YASKAWA G7 Series Technical Manual page 281

Speed Search after Short Baseblock (during Power Loss Recovery, etc.)
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 6.43 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
Fig 6.44 Speed Search After Baseblock (Estimated Speed: Loss Time > L2-03)
Current Detection Speed Search
The time charts for current detection speed search is shown below.
Speed Search at Startup
The time chart when speed search at startup or external speed search command is selected is shown below.
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ON OFF
*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).
ON OFF
Minimum baseblock time
Speed Search Wait Time
(L2-03)
(b3-05)
Start using
speed detected
10 ms
Start using speed detected
10 ms
Continuing Operation
Set frequency
reference
Set frequency
reference
63
6-