Yaskawa AC Drive Z1000 AC Drive HVAC Fan User Manual
Page 34
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.
This mode requires that the Power Loss Ride-Thru function is enabled during CPU operation (L2-01 = 1 or 2).
Momentary Power Loss Operation Selection on page 102
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 (H1-oo = 8 or 9) is released.
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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.
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b3-02: Speed Search Deactivation Current
Sets the operating current for Speed Search as a percentage of the drive rated current. Normally there is no need to change
this setting. Lower this value if the drive has trouble restarting.
No.
Name
Setting Range
Default
b3-02
Speed Search Deactivation Current
0 to 200%
Determined by
A1-02
Note:
When parameter A1-02 = 0 (V/f Control) the factory default setting is 120.
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b3-03: Speed Search Deceleration Time
Sets the output frequency reduction ramp used by Current Detection Speed Search (b3-24 = 0) and by the Current Injection
Method of Speed Estimation (b3-24 = 1). The time entered into b3-03 will be the time to decelerate from maximum frequency
(E1-04) to minimum frequency (E1-09).
No.
Name
Setting Range
Default
b3-03
Speed Search Deceleration Time
0.1 to 10.0 s
2.0 s
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b3-04: V/f Gain during Speed Search
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
o2-04
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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
1.2 b: Application
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YASKAWA ELECTRIC SIEP YAIZ1U 03A YASKAWA AC Drive – Z1000 Programming Manual