Yaskawa F7 Drive Programming Manual - Manual (Page 24)

Programming 16
Fig. 12 Speed Search (Current Detection Method) at Startup
Fig. 13 Speed Search (Current Detection Method) -
after momentary power loss where the power loss time is less than the minimum baseblock time
Fig. 14 Speed Search (Current Detection Method) -
after momentary power loss where the power loss time exceeds the minimum baseblock time
Note: When parameter A1-02 = 0 (V/f control without PG) or 2 (open loop vector) the factory default setting is 2.
When parameter A1-02 = 1 (V/f control with PG) the factory default setting is 3.
Speed Search Settings and Methods
Setting of b3-01 Automatic Speed Search at RUN command
Speed Search Method Used for
Multi-function inputs, momentary power loss,
baseblock, fault retry
0 No Yes - Speed Estimation
1 Yes - Speed Estimation Yes - Speed Estimation
2 No Yes - Current Detection
3 Yes - Current Detection Yes - Current Detection
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). * Search Delay Time (b3-05).
Speed search current level
AC 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 AC 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
b3-05
AC power supply
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)
Deceleration time set in b3-03