Allowable Time for Power Interruption Restart (H16)
Set the maximum time from when a momentary power failure (undervoltage level) occurs until a restart
is performed (setting range: 0.0 to 30.0 s). If the setting range is exceeded, the restart after
momentary power failure is not performed, and operation is performed by turning ON the power again.
Normal operation start
Power failure time
Gate command ON
Inverter status
RUN command
(Case 2)
Main Circuit
DC Voltage
Power failure Power restoration
Undervoltage level
Operation ready time
approx. 0.3 to 0.6 s
Operation ready completion
ON
ON
ON
ON
H16
Restart start
RUN command
(Case 1)
If Allowable Time for Power Interruption Restart (H16) is set to “999,” restart after momentary power
failure is performed until the Main Circuit DC Voltage drops down to the allowable voltage for restart
after momentary power failure, and once it becomes equal to or below the allowable voltage for restart
after momentary power failure, it is judged that the power supply is cut off, the restart after momentary
power failure is not performed, and the operation is performed by turning the power ON again.
Power supply system
Allowable voltage for restart after momentary pow-
er failure
200 V 50 V
400 V 100 V
Power Interruption Restart Wait Time (H13)
Set the time from after the occurrence of momentary power failure until the inverter restarts (Auto
Search Delay Time 2 for Starting Mode (H46) is used during auto search setting). If the inverter is
started in a state when the residual voltage of the motor is high, the inrush current may increase, there
may be a temporary regeneration, and an overvoltage alarm may occur. For safety, adjust Power Inter-
ruption Restart W
ait Time (H13) so that restart is performed after the residual voltage becomes low to
an extent.
7 Other Functions
7-55
M1 Series Standard Type User's Manual (I669)
7-4 Restart Functions
7
7-4-2 Restart after Momentary Power Failure
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