AC 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
Speed Search operation
current set to b3-02
b3-05
Waits for L2-04 x 2 time
Figure 5.15 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.
Run command
Output
frequency
Output current
OFF ON
b3-02
Decel time
set to b3-03
Selected
frequency
reference
Minimum Baseblock Time (L2-03)
Max. output frequency
or the specified
frequency reference
Waits for L2-04 x 2 time
Figure 5.16 Current Detection Speed Search at Start or External Speed Search
Note: When the Run command is set the drive waits until the Speed Search Wait Time (b3-05) before Speed Search is performed, even if the
Minimum Baseblock Time is set to smaller values than b3-05.
Notes on Using Current Detection Type Speed Search
• Increase the voltage recovery ramp time set to L2-04 if a Uv1 fault occurs when performing Current Detection Speed Search.
• Shorten the Speed Search deceleration time set to b3-03 if an oL1 fault occurs while performing Current Detection Speed
Search.
• Increase the minimum baseblock time set to L2-03 if an overcurrent fault occurs when performing Speed Search after power
is restored following a momentary power loss.
n
Activation of Speed Search
Speed Search can be activated as described below. Independent of the activation method the Speed Search type must be selected
in parameter b3-24.
1. Automatically at every Run command (
Refer to b3-01: Speed Search Selection at Start on page 127). With this setting
external Speed Search commands are disregarded.
2. By digital inputs:
The following input functions for H1-oo can be used.
5.2 b: Application
126
YASKAWA TOEP YAIQPM 03B YASKAWA AC Drive - iQpump Micro User Manual
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