YASKAWA E7U Programming Manual page 20

IMPORTANT
If an OC fault occurs when Speed Search is attempted after power loss recovery, increase the setting of L2-03.
OFF
Run command
Maximum output
frequency or
set frequency
Output frequency
Output current
Minimum baseblock time
(L2-03)
AC power supply
Output frequency
Output current
Minimum baseblock time (L2-03)
Fig. 13 Speed Search (Current Detection Method) after momentary power loss where the power loss
AC power supply
Output frequency
Output current
Fig. 14 Speed Search (Current Detection Method) after momentary power loss where the power loss
Setting of Automatic Speed Search for
b3-01 all RUN commands
0
1 Yes - Speed Estimation
2
3 Yes - Current Detection
ON
Deceleration time set in b3-03
*
Fig. 12 Speed Search (Current Detection Method) at Startup
ON OFF
Output frequency before power loss
*1
*2
time is less than the minimum baseblock time
ON OFF
Minimum baseblock time
(L2-03)
time exceeds the minimum baseblock time
No
No
Programming 14
Set frequency
reference
* Lower limit is set using Speed Search Time (b3-05).
Deceleration
time set in b3-03
b3-02
speed search operating current
*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).
b3-05
Output frequency before power loss
Deceleration speed set in b3-03 Deceleration time set in b3-03
Speed search operating time
Speed search wait time (b3-05)
Automatic Speed Search
after momentary power
loss and baseblock
Yes - Speed Estimation
Yes - Speed Estimation
Yes - Current Detection
Yes - Current Detection
Speed search current level
b3-02
Search Delay Time (b3-05).
Set frequency
reference
Set frequency
reference
b3-02
Speed Search Used for
Run with programmed
multi-function input
Yes - Speed Estimation
Yes - Speed Estimation
Yes - Current Detection
Yes - Current Detection