6
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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.
Fig 6.18 Speed Search at Startup (Using Current Detection)
Speed Search after Short Baseblock
The time chart when the Inverter operation is restarted after power has been restored is shown below.
•
Loss Time Shorter Than Minimum Baseblock Time
Fig 6.19 Speed Search After Baseblock (Current Detection: Loss Time < L2-03)
•
Loss Time Longer Than Minimum Baseblock Time
Fig 6.20 Speed Search After Baseblock (Current Detection: Loss Time > L2-03)
Run Command
Output frequency
Output current
Off
On
b3-02
Deceleration time set in b3-03
Set frequency
reference
Minimum baseblock time
(L2-03)
Maximum output
frequency or
set frequency
* Lower limit is set using Speed Search Time (b3-05).
*
Main circuit power
supply
Output frequency
Output current
Off
On
Output frequency before power loss
Set frequency
reference
Minimum baseblock time (L2-03)
*1 Baseblock time may be reduced by the output frequency
immediately before baseblock.
*2 After main circuit power supply recovery, motor waits for
the minimum Speed Search Wait Time (b2-03).
Deceleration
time set in b3-03
b3-02
speed search operating current
*2
*1
Output frequency
Output current
Off
On
Output frequency before power loss
Set frequency
reference
Minimum baseblock time
(L2-03)
Deceleration speed set in b3-03
b3-02
Speed search operating time
Speed search wait time (b3-05)
Main circuit power
supply
