6-58
6
îš„Speed Calculation
Search at Startup
The time chart for when speed search at startup and speed search to multi-function input terminals is shown
below.
Fig 6.58 Speed Search at Startup (Calculated Speed)
Speed Search after Power Loss
• Loss Time shorter than the Minimum Baseblock Time (L2-03)
Fig 6.59 Speed Search after Power Loss with Loss Time < L2-03
•
Loss Time longer than the Minimum Baseblock Time (L2-03)
Fig 6.60 Speed Search after Power Loss with Loss Time > L2-03
OFF
ON
Run command
Output frequency
Output current
0.7 to 1.0 s
Minimum baseblock time (L2-03) x 0.7*
Deceleration time set in b3-03
b3-02
*
Lower limit set using Speed Search Wait Time (b3-05)
Set frequency refer-
ence
Note:If the stopping method is set to coast to stop, and the run command turns ON in a short time, the operation may be the
same as the search in case 2.
Starts using
calculated speed
AC power supply
ON
OFF
Output current
Minimum baseblock time (L2-03) x 0.75
10 ms
Start using
speed detected
Set frequency
reference
After AC power supply recovery, the inverter waits for the
minimum Speed Search Wait Time (b3-05).
Output frequency
Set frequency
reference
Minimum baseblock time
(L2-03)
Speed Search Wait Time
(b3-05)
Note: If the frequency immediately before the baseblock is low or the power supply break time is long, operation may be the
same as the search in case 1.
AC power supply
ON
OFF
Output frequency
Output current
Start using speed detected
10 ms
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