Omron I537-E2-01 User Manual page 172

„
Speed Search Selection
Set whether to enable or disable speed search at start and set the type of speed search (estimated speed or cur-
rent 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 for when speed search at startup and speed search to multi-function input terminals is shown
below.
Run command
Output frequency
Output current
-40
6
Table 6.1 Search Methods
Estimated Speed
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 multi-motor drives, motors two
or more frames smaller than the Inverter capac-
ity.
OFF
ON
Set using
speed detected
0.7 to 1.0 s
Minimum baseblock time (L2-03) x 0.7*
Note: If the stopping method is set to coast to stop and the run command turns ON in a
short time, the operation may be the same as the search in case 2.
Fig 6.29 Speed Search at Startup (Estimated Speed)
Starts speed search from the frequency when
the temporary power loss was detected or from
the highest frequency and performs speed
detection by watching 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.
The motor may accelerate suddenly with light
loads.
Deceleration time set in b3-03
*Lower limit set using Speed Search Wait Time (b3-05)
Current Detection
Set frequency
reference
b 3 -0 2