Yaskawa CIMR-UU4A0034A [304/644] N3 overexcitation braking

Yaskawa CIMR-UU2A0081A [304/644] N3 overexcitation braking
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n2: Speed Feedback Detection Control (AFR) Tuning
These parameters help achieve speed stability when a load is suddenly applied or removed.
Note: Properly set all motor parameters or perform Auto-Tuning before making changes to the AFR parameters.
n
n2-01: AFR Gain
Sets the internal speed feedback detection control gain in the AFR.
No. Name Setting Range Default
n2-01 AFR Gain 0.00 to 10.00 1.00
Although this parameter rarely needs to be changed, it may require adjustment in the following situations:
If hunting occurs, increase the setting value in steps of 0.05 while checking the response.
If response is low, decrease the setting value in steps of 0.05 while checking the response.
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n2-02: AFR Time Constant 1
Sets the time constant normally used by AFR.
No. Name Setting Range Default
n2-02 AFR Time Constant 1 0 to 2000 ms 50 ms
Although this parameter rarely needs to be changed, adjustment may be required in the following situations:
If hunting occurs, increase the value. If response is low, decrease it.
When
setting the parameter to a higher value, increase C4-02, Torque Compensation Delay Time Constant 1, proportionally.
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n3: Overexcitation Braking
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Overexcitation Deceleration (Induction Motors)
Increases the flux during deceleration and allows shorter deceleration time settings. Enabled by setting L3-04 to 4. Refer to
L3-04: Stall Prevention Selection during Deceleration
on page 287.
Notes on Overexcitation Deceleration
During Overexcitation Deceleration 2, Hunting Prevention in V/f Control and torque limits in OLV Control are disabled.
Overexcitation Deceleration can be used in OLV and CLV, but it lowers the accuracy of Torque Control and braking
efficiency. It can be most efficiently used in a V/f Control.
Overexcitation Deceleration cannot be used with PM motors.
Parameter Adjustments
When repetitive or long Overexcitation Deceleration causes motor overheat, lower the overexcitation gain (n3-13) and reduce
the overslip suppression current level (n3-21).
During Overexcitation Deceleration (L3-04 = 4), the drive decelerates at the active deceleration time (C1-02, C1-04, C1-06,
or C1-08). Set this time so no overcurrent (oC) fault occurs.
During Overexcitation Deceleration 2 (L3-04 = 5), the drive decelerates using the active deceleration time while adjusting
the deceleration rate to keep the DC bus voltage at the level set to L3-17. The actual stopping time will be longer or shorter
than the set deceleration time depending on the motor characteristics and the load inertia. Increase the deceleration time if
overcurrent (oC) occurs.
Entering a Run command during Overexcitation Deceleration cancels overexcitation operation and the drive reaccelerates
to the specified speed.
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n3-13: Overexcitation Deceleration Gain
Multiplies a gain to the V/f pattern output value during Overexcitation Deceleration to determine the level of overexcitation.
The drive returns to the normal V/f value after the motor has stopped or when it is accelerating to the frequency reference.
No. Name Setting Range Default
n3-13 Overexcitation Deceleration Gain 1.00 to 2.00 1.10
The optimum setting for n3-13 depends on the motor flux saturation characteristics.
Gradually increase the gain to 1.25 or 1.90 to improve the braking power of Overexcitation Deceleration.
5.9 n: Special Adjustments
304
YASKAWA ELECTRIC SIEP C710636 04C U1000 Industrial MATRIX Drive Technical Manual

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