8.4.5 Instantaneous Power Interruption Settings
If the power interruption time is shorter than 50 ms, the servomotor will continue operation. If it is longer than
50 ms, a power failure during converter drive operation alarm (A.41C) will occur and the servomotor’s power
will be turned OFF.
Note: The time that is treated as an instantaneous power interruption is 50 ms for a Σ-V-SD driver with EtherCAT (CoE)
communications reference. You cannot change this time.
• The holding time of the control power supply (24 VDC) depends on the capability of
the power supply (provision of power supply: user’s responsibility). Check the power
supply before using the application.
• If the load on the servomotor during the power interruption is large, an undervoltage
alarm (A.410) or a converter DC undervoltage alarm (A.41A) may occur.
Instantaneous power interruption
50 ms ≥ OFF time (t)
Instantaneous power interruption
OFF time (t)
Power OFF
50 ms ≥ OFF time (t)
50 ms < OFF time (t)
Main circuit
power supply
Servomotor
status
Power ON
Instantaneous power interruption
50 ms < OFF time (t)
Instantaneous power interruption
Forced OFF
OFF time (t)
Main circuit
power supply
Servomotor
status
Power ON
Operation
continues.
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