YASKAWA Z1000U Series Programming Manual page 28

1.2 b: Application
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.
Speed Search Operation Current Level 1 (Current Detection Type
b3-31
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.
b3-32 Speed Search Operation Current Level 2 (Current Detection 2)
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.
No.
b3-33 Speed Search Selection when Run Command is Given during Uv
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.
b3-50
b3-51
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.
28
Name
2)
Name
Name
Name
Backspin Search Direction Judgment Time 1
Backspin Search Direction Judgment Time 2
YASKAWA ELECTRIC SIEP C710636 10C Z1000U HVAC MATRIX Drive Programming Manual
Setting Range
1.50 to 3.50
Setting Range
0.00 to 1.49
Setting Range
0, 1
Setting Range
Determined by
0.0 to 10.0
0.0 to 10.0
Default
1.50
Default
1.20
Default
0
Default
A1-02
0.0