2.9 L: Protection Functions
368 YASKAWA TOEPYAIGA5002A GA500 DRIVE PROGRAMMING
KEB Operation when L2-01 = 5 [Kinetic Energy Backup: DecelStop]
The drive starts deceleration through KEB operation. If you do not input the Run command, the motor cannot restart.
The drive will continue to decelerate until the motor comes to the minimum output frequency or a complete stop. If
you return power during deceleration, the drive continues to decelerate.
■ KEB Operation Wiring Example
Figure 2.108 shows an example that uses an undervoltage relay to trigger the KEB Ride-Thru at power loss. When a
power loss occurs, the undervoltage relay triggers KEB Ride-Thru [H1-06 = 65, 66, 7A, 7B] at terminal S6.
Note:
• Set the drive to activate the Run command while the KEB function is operating. If you turn off the Run command, the drive will not
accelerate back to speed when you return power.
• When you set L2-29 = 2 [Kinetic Energy Backup Method = System KEB Ride-Thru 1], install a dynamic braking option.
Figure 2.108 KEB Function Wiring Example
■ Parameters for KEB Ride-Thru
Table 2.59 shows the parameters that adjust the KEB Ride-Thru function. Parameter settings are different for the
different KEB methods set in L2-29 [KEB Energy Backup Method].
Table 2.59 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 operation, 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 Kinetic Energy Backup Decel
Time
• Does KEB Tuning.
• If ov or Uv1 occur during KEB deceleration after the 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
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