5.11 S: Functions for Textile Applications
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YASKAWA ELECTRIC
SIEP C710606 44B YASKAWA AC Drive T1000V Technical Manual
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S4-01: KEB Mode Selection
Determines which of the three types of KEB to use.
To have the drive perform KEB itself (i.e., using its own independent deceleration rate), then use KEB 1 or KEB 3 by
setting S4-01 to either 1 or 3.
For drives running on a line system in a textile application, it may be beneficial to synchronize the deceleration rate for
all drives on the line. Use KEB 2 (S4-01 = 2) to have all drive decelerate together.
0: KEB Disabled
Drive will not use KEB when power loss occurs.
1: DC Bus Voltage Control (KEB 1)
When KEB is triggered, the drive observes the DC bus voltage and holds the frequency if the voltage rises. The
deceleration rate is adjusted in accordance with the KEB decel times set to S5-01 and S5-02. This selection is
recommended when a braking resistor option is not installed.
Note:
A braking resistor option must be installed when using KEB in a line system in which synchronous accel/decel is required.
Frequency hold should also be disabled when decelerating during KEB (S5-10 = 0) in such applications.
2: Synchronous Accel/Decel (KEB 2)
KEB decelerates the motor according to the times set in S5-01 and S5-02, regardless of the DC bus voltage level. A
braking resistor should be used to prevent problems with overvoltage.
3: Power KEB (KEB 3)
Using inertia data of the machine the drive calculates the optimal deceleration rate in order to keep the DC bus voltage at
the target level set in parameter S4-11.
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S4-02: KEB Start/End Voltage Setting Mode
Determines how the KEB start and end voltage in parameters S4-03 and S4-06 are set.
0: Set as a Percentage of E1-01
1: Set as a Percentage of the DC Bus Voltage Before KEB was Triggered
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S4-03: KEB Start Voltage
Determines the voltage level in the DC bus that will trigger KEB. Sets the minimum operation time for KEB once it is
triggered. The setting value depends on the selection in parameter S4-02. A setting of 200.0% essentially disables S4-03.
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S4-04: KEB Start dv/dt Level
Sets the level of voltage fluctuation in the DC bus that triggers KEB. If set to 0, this parameter will not trigger KEB.
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S4-05: KEB Start dv/dt Filter
Sets the time required for the voltage fluctuation level defined in S4-04 to trigger KEB.
No.
Name
Setting Range
Default
S4-01
KEB Mode Selection
0 to 3
0
No.
Name
Setting Range
Default
S4-02
KEB Start/End Voltage
0, 1
0
No.
Name
Setting Range
Default
S4-03
KEB Start Voltage
0.0 to 200.0%
200.0%
No.
Name
Setting Range
Default
S4-04
KEB Start dv/dt Level
0 to 10000 Vdc/s
0 Vdc/s
No.
Name
Setting Range
Default
S4-05
KEB Start dv/dt Filter
0 to 50 ms
20 ms