YASKAWA GA700 Series Technical Manual page 881

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Parameters for KEB Ride-Thru
Table 12.72 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].
No. Name
C1-09 Fast Stop Time
C2-03 S-Curve Time @ Start of
Decel
L2-05 Undervoltage Detection Lvl
(Uv1)
L2-06 Kinetic Energy Backup Decel
Time
L2-07 Kinetic Energy Backup Accel
Time
L2-08 Frequency Gain at KEB Start • If ov occurs immediately after you start operation, decrease the setting value.
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
L3-21 OVSuppression Accel/Decel P
Gain
L3-24 Motor Accel Time @ Rated
Torque
L3-25 Load Inertia Ratio
*1 When L2-29 = 0 [KEB Energy Backup Method = Single Drive KEB Ride-Thru 1] and you do KEB Auto-Tuning, the drive will
automatically set C1-09. If you must not change the Fast Stop time, do not do KEB Tuning.
*2 If you do KEB Tuning when L2-29 = 1, 2, or 3 [KEB Energy Backup Method = Single Drive KEB Ride-Thru 2, System KEB Ride-
Thru 1 or System KEB Ride-Thru 2], the drive will automatically set L2-06 [KEB Decel Time].
*3 The drive sets this value automatically when KEB Tuning completes correctly.
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L2-01: Power Loss Ride Through Select
No.
Name
(Hex.)
L2-01 Power Loss Ride Through
Select
(0485)
The drive detects momentary power loss when the drive DC bus voltage is less than the value set in L2-05
[Undervoltage Detection Lvl (Uv1)].
0 : Disable
A momentary power loss triggers Uv1 [DC Bus Undervoltage].
If you do not restore power in 15 ms, a Uv1 is triggered and the drive shuts off the output. The motor coasts to
stop.
YASKAWA SIEPC71061705H GA700 Series Technical Manual
Table 12.72 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.
• 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.
If Uv1 occurs immediately after you start KEB deceleration, increase the setting
value to detect power loss more quickly.
• 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.
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 Uv1 occurs immediately after you start KEB deceleration, 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.
If there is large speed or current ripple, decrease the value in 0.05 unit increments.
Note:
If the setting value is too low, then the drive will have unsatisfactory DC bus
voltage control response. The drive can detect ov or Uv1.
Set the motor acceleration time to the maximum frequency at the motor rated
torque.
Sets the ratio between motor inertia and machine inertia.
V/f CL-V/f OLV CLV AOLV
Sets the drive operation after a momentary power loss.
12.9 L: Protection Functions
L2-29 [Kinetic Energy Backup Method]
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
0 1 2 3
*1
x - - -
x - x x
x x x x
*2 *2
- - x x
x x x x
x - x x
x x x x
x x x x
- x - -
- x - -
- x - -
*3
- x - -
Default
(Range)
0
(0 - 5)
881
12