Yaskawa Matrix Converter User Manual Page 224

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Continuing Operation
6-59
Speed Search
The speed search function finds the actual speed of the motor that is rotating using inertia, and then starts
smoothly from that speed. When restoring power after a temporary power loss, the speed search function
switches connection from the commercial power supply, and then restarts the fan that is rotating using inertia.
Related Parameters
Parameter
Number
Name
Description
Setting
Range
Default
Change
during
Run
Control Methods
Display
V/f
Open
Loop
Vector
Flux
Vector
b3-01
Speed Search
Selection
Enables/disables the speed search function for
the Run Command and sets the speed search
method.
0: Disabled, speed calculation
1: Enabled, speed calculation
2: Disabled, current detection
3: Enabled, current detection
Speed Calculation:
When the search is started, the motor speed is
calculated and acceleration/deceleration is
performed from the calculated speed to the
specified frequency (motor direction is also
searched).
Current Detection:
The speed search is started from the fre-
quency when power was momentarily lost
and the maximum frequency, and the speed is
detected at the search current level.
0 to 3
*1
0NoAANo
SpdSrch at Start
b3-02
Speed Search
Deactivation Cur-
rent
Used only when b3-01 = 2 or 3. Sets speed
search operating current in units of percent,
with MxC rated current as 100%.
Note: Normally not necessary to change. If
the MxC won’t run after a restart, lower
this value.
0 to
200
100%
*2
No A A No
SpdSrch Current
b3-03
Speed Search
Deceleration Time
Used only when b3-01 = 2 or 3. Sets the
deceleration time during speed search.
0.1 to
10.0
2.0 s No A A No
SpdSrch Dec Time
b3-04
*4
Current Suppres-
sion Gain During
Search
Sets the gain used to suppress output current
during a current detection speed search.
If resistor overheat (SOH) occurs, reduce the
setting.
10 to
100
100%
*3
No A A No
SpdSrch I Gain
b3-05
Speed Search
Delay Time
Delays the speed search operation after a
momentary power loss to allow time for an
external output contactor to re-energize.
0.0 to
20.0
0.2 s No A A A
Search Delay
b3-10
Speed Search
Detection Com-
pensation Gain
Sets the gain for the frequency at which the
MxC starts speed estimation speed search.
Use only when b3-01 = 0 or 1.
1.00 to
1.20
1.15 No A A No
Srch Detect Comp
b3-14
Bi-directional
Speed Search
Selection
This parameter enables the MxC to detect the
direction of rotation of the motor during speed
search.
0: Disable - MxC uses frequency reference
direction.
1: Enable - MxC uses detected direction
0 or 1 0 No A A No
Bidir Search Sel
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