Automatically Restart
6
-
41
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-
set to 61 or 62).
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.
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.
Fig 6.27 Speed Search at Startup (Calculated Speed)
Table 6.1 Search Methods
Search Name
Speed Calculation
Current Detection
Search Method
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.
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
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.
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.
Application Precau-
tions
Cannot be used with multi-motor drives or
with motors two or more sizes smaller than the
Inverter capacity.
The motor may accelerate suddenly with light
loads.
OFF
ON
Run command
Output frequency
Output current
0.7 to 1.0 s
Minimum baseblock time (L2-03) x 0.7*
Deceleration time set in b3-03
b3-02
*Lower limit set using Speed Search Wait Time (b3-05)
Set frequency
reference
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.
Starts using
calculated speed
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