2.2 b: Application
YASKAWA ELECTRIC
TOEP C710687 03B FSDrive-MV1000 Parameter Guide
111
Figure 2.13
Figure 2.13 Speed Search at Start
Notes on Using Speed Estimation Speed Search
• Perform Stationary Auto-Tuning for Line-to-Line Resistance (T1-01 = 2) first when planning to use Speed Estimation
in V/f Control. Perform Stationary Auto-Tuning for Line-to-Line Resistance again if there is a change in the cable
length between the drive and motor.
• Speed Estimate Type Speed Search cannot be used if the application is running multiple motors from the same drive or
if the motor capacity is considerably smaller than the capacity of the drive.
• Speed Estimation may have trouble finding the actual speed if the motor cable is very long.
n
Activating of Speed Search
Speed Search can be activated as described below:
Method 1.
Automatically activate Speed Search with every Run command. External Speed Search commands are
ignored.
Method 2.
Activate Speed Search using the contact inputs (External Search Command). Use the input functions for
H1-
in
.
Table 2.7 Speed Search Activation by Contact Inputs
To activate Speed Search by a contact input, the input must be set together with the Run command, or the Run command
must be input after giving the Speed Search command.
Method 3.
After automatic fault restart.
When the number of maximum fault restarts in parameter L5-01 is set higher than 0, the drive will automatically perform
Speed Search as specified by b3-24 following a fault.
Method 4.
After momentary power loss ride-thru.
This mode requires that the Power Loss Ride-Thru function is enabled during CPU operation (L2-01 = 1 or 2).
L2-01: Momentary Power Loss Ride-Thru Operation Selection on page 203
for details.
Method 5.
After external baseblock is released.
The drive will resume the operation starting with Speed Search if the Run command is present and the output frequency
is above the minimum frequency when the Baseblock command is released.
Setting
Name
Function
61
External Search Command 1
Activate Speed Estimation Speed Search
62
External Search Command 2
Run command
Output
frequency
Output
current
OFF
ON
b3-02
Starts at the speed
speed that was detected
Waits twice as long as L2-04
Frequency reference
set to the drive
Decelerates at the Speed
Search decel time set to b3-03
1.0 s
Min. Baseblock Time (L2-03)
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