B.3 Parameter Table
410 YASKAWA ELECTRIC SIEP C710616 30B YASKAWA AC Drive T1000A Technical Manual
n S5: KEB Accel/Decel Settings
S4-07
(6B6H)
KEB End Detection Time
Sets the time for that the DC bus voltage must exceed the level set in S4-06 in order to end the
KEB function and reaccelerate to the set frequency reference.
Default: 0 ms
Min: 0 ms
Max: 2000 ms
257
S4-08
(6B7H)
KEB 1 Phase Loss Detection Level
Defines the DC bus voltage ripple that indicates a one phase loss, thus triggering the KEB
function.
Default: 0 V
Min: 0 V
Max: 800 V
<15>
257
S4-09
(6B8H)
KEB 1 Phase Loss Sampling Time
Sets the sampling time used to detect one input phase loss.
Default: 0 ms
Min: 0 ms
Max: 3000 ms
257
S4-10
(6B9H)
KEB 1 Phase Loss Detection Time
Sets the time that the ripple in the DC bus voltage must exceed the level set in S4-08 to trigger
one phase loss detection.
Default: 10 ms
Min: 0 ms
Max: 10 ms
257
S4-11
(6BAH)
KEB Target Voltage
When KEB 1 or KEB 3 is selected, the drive attempts to keep the DC bus voltage at the target
voltage defined in S4-11 multiplied by E1-01.
Default: 1.35
Min: 0.80
Max: 1.50
257
S4-12
(6BBH)
KEB Hold Time
Once the power is restored during KEB, S4-12 sets the time to hold the frequency reference
before reacceleration.
Default: 0.0 s
Min: 0.0 s
Max: 10.0 s
257
S4-13
(6BCH)
KEB Minimum Operation Time
Sets the minimum operation time for KEB once it is triggered.
Default: 50 ms
Min: 0 ms
Max: 2000 ms
257
S4-14
(6BDH)
KEB Reacceleration Prohibit
Frequency
Sets the frequency level to prohibit re-acceleration after the power returned. If the drive output
frequency fell below S4-14 during KEB operation the drive will decelerate the motor to stop,
even if the power returns. When KEB is triggered by One Phase Loss detection, the drive will
never reaccelerate.
Default: 0.0%
Min: 0.0%
Max: 100.0%
258
S4-15
(6BEH)
KEB Supply Loss Detection
Selection
This parameter can be used to trigger KEB operation when the hardware detection circuit
detects that the AC supply voltage has been lost.
0: Disabled
1: Enabled
Default: 1
Min: 0
Max: 1
258
<15> Values shown here are for 200 V class drives. Double the value when using a 400 V class drive.
No. (Addr.) Name Description Setting Page
S5-01
(6C0H)
KEB Decel Time 1
Sets decel time 1 for the start of KEB. S5-01 is enabled when the output frequency is greater
than S5-03.
Default: 0.0 s
Min: 0.0 s
Max: 200.0 s
258
S5-02
(6C1H)
KEB Decel Time 2
Sets decel time 2 for the start of KEB. S5-02 is enabled when the output frequency is less than
or equal to S5-03.
Default: 0.0 s
Min: 0.0 s
Max: 200.0 s
258
S5-03
(6C2H)
KEB Decel Time Switching
Frequency
Sets the frequency for KEB to switch between KEB decel time 1 and KEB decel time 2.
Default: 0.0%
Min: 0.0%
Max: 100.0%
258
S5-04
(6C3H)
KEB Decel Time Switching Time
Sets the time constant used to switch over from deceleration time 1 to deceleration time 2
during KEB.
Default: 0.0 s
Min: 0.0 s
Max: 10.0 s
258
S5-05
(6C4H)
KEB Synchronous Acceleration
Time
Sets time to accelerate from the frequency after KEB to the set frequency reference. This setting
can be used to let multiple drives accelerate synchronously back to the set speed after power
loss.
Default: 0.0 s
Min: 0.0 s
Max: 200.0 s
259
S5-06
(6C5H)
S-Curve at KEB Deceleration Start
Sets the S-curve time when KEB begins decelerating the drive.
Default: 0.20 s
Min: 0.00 s
Max: 2.50 s
259
S5-07
(6C6H)
Frequency Gain at KEB Start
during Constant Speed Sets the output frequency reduction step applied when power loss is detected during constant
speed operation. Percent of frequency reduction = (slip frequency just before KEB) × S5-07 × 2
Default: 100%
Min: 0%
Max: 300%
259
S5-08
(6C7H)
Frequency Gain at KEB Start
during Acceleration
Sets the output frequency reduction step applied when power loss is detected during
acceleration. Percent of frequency reduction = (slip frequency just before KEB) × S5-08 × 2
Default: 100%
Min: 0%
Max: 300%
259
No. (Addr.) Name Description Setting Page
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