YASKAWA GA800

2.9 L: Protection Functions
446 YASKAWA TOEPYAIGA8002B GA800 Drive Programming
Figure 2.128 KEB Function Wiring Example
■ 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].
Table 2.67 Parameters for KEB Ride-Thru
No. Name Configuring Settings
L2-29 [Kinetic Energy Backup Method]
0 1 2 3
C1-09 Fast Stop Time • If ov [Overvoltage] occurs during KEB deceleration, increase the setting value.
• If Uv1 [DC Bus Undervoltage] occurs during KEB deceleration, decrease the
setting value.
x
*1
- - -
C2-03 S-Curve Time @ Start of Decel • If ov occurs immediately after you start KEB deceleration, increase the setting
value.
• If Uv1 occurs immediately after you start KEB deceleration, decrease the setting
value.
x - x x
L2-05 Undervoltage Detection Lvl
(Uv1)
If Uv1 occurs immediately after you start KEB deceleration, increase the setting
value to detect power loss more quickly.
x x x x
L2-06 Does KEB Tuning. • 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.
- - x
*2
x
*2
L2-07 Kinetic Energy Backup Accel
Time
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].
x x x x
L2-08 Frequency Gain at KEB Start • If ov occurs immediately after you start operation, decrease the setting value.
• If Uv1 occurs immediately after you start operation, increase the setting value.
x - x x
L2-10 Minimum KEB Time • 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.
x x x x
L2-11 KEB DC Bus Voltage Setpoint • Single Drive KEB Ride-Thru 2
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.
x x x x
L3-20 DC Bus Voltage Adjustment
Gain
• 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.
- x - -