Omron Q2A Series Technical Manual page 748

12.8 L: PROTECTION
No. Name
L2-11 KEB DC Volt Setpoint
L3-20 DCBus VoltAdj Gain
L3-21 OVSup Acc/Dec Gain
L3-24 Acc@Rated Torque
L3-25 Load Inertia Ratio
*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.
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L2-01 RideThru@PwrLoss
No.
Name
(Hex.)
L2-01 RideThru@PwrLoss
(0485)
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.
Name
(Hex.)
L2-02 RideThrough Time@Power
Loss
(0486)
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.
748
Setting Method
• 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.
• 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.
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
Sets the drive operation after a momentary power loss.
V/f CL-V/f OLV CLV
Sets the maximum time that the drive will wait until trying to restart after power loss.
Description
AOLV OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
AOLV OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
SIEPYEUOQ2A01A AC Drive Q2A Technical Manual
L2-29 [KEB Method]
1 2 3 4
x x x x
- x - -
- x - -
- x - -
*3
- x - -
Default
(Range)
0
(0, 1)
Default
(Range)
Determined by o2-04 and
C6-01
(0.0 - 25.5 s)