Safe Torque Off 6-24
AC30V series Variable Speed Drive
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 AC30V should close making the STO function inactive. The AC30V 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 switch (contacts open) that causes the safety control unit to open its output contacts together. In response,
the drive will confirm, by energising KA1 via X10/05, that STO has been invoked. The user may wish / require that this is verified by
mechanisms not shown on this drawing.
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 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.
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