At a startup as a result of the RUN command turning ON, the auto search is started after a delay by
the time set at Auto Search Delay Time 1 for Starting Characteristic (3008Hex-32Hex). When control
of a motor is alternately switched between two inverters, and the motor is started by an auto search
after a free run during switching, the RUN command does not need to be issued in a timely manner by
setting Auto Search Delay T
ime 1 for Starting Characteristic (3008Hex-32Hex).
Restart Mode after Momentary Power Failure (Basic Operation:
W
ithout Auto Search Setting)
When the inverter detects that the Main Circuit DC Voltage has dropped below the undervoltage level
during operation, it judges a momentary power failure.
After the restoration of power, the inverter is set to the operation ready completion state once the initial
charging time has elapsed. During a momentary power failure, the power of the external circuit (such
as a relay circuit) controlling the inverter also declines and the RUN command may also turn OFF.
Therefore, when the operation ready state is complete, the inverter waits for two seconds for the RUN
command to be input. If the input of the RUN command is confirmed within two seconds, the inverter
starts restarting according to Power Interruption Restart Mode Selection (3008Hex-0FHex). If the RUN
command is not input, the restart mode after momentary power failure is canceled, and startup is per-
formed from the normal starting frequency
.
Restart start
2s
Power failure time
Gate command ON
Inverter
status
RUN command
Gate OFF
Main Circuit
DC Voltage
Power failure Power restoration
Undervoltage level
Operation ready time
approx. 0.3 to 0.6 s
Operation ready completion
RUN command wait status
ON
ON
During power restoration, the inverter waits for two seconds for the RUN command to be input, but if
the time period set at Allowable Time for Power Interruption Restart (3008Hex-1
1Hex) elapses after
power failure is judged, the two-second long RUN command input waiting state is canceled, and nor-
mal startup is performed.
If the free-run command “FRS” is input during a power failure, Free Run Stop Restart Operation Selec-
tion (H441) is set, and when the RUN command is input, startup is performed from the normal starting
frequency.
As a measure against difficulty in bringing down the Main Circuit DC Voltage during momentary power
failure, if “22: IL (Interlock)” is allocated to Input Terminal [DI1] to [DI7] Function Selection
(3005Hex-02Hex to 3005Hex-06Hex, 3005Hex-63Hex, 3005Hex-64Hex), the momentary power failure
can be detected accurately.
Input signal IL Meaning
OFF Momentary power failure not occurred
ON Momentary power failure occurred (Restart after momentary power failure enabled)
8 Other Functions
8-45
M1 Series EtherCAT Type User’s Manual (I670)
8-4 Restart Functions
8
8-4-2 Restart after Momentary Power Failure
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