5.2 b: Application
YASKAWA ELECTRIC SIEP C710606 44B YASKAWA AC Drive T1000V Technical Manual 117
The following time chart illustrates how Current Detection Speed Search operates after a momentary power loss:
Figure 5.13
Figure 5.13 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.
Figure 5.14
Figure 5.14 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.
• Current Detection Speed Search is not available when using Open Loop Vector Control for PM motors.
• 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.
■
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 118). With this
setting external Speed Search commands are disregarded.
2. By digital inputs:
The following input functions for H1- can be used.
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
Waits for twice
as long as L2-04
Speed Search operation
current set to b3-02
b3-05
Run command
Output
frequency
Output current
OFF ON
b3-02
Decel time set
set to b3-03
Waits for twice
as long as L2-04
Selected
frequency
reference
Minimum Baseblock Time (L2-03)
Max. output frequency
or the specified
frequency reference
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