5.2 b: Application
124 YASKAWA ELECTRIC SIEP C710616 30B YASKAWA AC Drive T1000A Technical Manual
command must be entered 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 as specified by b3-24 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). See Refer to L2-01: Momentary Power Loss Operation Selection on page 217
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.
n
b3-01: Speed Search Selection at Start
Determines if Speed Search is automatically performed when a Run command is issued or not.
Setting 0: Disabled
When the Run command is entered, the drive starts operating at the minimum output frequency. 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
Speed Search is performed whenever the Run command is entered. The drive begins running the motor once Speed
Search is complete.
n
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. If the drive has trouble restarting, try lowering this value.
Note: When parameter A1-02 = 0 (V/f Control) the factory default setting is 120. When parameter A1-02 = 2 (Open Loop Vector) the
factory default setting is 100.
n b3-03: Speed Search Deceleration Time
Parameter b3-03 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).
n
b3-04: V/f Gain During Speed Search
During Speed Search, the output voltage calculated from the V/f pattern is multiplied with the value set in parameter b3-
04. Changing this setting can be useful in order to reduce the output current during Speed Search.
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. Parameter Name Setting Range Default
b3-01 Speed Search Selection at Start 0 or 1 Determined by A1-02
No. Name Setting Range Default
b3-02 Speed Search Deactivation Current 0 to 200% Determined by A1-02
No. Name Setting Range Default
b3-03 Speed Search Deceleration Time 0.1 to 10.0 s 2.0 s
No. Name Setting Range Default
b3-04 V/f Gain During Speed Search 10 to 100%
Determined by o2-04,
C6-01
No. Name Setting Range Default
b3-05 Speed Search Delay Time 0.0 to 100.0 s 0.2 s
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