1 Both inputs are low. Drive is tripped and STO prevents the drive from starting. User output is ON. This is the "safe torque off" state of the drive.

3 One input is high and the other input is low. Drive is tripped and STO prevents the drive from starting. In this example, this state persists for more

than 3.0 seconds (being the maximum fault detection time), after which time the STO logic transitions to state 4 without further changes in input

state. The inverter has detected a fault or single-channel operation.

4 The fault state (one input high, the other input low) has persisted for longer than 3.0 seconds (being the maximum fault detection time). The STO

hardware logic locks into state 4. The drive is tripped and the STO function prevents the drive from starting. User output is OFF. To exit from state 4,

the drive must be powered off (all power removed including any auxiliary 24Vdc) and back on.

OPERATION OF THE INVERTER UNIT SHOULD CEASE IMMEDIATELY AND THE UNIT SHOULD BE RETURNED TO A PARKER

FURTHER OPERATION OF THE INVERTER WITHOUT RESOLVING THIS FAILURE IS ENTIRELY AT THE USER'S OWN RISK.

SEE SAFETY CATEGORY DEFINITIONS AND LIMITATIONS, REFER TO EN ISO 13849-1:2008.

AC30 series Variable Speed Inverter

24V

OFF

3.0s

DANGER

AUTHORIZED REPAIR CENTRE FOR INVESTIGATION AND REPAIR.

FAILURE TO DO SO COULD RESULT IN INJURY, DEATH OR DAMAGE.

Safe Torque Off