6
-42
Current Detection Speed Search
Speed Search at Startup
The time chart when speed search at startup or external speed search command is selected is shown below.
Fig 6.32 Speed Search at Startup (Using Current Detection)
Speed Search after Short Baseblock (during Power Loss Recovery, etc.)
•
Loss Time Shorter Than Minimum Baseblock Time
Fig 6.33 Speed Search After Baseblock (Current Detection: Loss Time < L2-03)
•
Loss Time Longer Than Minimum Baseblock Time
Fig 6.34 Speed Search After Baseblock (Current Detection: Loss Time > L2-03)
OFF
ON
Run command
Output frequency
Output current
* Lower limit is set using Speed Search Time (b3-05).
Deceleration time set in b3-03
b3-02
Set fequency
reference
Maximum output
frequency or
set frequency
Minimum baseblock time*
(L2-03)
OFF
ON
AC power supply
Output frequency
Output current
Set fequency
reference
Minimum baseblock time (L2-03)*1
*2
Output frequency before power loss
speed search operating current
Deceleration time
set in b3-03
*1
Baseblock time may be reduced by the output
frequency immediately before baseblock.
*2
After AC power supply recovery, motor waits for
the minimum Speed Search Wait Time (b2-03).
b3-02
Minimum baseblock time*
(L2-03)
OFF
ON
AC power supply
Output frequency
Output current
Set fequency
reference
Speed search operating time
b3-02
Deceleration speed set in b3-03
Output frequency before power loss
Speed search wait time (b3-05)
