12.8 L: PROTECTION
748 SIEPYEUOQ2A01A AC Drive Q2A Technical Manual
No. Name Setting Method
L2-29 [KEB Method]
1 2 3 4
L2-11 KEB DC Volt 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 DCBus VoltAdj 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 OVSup Acc/Dec 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 Acc@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 = 1 [KEB Method = Single KEB1 Ride-Thru], 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 = 2, 3, or 4 [KEB Method = Single KEB2 Ride-Thru, System KEB1 Ride-Thru, or System KEB2
Ride-Thru], the drive will automatically set L2-06 [KEB Decel Time].
*3 The drive sets this value automatically when KEB Tuning completes correctly.
■ L2-01 RideThru@PwrLoss
No.
(Hex.)
Name Description
Default
(Range)
L2-01
(0485)
RideThru@PwrLoss
Sets the drive operation after a momentary power loss.
0
(0, 1)
The drive detects momentary power loss when the drive DC bus voltage is less than the value set in L2-05 [UV
Detection Lvl (Uv1)].
0 : Disabled
1 : Enabled
The mode is defined using L2-50 [RidThruMode@PwrLoss].
Note:
When you set L2-01 and L2-50, make sure that you know these items:
• You can use a Momentary Power Loss Unit on models 2004 to 2056 and 4002 to 4031 for a longer momentary power loss ride through
time. A Momentary Power Loss Unit makes it possible to continue operation of the drive after a maximum of 2 seconds of power loss.
• When you set L2-01 = 1 and L2-50 = 0 to 3, keep the magnetic contactor between the motor and the drive closed and keep the control
signal while the drive does KEB operation.
• When you set L2-01 = 1 and L2-50 = 1 to 4, Uv [Undervoltage] will flash on the keypad while the drive tries to recover from a
momentary power loss. The drive will not output a fault signal at this time.
• When you use a magnetic contactor between the motor and the drive, keep the magnetic contactor closed while the drive does KEB
operation or tries to restart with Speed Search.
• Keep the Run command active during KEB operation. The drive cannot accelerate back to the frequency reference when the power
returns.
• When you set L2-01 = 1 and L2-50 = 2 to 4, if the control power supply voltage is less than the CPU operation level during KEB Ride-
Thru, it will trigger Uv1.
■ L2-02 RideThrough Time@Power Loss
No.
(Hex.)
Name Description
Default
(Range)
L2-02
(0486)
RideThrough Time@Power
Loss
Sets the maximum time that the drive will wait until trying to restart after power loss.
Determined by o2-04 and
C6-01
(0.0 - 25.5 s)
This function is applicable when L2-01 = 1 [RideThru@PwrLoss = Enabled] and L2-50 = 0, 2
[RidThruMode@PwrLoss = Timer Controlled, KEB Mode]. If power loss operation is longer than the time set in
this parameter, the drive will detect Uv1 [DC Bus Undervoltage], turn OFF output, and the motor will coast to
stop.
Note:
• The length of time that the drive can recover after a power loss changes when drive capacity changes.
• The upper limit of the possible momentary power loss Ride-Thru time changes when drive capacity changes.
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