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2 Engineering
2.8 Safe Torque Off (STO)
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2.8.6 STO function pick-up time
The total pick-up time for the STO function is the time that elapses from the
moment a safety-relevant event occurs on the system’s components (aggre-
gate) to the moment a safe state is reached (in this case: Stop category 0 as
defined in IEC 60204-1):
• The pick-up time from the moment the STO inputs become de-ener-
gized to the moment when the outputs in the power section (U, V, W)
are in a state in which no torque is produced in the motor (STO function
activated) is less than 1 ms.
• The pick-up time from the moment the STO inputs become de-energized
to the moment the STO monitoring status changes is less than 20 ms.
• The pick-up time from the moment a fault is detected in the STO circuit
to the moment
Sto-F
is signaled is less than 20 ms.
2.8.7 STO function messages
During normal operation (supply voltage present), there are various options
for monitoring the state of the STO inputs.
If the STO inputs are de-energized, the STO LED does not light up and
InHibt
is displayed in the associated operating unit (Inhibit - German: Lock,
locked state).
If the RASP5 variable frequency drive detects a fault, the corresponding fault
code will be displayed (
Sto-F
) (not:
Inhibt
).
2.8.8 Error Messages
The following table lists the error messages relevant to the STO function as
well as potential causes and remedial measures.
Table 8: Error Messages
￫
The STO function is always activated and enabled in the RASP5
speed controller - regardless of the operating mode.
Keypad display LED display STO Meaning
Inhibit
Off there is no release
StOP
Green there is release
Sto-F
- Internal STO fault