YASKAWA FSDrive-MV1S Instructions Manual page 165

Speed Search after Short Baseblock (during Power Loss Recovery, etc.)
The time chart when the Inverter operation is restarted after power has been restored is shown below.
Loss Time Shorter Than the Minimum Baseblock Time (L2-03)
•
Main circuit
power supply
Output frequency
Output current
Minimum baseblock time (L2-03) x 0.75*1
Fig 6.16 Speed Search after Baseblock (When Estimated Speed: Loss Time Is Set in L2-03)
Loss Time Longer Than the Minimum Baseblock Time (L2-03)
•
Main circuit
power supply
Output frequency
Output current
Fig 6.17 Speed Search After Baseblock (Estimated Speed: Loss Time > L2-03)
On Off
Start using
speed detected
10 ms
*1 Baseblock time may be reduced by the output frequency
*2
immediately before the baseblock.
*2 After Main circuit power supply recovery, motor waits for the
minimum Speed Search Wait Time (b3-05).
On Off
Minimum baseblock time
Speed Search Wait Time
(L2-03)
(b3-05)
Continuing Operation
Set frequency
reference
Start using speed detected
Set frequency
reference
10 ms
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