Sto Status Indications - ABB ACS355 User Manual

STO inputs have been energized, and any of the drive reactions have been reset.
Drive event can be parametrized according to the table below.
Parameter
3025 STO
OPERATION
If the operation delay between the inputs is excessive or only one STO input is de-
energized, an event is always considered a fault
event cannot be changed. De-energizing of only one STO input is not considered
normal operation since the safety integrity level would decrease if only one channel is
used.

STO status indications

When both STO inputs are energized, the STO function is in the standby state and
the drive operates normally. If either of the STO inputs or both are de-energized, the
STO function is executed in a safe manner and corresponding reaction is updated
according to the table below.
STO event Fault name
Fault 0044 SAFE TORQUE
OFF
Fault 0045 STO1 LOST
Fault 0046 STO2 LOST
Alarm 2035 SAFE TORQUE
OFF
Selection values
(1) ONLY FAULT
(2) ALARM&FAULT
(3) NO & FAULT
Default:
(4) ONLY ALARM
STO functions correctly and the
fault must be reset before starting.
STO input channel 1 has not de-
energized, but channel 2 has.
Opening contacts on channel 1
might have been damaged or there
is a short circuit.
STO input channel 2 has not de-
energized, but channel 1 has.
Opening contacts on channel 2
might have been damaged or there
is a short circuit.
STO functions correctly.
Appendix: Safe torque off (STO) 401
Explanation
Drive event on successful STO operation is fault
SAFE TORQUE OFF. The fault bit is updated.
Drive event on successful STO operation is alarm
SAFE TORQUE OFF
TORQUE OFF when running. Fault and alarm bits
are updated.
Drive event on successful STO operation is no alarm
when stopped and fault
running. The fault bit is updated.
Drive event on successful STO operation is alarm
SAFE TORQUE OFF. The alarm bit is updated. Start
command must be toggled to continue running the
drive.
(STO1 LOST
Description
when stopped and fault
SAFE TORQUE OFF
or STO2 LOST). This
Status
0307 FAULT WORD 3
bit 4
0307 FAULT WORD 3
bit 5
0307 FAULT WORD 3
bit 6
0309 ALARM WORD 2
bit 13
SAFE
when