure the Safety
Control Unit is reset; its contacts to the 890 should close making the STO function inactive, the 890 STO
output should then turn OFF. Then press the DRIVE START button.
To perform operational stop (non STO):
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.
Operate the Safety Demand (contacts open) that causes the safety control unit to open its output contacts
together. In response, the drive will confirm, by energising KA1 via X11/05, that STO has been invoked.
The user may wish / require that this is verified by mechanisms not shown on this drawing.
DANGER
IF KA1 IS DE-ENERGISED, DO NOT ACCESS THE MACHINE AS A FAULT MAY BE PRESENT.
THE USER MUST RESOLVE THE DETECTED FAULT BEFORE USING THE STO FEATURE.
FAILURE TO DO SO COULD RESULT IN STO NOT BEING ACHIEVABLE, AND THUS THE MOTOR
MAY ROTATE UNEXPECTEDLY AND COULD RESULT IN INJURY, DEATH OR DAMAGE.
PARKER
SSD DRIVES WILL NOT ACCEPT ANY LIABILITY FOR FAILURE TO DO THIS OR FOR ANY
CONSEQUENTIAL LOSS OR DAMAGE.
Note: if either channel of the Safety Demand is requested while the motor is rotating, the motor will coast
to rest unless external forces act on it.