YASKAWA GA800 Programming Manual page 446

Ac drive for industrial applications
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2.9 L: Protection Functions
Parameters for KEB Ride-Thru
Table 2.67
shows the parameters that adjust the KEB Ride-Thru function. Parameter settings are different for the
different KEB methods set in L2-29 [Kinetic Energy Backup Method].
No.
Name
C1-09
Fast Stop Time
S-Curve Time @ Start of Decel • If ov occurs immediately after you start KEB deceleration, increase the setting
C2-03
L2-05
Undervoltage Detection Lvl
(Uv1)
L2-06
Does KEB Tuning.
L2-07
Kinetic Energy Backup Accel
Time
L2-08
Frequency Gain at KEB Start
L2-10
Minimum KEB Time
L2-11
KEB DC Bus Voltage Setpoint • Single Drive KEB Ride-Thru 2
L3-20
DC Bus Voltage Adjustment
Gain
446
Figure 2.128 KEB Function Wiring Example
Table 2.67 Parameters for KEB Ride-Thru
Configuring Settings
• If ov [Overvoltage] occurs during KEB deceleration, increase the setting value.
• If Uv1 [DC Bus Undervoltage] occurs during KEB deceleration, decrease the
setting value.
value.
• If Uv1 occurs immediately after you start KEB deceleration, decrease the setting
value.
If Uv1 occurs immediately after you start KEB deceleration, increase the setting
value to detect power loss more quickly.
• Kinetic Energy Backup Decel Time
• If ov or Uv1 occur during KEB deceleration after KEB Tuning, set L2-06 in these
conditions:
– If ov occurs, increase the setting value
– If Uv1 occurs, decrease the setting value.
Sets the acceleration time to return to the frequency reference value before a power
loss, after you cancel the KEB operation. When L2-07 = 0, the drive uses the
standard acceleration times set in C1-01, C1-03, C1-05, and C1-07 [Acceleration
Time].
• If ov occurs immediately after you start operation, decrease the setting value.
• If Uv1 occurs immediately after you start operation, increase the setting value.
• With KEB Ride-Thru
There is Uv1 because you set a digital input for KEB Ride-Thru and the device
that controls the input operated too slowly after power loss.
• Without KEB Ride-Thru
If the DC bus voltage overshoots immediately after KEB Ride-Thru starts,
increase L2-10 to longer than the overshoot.
Set to approximately 1.22 x input voltage.
• Single Drive KEB Ride-Thru 1, System KEB Ride-Thru 1, or System KEB Ride-
Thru 2
Set to approximately 1.4 x input voltage.
• If ov or Uv1 occurs at the start of deceleration when you use KEB operation,
increase this value in 0.1-unit increments.
• If there is torque ripple during deceleration when you use KEB Ride-Thru,
decrease the value.
L2-29 [Kinetic Energy Backup Method]
0
1
*1
x
x
x
-
x
x
x
x
-
YASKAWA TOEPYAIGA8002B GA800 Drive Programming
2
3
-
-
-
-
x
x
x
x
x
*2
*2
-
x
x
x
x
x
-
x
x
x
x
x
x
x
x
x
-
-

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