YASKAWA OYMC V1000

1.2 b: Application
YASKAWA ELECTRIC SIEP C710606 10A YASKAWA AC Drive - V1000 PRELIM. Programming Manual 53
Parameter Details
1
will cause a high current. The closer the output frequency comes to the rotor speed, the
lower the current draw will be. When the output current drops below the level as set in b3-
02, the output frequency stops decreasing and normal operation resumes.
The following time chart illustrates how Current Detection Speed Search operates after a
momentary power loss:
Figure 1.15
Figure 1.15 Current Detection Speed Search after Power Loss
Note: After power is restored, the drive waits until the time set to b3-05 has passed before performing
Speed Search. Thereby the Speed Search may start not at the end of L2-03 but even later.
When Speed Search is applied using an external Search command or automatically with the
Run command, the drive waits for the minimum baseblock time L2-03 before Speed Search
is started. If L2-03 is smaller than the time set in parameter b3-05, b3-05 is used as the wait
time.
A
C power
supply
Output
frequency
Output
current
OFFON
Output frequency before
momentary power loss
Selected
frequency
reference
Min. Baseblock Time (L2-03)
Decel time
set to b3-03
Waits for twice
as long as L2-04
Speed Search operation
current set to b3-02
b3-05