6-32 Safe Torque Off
890CS Common Bus Supply - Frames B & D; 890CD Common Bus Drive and 890SD Standalone Drive - Frames E & F
STO Function Checking
Two levels of checking are required. A comprehensive check, and a regular check.
It is for the user / machine builder to determine the frequency of these checks based on their knowledge, use of
the machine, appropriate standards and any legal requirements.
DANGER
ALL TESTS MUST PASS. IF ANY TEST FAILS, IT MUST BE INVESTIGATED AND RECTIFIED
BEFORE ATTEMPTING TO PUT THE EQUIPMENT INTO SERVICE.
FURTHER OPERATION OF THE 890 WITHOUT RESOLVING THIS FAILURE IS ENTIRELY AT
THE USER’S OWN RISK. FAILURE TO DO SO 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.
SEE SAFETY CATEGORY DEFINITIONS AND LIMITATIONS, REFER TO EN ISO 13849-1:2008.
When STO becomes active during any test, power to the motor must be seen by the user to be quenched
instantaneously. Note: the drive should respond in less than 10 milliseconds.
All STO checks should be performed after the 890 has been commissioned for speed control.
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