YASKAWA Varispeed G7 Series Instruction Manual page 303

Speed Search after Short Baseblock (during Power Loss Recovery, etc.) (b3-01 = 0)
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)
•
AC power supply
Output frequency
Output current
Minimum baseblock time (L2-03) x 0.75*1
Fig 6.46 Speed Search after Baseblock (When Estimated Speed: Loss Time Is Set in L2-03)
Loss Time Longer Than the Minimum Baseblock Time (L2-03)
•
AC power supply
Output frequency
Output current
-70
6
ON
ON
Minimum baseblock time
(L2-03)
Fig 6.47 Speed Search After Baseblock (Estimated Speed: Loss Time > L2-03)
OFF
Start using
speed detected
10 ms
*1 Baseblock time may be reduced by the output frequency
*2 immediately before the baseblock.
*2 After AC power supply recovery, motor waits for the
minimum Speed Search Wait Time (b3-05).
OFF
Start using speed detected
10 ms
Speed Search Wait Time
(b3-05)
Set frequency
reference
Set frequency
reference