• 0 ≤ t < b3-50: The search is started in the direction specified by the direction command.
• b3-50 ≥ t < b3-51: The motor is not restarted and the baseblock continues.
The search starts from the opposite direction of the direction command when the momentary power loss time exceeds the
setting value of b3-51.
• b3-51 ≤ t: The search is started in the direction opposite to the direction command.
Refer to b3-50/b3-51: Backspin Search Direction Judgment Time 1/2 on page 203
for details on the backspin direction
judgment time.
Note:
1.
Set b3-50 to the required time to enable rotation direction detection for backspin.
2.
When setting b3-50, be sure to also set the following parameters to the values specified. Setting these parameters to any other values
will trigger an oPE08 fault.
b3-50 ≤ b3-51
b3-14 = 0
b3-24 = 2
3.
Backspin detection is not necessary with a PM motor or in Closed Loop Vector control mode.
n
b3-01: Speed Search Selection at Start
Determines if Speed Search is automatically performed when a Run command is issued.
No.
Parameter Name
Setting Range
Default
b3-01
Speed Search Selection at Start
0, 1
Determined by
A1-02
Setting 0: Disabled
This setting starts operating the drive at the minimum output frequency when the Run command is entered. If external Speed
Search 1 or 2 is already enabled by a digital input, the drive will start operating with Speed Search.
Setting 1: Enabled
This setting performs Speed Search when the Run command is entered. The drive begins running the motor after Speed Search
is complete.
n
b3-03: Speed Search Deceleration Time
Sets the output frequency reduction ramp. The time entered into b3-03 will be the time to decelerate from maximum frequency
(E1-04) to minimum frequency (E1-09).
In Current Detection Type 2 Speed Search, the time set in this parameter is used as the acceleration or deceleration time for
the output frequency while searching.
No.
Name
Setting Range
Default
b3-03
Speed Search Deceleration Time
0.1 to 10.0 s
2.0 s
n
b3-04: V/f Gain during Speed Search (Speed Estimation Type)
During Speed Search, the output voltage calculated from the V/f pattern is multiplied with this value. Changing this value can
help reduce the output current during Speed Search.
No.
Name
Setting Range
Default
b3-04
V/f Gain during Speed Search
10 to 100%
Determined by
C6-01 and o2-04
n
b3-05: Speed Search Delay Time
In cases where an output contactor is used between the drive and the motor, the contactor must be closed before Speed Search
can be performed. This parameter can be used to delay the Speed Search operation, giving the contactor enough time to close
completely.
No.
Name
Setting Range
Default
b3-05
Speed Search Delay Time
0.0 to 100.0 s
0.2 s
5.2 b: Application
200
YASKAWA ELECTRIC SIEP C710636 04D U1000 Industrial MATRIX Drive Technical Manual
Summary of Contents for U1000 iQpump Drive
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