When the motor speed drops during momentary power failure and startup is performed from the fre-
quency prior to the momentary power failure after the power is restored, the current limitation function
is activated, and the output frequency of the inverter declines automatically. When the output frequen-
cy and the motor rotation speed are synchronous, acceleration is performed up to the original output
frequency
.
However, the momentary overcurrent limitation must be enabled (Instantaneous Overcurrent Limiting
Function Selection (3008Hex-0DHex) = 1) for the synchronous pull-in of the motor.
In the case of the set frequency
(301FHex-35Hex= 2)
Power restorationPower failure
Auto-restarting after momentary
power failure “IPF”
Time
Undervoltage
During undervoltage “UV”
Main Circuit
DC Voltage
Output frequency
(motor rotation speed)
Time
Time
Time
0
Acceleration
Synchronization
O
N
ON
3004Hex-0FHex=4
Restart Mode after Momentary Power Failure (Basic Operation:
With Auto Search Setting)
The auto search operation does not operate normally if residual voltage is remaining in the motor.
Therefore, it is necessary to secure time for the residual voltage to dissipate.
The required time for restart after momentary power failure is secured by Auto Search Delay Time 2
for Starting Mode (3008Hex-2FHex).
8 Other Functions
8-46
M1 Series EtherCAT Type User’s Manual (I670)
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