YASKAWA FSDrive-MV1S Instructions Manual page 164

Speed Search Selection
Set whether to enable or disable speed search at startup, and set the type of speed search (estimated speed or
current detection) using setting b3-01. To perform speed search when inputting the Run Command, set b3-01
to 1 or 3.
Search Name
Search Method
External Speed Search
Command
Application Precau-
tions
Estimated Speed Search
The time chart for estimated speed searches is shown below.
Search at Startup
The time chart when speed search at startup or external speed search command of multi-function inputs has
been selected is shown below.
Run Command
Output frequency
Output current
Note: If the stopping method is set to coast to stop, and the Run Command turns ON in a short time,
-40
6
Estimated Speed (b3-01 = 0 or 1)
Estimates the motor speed when the search
starts, and accelerates and decelerates from the
estimated speed to the set frequency. You can
also search including direction of motor rota-
tion.
External search command 1 and external
search command 2 become the same operation,
estimating the motor speed and starting the
search from the estimated speed.
Cannot be used motors two or more frames
smaller than the Inverter capacity.
Off On
Start using
speed detected
1.0 s
Minimum baseblock time (L2-03) × 0.7*
the operation may be the same as the search in case 2.
Fig 6.15 Speed Search at Startup (Estimated Speed)
Current Detection (b3-01 = 2 or 3)
Starts speed search from the frequency when
the temporary power loss was detected, or from
the highest frequency, and performs speed
detection at the current level during the search.
External speed search command 1:
Starts speed search from the maximum output
frequency.
External speed search command 2:
Starts speed search from the frequency refer-
ence set before the search command.
In control method without PG, the motor may
accelerate suddenly with light loads.
* Lower limit set using Speed Search Wait Time (b3-05).
Set frequency
reference
b3-02