Omron VARISPEED E7 User Manual page 179

Speed Search Selection
The speed search method can be selected using b3-01. If b3-01 is set to 0 the search method is speed calcula-
tion. It has to be activated by a multi-function input (H1-
If b3-01 is set to 1, the search method is speed calculation too, but speed search is performed at every RUN
command and has not to be activated by a multifunction input.
The same is valid for setting b3-01 to 2 or 3, only the search method is current detection and not speed calcu-
lation.
Search Name
Search Method
External Speed Search
Command
Application Precautions
Speed Calculation
Search at Startup
The time chart for when speed search at startup and speed search to multi-function input terminals is shown
below.
6
Run command
Output frequency
Output current
40
6-
Speed Calculation
Calculates the motor speed when the search starts,
and accelerates or decelerates from the calculated
speed to the set frequency. The direction of motor
rotation is also detected.
External search command 1 and external search
command 2 become the same operation calculation
of the motor speed and starting the search from the
calculated speed.
Cannot be used with multi-motor drives or with
motors two or more sizes smaller than the Inverter
capacity.
OFF
ON
Starts using
calculated speed
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 6.28 Speed Search at Startup (Calculated Speed)
set to 61 or 62).
Starts speed search from the frequency when the
temporary power loss was detected, or from the high-
est 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 fre-
quency.
External speed search command 2:
Starts speed search from the frequency reference 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 ref-
erence
b3-02