YASKAWA U1000 Series - N2: Speed Feedback Detection Control (AFR) Tuning

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5.9 n: Special Adjustments

322 YASKAWA ELECTRIC SIEP C710636 02B YASKAWA U1000 Technical Manual

■ n1-10: Suppression Frequency

There is normally no need to change this parameter from the default value.

Note: This parameter is available in the drive software versions S1017 and later.

■ n1-11: Suppression Auxiliary Frequency

There is normally no need to change this parameter from the default value.

Note: This parameter is available in the drive software versions S1017 and later.

■ n1-12: Vibration Suppression Time Constant

There is normally no need to change this parameter from the default value.

Note: This parameter is available in the drive software versions S1017 and later.

◆ n2: Speed Feedback Detection Control (AFR) Tuning

These parameters are used to achieve speed stability when a load is suddenly applied or removed.

Note: Before making changes to the AFR parameters, make sure all motor parameters are set properly or perform Auto-Tuning.

■ n2-01: Speed Feedback Detection Control (AFR) Gain

Sets the internal speed feedback detection control gain in the AFR.

Normally there is no need to adjust n2-01 from the default setting. Make adjustments in the following cases:

• 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.

■

n2-02: Speed Feedback Detection Control (AFR) Time Constant 1

Parameter n2-02 sets the time constant normally used by AFR.

These parameters rarely need to be changed. Adjust settings only under the following conditions:

• If hunting occurs, increase n2-02. If response is low, decrease it.

• If setting n2-02 to a higher value, also increase C4-02 (Torque Compensation Primary Delay Time) proportionally.

◆ n3: Overexcitation Braking

■ Overexcitation Deceleration (Induction Motors)

Overexcitation Deceleration increases the flux during deceleration and allows shorter deceleration time settings. Enabled

by setting L3-04 to 4. See L3-04: Stall Prevention Selection during Deceleration on page 305.

Notes on Overexcitation Deceleration

• During Overexcitation Deceleration 2, Hunting Prevention in V/f Control and torque limits in Open Loop Vector

Control are disabled.