YASKAWA T1000A Technical Manual page 256

5.11 S: Functions for Textile Applications
Setting 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.
Setting 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.
Setting 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.
n
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.
No.
S4-02
Setting 0: Set as a Percentage of E1-01 × 1.414
Setting 1: Set as a Percentage of the DC Bus Voltage Before KEB was Triggered
n
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.
No.
S4-03
n
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.
No.
S4-04
n
S4-05: KEB Start dv/dt Filter
Sets the time required for the voltage fluctuation level defined in S4-04 to trigger KEB.
No.
S4-05
n
S4-06: KEB End Voltage
Sets the DC bus voltage level at that the drive assumes the power supply has returned. If this level is exceeded for longer
than S4-07 the drive starts reaccelerating to the set frequency reference. The setting value depends on the selection in
parameter S4-02.
No.
S4-06
Note: 1. This parameter is disregarded by the drive is an input terminal is set for KEB (H1-
2. S4-06 must be set to higher value than S4-11.
256
Name
KEB Start/End Voltage
Name
KEB Start Voltage
Name
KEB Start dv/dt Level
Name
KEB Start dv/dt Filter
Name
KEB End Voltage
YASKAWA ELECTRIC SIEP C710616 30B YASKAWA AC Drive T1000A Technical Manual
Setting Range
0, 1
Setting Range
0.0 to 200.0%
Setting Range
0 to 10000 Vdc/s
Setting Range
0 to 50 ms
Setting Range
0.0 to 200.0%
= 65 or 66).
Default
0
Default
200.0%
Default
0 Vdc/s
Default
20 ms
Default
200.0%