YASKAWA T1000A Technical Manual page 259

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S5-05: 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. Used in all KEB modes.
When the supply power is lost a second time while reaccelerating with S5-05, KEB deceleration will start again and the
output frequency where this second power loss occurred will be stored by the drive. When restoring the supply again, the
drive will reaccelerate with the S5-05 time to the stored output frequency and continue reacceleration to the frequency
reference with the standard ramp time.
No.
S5-05
Note: If S5-05 is set to 0.0, the drive will use the normal acceleration times (C1-01, C1-03, C1-05, C1-07) to accelerate back up to
speed once power is restored.
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S5-06: S-Curve at KEB Deceleration Start
Sets the S-curve time when KEB begins deceleration. Increase this setting if overvoltage trouble occurs.
Decreases if undervoltage occurs right after power loss deceleration.
No.
S5-06
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S5-07: 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
Increases if Uv is detected right after power loss deceleration.
No.
S5-07
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S5-08: 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
No.
S5-08
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S5-09: Frequency Gain at KEB Start during Deceleration
Sets the output frequency reduction step applied when power loss is detected during deceleration.
Percent of frequency reduction = (slip frequency just before KEB) × S5-09 × 2
No.
S5-09
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S5-10: Synchronous Deceleration ov Prevention
Enables or disables overvoltage prevention during synchronous KEB operation (S4-01 = 2). If S5-10 is enabled the drive
will temporary halt the deceleration if the DC bus voltage rises too high in order to avoid overvoltage trips.
No.
S5-10
Setting 0: Disabled (requires a braking option)
Setting 1: Enabled
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S5-11: KEB Frequency Reduction Step Lower Limit
Sets the lower limit for the frequency reduction step at the start of KEB operation. The lower limit is calculated as
Minimum Frequency Reduction = Motor rated slip (E2-02) × S5-11
YASKAWA ELECTRIC SIEP C710616 30B YASKAWA AC Drive T1000A Technical Manual
Name
KEB Synchronous Acceleration Time
Name
S-Curve at KEB Deceleration Start
Name
Frequency Gain at KEB Start during Constant Speed
Name
Frequency Gain at KEB Start during Acceleration
Name
Frequency Gain at KEB Start during Deceleration
Name
Synchronous Deceleration ov Prevention
5.11 S: Functions for Textile Applications
Setting Range
0.0 to 200.0 s
Setting Range
0.00 to 2.50 s
Setting Range
0 to 300%
Setting Range
0 to 300%
Setting Range
0 to 300%
Setting Range
0, 1
Default
0.0 s
Default
0.20 s
Default
100%
Default
100%
Default
5
100%
Default
0
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