2 Engineering
2.10 STO function
64 DA1 Variable Frequency Drives 11/16 MN04020005Z-EN www.eaton.com
• The pick-up time from the moment the STO inputs (control signal
terminals 12 and 13) 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 (fault indicator, digital output) is less
than 20 ms.
2.10.6 STO function parameters
During normal operation (supply voltage present), there are various options
for monitoring the STO inputs’ (control signal terminals 12 and 13) state.
If the STO inputs are de-energized:
• The corresponding operating unit will display InHibit.
Exception: If the DA1 variable frequency drive detects a fault, the
corresponding fault code will be displayed (not: InHibit)
• Relay RO1 will be switched off if parameter P2-15 is set to 13
(changeover contact: 14-16 = open, 14-15 = closed)
• Relay RO2 will be switched off if parameter P2-18 is set to 13
(N/O: 17-18 = open).
￫
The STO function is always activated and enabled in DA1
variable frequency drives – regardless of the operating mode or
of parameter changes made by the user.
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