11.9 L: Protection Functions
950 YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual
Table 11.71 Parameters for KEB Ride-Thru
No. Name Setting Method
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 [Overvoltage] occurs immediately after you start KEB
deceleration, increase the setting value.
• If Uv1 [DC Bus Undervoltage] occurs immediately after you
start KEB deceleration, decrease the setting value.
x - x x
L2-05 Undervoltage Detection
Lvl (Uv1)
If Uv1 [DC Bus Undervoltage] 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 as follows:
– 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 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 [Overvoltage] occurs immediately after you start
operation, decrease the setting value.
• If Uv1 [DC Bus Undervoltage] 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 occur 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 - -
L3-21 OVSuppression Accel/
Decel P Gain
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.
- x - -
L3-24 Motor Accel Time @
Rated Torque
Set the motor acceleration time to the maximum frequency at
the motor rated torque.
- x - -
L3-25 Load Inertia Ratio Sets the ratio between motor inertia and machine inertia. - x
*3
- -
*1 When L2-29 = 0 [Kinetic Energy Backup Method = Single Drive KEB Ride-Thru 1], the drive will automatically set C1-09 [Fast
Stop Time] in KEB Tuning. 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 [Kinetic 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 [Kinetic Energy Backup Decel Time].
*3 The drive sets this value automatically when KEB Tuning completes correctly.
To Next Page
Loading...
