YASKAWA Varispeed E7 Instruction Manual And Parameter Description page 178

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
Calculates the motor speed when the search
starts, and accelerates or decelerates from the
Search Method
calculated speed to the set frequency. The
direction of motor rotation is also detected.
External search command 1 and external
External Speed Search search command 2 become the same operation
Command calculation of the motor speed and starting the
search from the calculated speed.
Cannot be used with multi-motor drives or
Application Precau-
with motors two or more sizes smaller than the
tions
Inverter capacity.
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.
OFF
Run command
Output frequency
Output current
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 6.27 Speed Search at Startup (Calculated Speed)
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
Table 6.1 Search Methods
Speed Calculation
ON
Deceleration time set in b3-03
Starts using
calculated speed
0.7 to 1.0 s *Lower limit set using Speed Search Wait Time (b3-05)
Automatically Restart
set to 61 or 62).
Current Detection
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.
Set frequency
reference
b3-02
41
6-