The current level is determined for a no-load current that is 30% of the rated motor current when the setting value of E2-03
is less than or equal to 30% of the rated motor current.
Note: If the setting value is too large, a stopped inductive motor may accelerate too quickly. In such cases, set this parameter to a value that is
smaller than the rated motor current.
No. Name Setting Range Default
b3-31
Speed Search Operation Current Level 1 (Current Detection Type
2)
1.50 to 3.50 1.50
n
b3-32: Speed Search Operation Current Level 2 (Current Detection 2)
Sets the current level at which to end the Speed Search for Current Detection Type Speed Search 2 as a ratio to E2-03, Motor
No-Load Current.
The current level is determined for a no-load current that is 30% of the rated motor current when the setting value of E2-03
is less than or equal to 30% of the rated motor current.
No. Name Setting Range Default
b3-32 Speed Search Operation Current Level 2 (Current Detection 2) 0.00 to 1.49 1.20
n
b3-33: Speed Search Selection when Run Command Is Given during Uv
Activates and deactivates Speed Search at start in accordance with whether a Run command was issued during an undervoltage
(Uv) condition. Function is active when a momentary power loss (L2-01 = 1 or 2), Speed Search at start (b3-01 = 1), and
coasting to a stop (b1-03 = 1) are enabled.
Note: 1. Use a sequence that will hold the Run command even during momentary power losses when the Momentary Power Loss Operation
Selection is enabled (L2-01 = 1 or 2).
2. Disable this parameter for a machine in which the motor will stop during a momentary power loss.
No. Name Setting Range Default
b3-33 Speed Search Selection when Run Command is Given during Uv 0, 1 0
Setting 0: Disabled
Setting 1: Enabled
n
b3-50/b3-51: Backspin Search Direction Judgment Time 1/2
The direction of the Speed Search is adjusted to allow for backspin.
When momentary power loss time t is shorter than the time set in b3-50, the search operates according to the direction command.
When momentary power loss time t is equal to or longer than the time set in b3-51, the search operates from the opposite
direction of the direction command. When momentary power loss time t is equal to or longer than the time set in b3-50 and
shorter than b3-15, baseblock continues until momentary power loss time t exceeds the time set in b3-51. The search then
operates from the opposite direction of the direction command.
Note: 1. Use these parameters only in applications in which backspin can occur
2. Be sure to set b3-50 > b3-51.
3. Backspin detection is not necessary with a PM motor.
No. Name Setting Range Default
b3-50 Backspin Search Direction Judgment Time 1 0.0 to 10.0
Determined by
A1-02
b3-51 Backspin Search Direction Judgment Time 2 0.0 to 10.0 0.0
Speed Search from the Direction Command (0.0 ≤ Momentary Power Loss Time t < b3-50)
When time t from the momentary power loss to recovery is shorter than the setting value of b3-50, Speed Search is performed
in the direction specified by the direction command. The deceleration time set in b3-52 is used for the search frequency and
the setting value of the frequency reference is used as the starting search frequency.
5.2 b: Application
YASKAWA ELECTRIC SIEP C710636 04D U1000 Industrial MATRIX Drive Technical Manual
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5
Parameter Details
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