YASKAWA U1000 Series Technical Manual page 198

5.2 b: Application
b3-29: Speed Search Induced Voltage Level
■
There is normally no need to change this parameter from the default value.
Lower this value in small increments if changes are necessary. However, setting this value too low will prevent the drive
from performing Speed Search.
No.
b3-29
b3-31 Speed Search Operation Current Level 1 (Current Detection 2)
■
Sets the current level used to limit the output current during 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.
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.
b3-31
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.
b3-32
b3-33: Speed Search Selection when Run Command is Input in Uv
■
Activates or deactivates the speed search at start in accordance with whether or not a Run command was issued during an
undervoltage (Uv) if operation during 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.
b3-33
Setting 0: Speed Search disabled
Setting 1: Speed Search enabled
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.
No.
b3-50
b3-51
198
Name
Speed Search Induced Voltage Level
Name
Speed Search Operation Current Level 1 (Current Detection 2)
Name
Speed Search Operation Current Level 2 (Current Detection 2)
Name
Speed Search Selection when Run Command is Input in Uv
Name
Backspin Search Direction Judgment Time 1
Backspin Search Direction Judgment Time 2
Setting Range
Setting Range
Setting Range
Setting Range
Setting Range
YASKAWA ELECTRIC SIEP C710636 02B YASKAWA U1000 Technical Manual
Default
0 to 10%
Default
1.50 to 3.50
Default
0.00 to 1.49
Default
0 or 1
Default
0.0 to 10.0
0.0 to 10.0
10%
1.50
1.20
0
0.0 s
0.0