Parker LINKnet AC30P, Hardware Installation Manual

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8-24
Safe Torque Off
AC30 series Variable Speed Inverter
To invoke SS1:
Operate the Safety Demand switch (contacts open). This should cause the Safety Control Unit to open its instantaneous output, shown
here as a single channel. This causes the drive to decelerate to rest using its own software which is not safety critical in this instance.
Note: the drive’s block diagram must be configured to provide this ramp to rest functionality.
After a time delay set in the Safety Control Unit, the pair of delayed OFF output contacts open together. This time delay must be set
longer than the worst case time for the motor to come to rest.
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.
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 RELYING FURTHER ON 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 of the delayed OFF output contacts in the Safety Control Unit open while the motor is rotating, the motor will coast to rest
(unless external forces act on it).