YASKAWA FSDrive-MV1000 Parameter Manual page 105

Notes on Using Speed Estimation Speed Search
• Stationary Auto-Tuning for Line-to-Line Resistance (T1-01 = 2) needs to be performed first if you plan to use Speed
Estimation in V/f Control. Perform Stationary Auto-Tuning for Line-to-Line Resistance (T1-01 = 2) again if there is a
change in the cable length between the drive and motor.
• Use Current Detection Speed Search if a high-speed motor of 120 Hz or greater is 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.
• With small-capacity motors of up to 1.5 kW, estimation of motor speed and direction of rotation may not be possible,
and the motor may stop during Speed Estimation.
Activating of Speed Search
■
Speed Search can be activated as described below.
1. Automatically activate Speed Search with every Run command.
Here, external Speed Search commands are ignored.
2. Activate Speed Search using a contact input (External Search Command).
The following input functions for H1-
Setting
61 External Search Command 1
62 External Search Command 2
To activate Speed Search by a contact input, the input must always be set together with the Run command, or the Run
command must be input after the Speed Search command is given.
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 following a fault.
4. After momentary power loss
This mode requires that the Power Loss Ride-Thru function be enabled always or at least enabled during CPU
operation (L2-01 = 1 or 2). For details, refer to
5. After external baseblock is released
The drive will resume the operation starting with Speed Search if the Run command is ON and the output
frequency is above the minimum frequency when the Baseblock command is released.
b3-01: Speed Search Selection at Start
■
Determines if Speed Search is automatically performed when a Run command is issued or not.
No.
b3-01
<1> For details on the default settings, refer to
Setting 0: Disabled
When the Run command is input, the drive starts operating at the minimum output frequency. If external Speed Search 1
or 2 is already enabled by a contact input, the drive will start operating with Speed Search.
Setting 1: Enabled
Speed Search is performed whenever the Run command is input. The drive begins running the motor once Speed Search
is complete.
YASKAWA ELECTRIC EZZ010930 FSDrive-MV1000 Parameter Guide
can be used.
Table 2.7 Speed Search Activation by Contact Inputs
Name
Activate Speed Estimation Speed Search
L2-01: Momentary Power Loss Operation Selection on page
Name
Speed Search Selection at Start
Control Mode Dependent Parameter Default Values on page
Function
Setting Range
0 or 1 Determined by A1-02
79.
2.2 b: Application
198.
Default
<1>
105