In Open Loop Vector Control, keep C4-01 [Torque Compensation Gain] at its default setting (1.00).

If you cannot get speed precision during regeneration in Open Loop Vector Control, set C3-04 = 1 [Slip Compensation at Regen = Enabled Above 6 Hz].

Table 1. Parameters for Fine Tuning the Drive (A1-02 = 2 [OLV])

Issue

Parameter Number

Possible Solutions

Default

Recommended Setting

  • Unsatisfactory motor torque and speed response

  • Hunting or oscillation in the mid-range speed range (10 Hz to 40 Hz)

n2-01 [Automatic Freq Regulator Gain]

  • To increase the speed of torque or speed response, decrease the setting value in 0.05-unit increments.

  • If hunting or oscillation occur, decrease the setting value in 0.05-unit increments.

1.00

0.50 - 2.00

n2-02 [Automatic Freq Regulator Time 1]

  • To increase the speed of torque or speed response, decrease the setting value in 10 ms increments and examine the response.

  • If hunting or oscillation occur or if the load inertia is too much, increase the setting value in 50 ms increments and examine the response.

Note:

Make sure that this parameter setting is: n2-02 ≤ n2-03 [Automatic Freq Regulator Time 2].

When you adjust n2-02, you must also increase the C4-02 [Torque Compensation Delay Time] value by the same ratio.

50 ms

50 ms to 2000 ms

Hunting or oscillation in the high speed range (120 Hz or more)

C4-25 [High-Speed Voltage Compensation]

Adjust the setting value.

1 [Enabled]

0 [Disabled]

ov [Overvoltage] occurs when the drive stops accelerating, starts to decelerate, or when there are large changes in the load.

n2-03 [Automatic Freq Regulator Time 2]

  • If ov occurs, increase the setting value in 50 ms increments and examine the response.

  • If the response is not sufficient, decrease the setting value in 10 ms increments and examine the response.

Note:

Make sure that this parameter setting is: n2-02 [Automatic Freq Regulator Time 1] ≤ n2-03. When you adjust n2-03, you must also increase the C4-06 [Motor 2 Torque Comp Delay Time] value by the same ratio.

750 ms

750 ms to 2000 ms

C4-06 [Motor 2 Torque Comp Delay Time]

  • If ov occurs, increase the setting value in 10 ms increments and examine the response.

  • If the response is not sufficient, decrease the setting value in 2 ms increments and examine the response.

Note:

Make sure that this parameter setting is: C4-02 [Torque Compensation Delay Time] ≤ C4-06.

When you adjust C4-06, you must also increase the n2-03 [Automatic Freq Regulator Time 2] value by the same ratio.

150 ms

150 ms to 750 ms

  • Unsatisfactory motor torque and speed response

  • Hunting or oscillation

C4-02 [Torque Compensation Delay Time]

  • If torque or speed response are slow, decrease the setting value in 2 ms increments.

  • If hunting or oscillation occur, increase the setting value in 10 ms increments.

Note:

Make sure that this parameter setting is: C4-02 ≤ C4-06 [Motor 2 Torque Comp Delay Time].

When you adjust C4-02, you must also increase the n2-02 [Automatic Freq Regulator Time 1] value by the same ratio.

20 ms 1

20 ms - 100 ms 1

  • Speed response is slow.

  • Speed is not stable.

C3-02 [Slip Compensation Delay Time]

  • If speed response is slow, decrease the setting value in 10 ms increments.

  • If speed is not stable, increase the value in 10 ms increments.

200 ms 1

100 ms to 500 ms

Speed precision is unsatisfactory.

C3-01 [Slip Compensation Gain]

  • If speed is too slow, increase the setting value in 0.1 unit increments.

  • If speed is too fast, decrease the setting value in 0.1 unit increments.

1.0 2

0.5 - 1.5

  • The volume of the motor excitation sound is too high.

  • Hunting or oscillation in the low speed range (10 Hz or lower)

C6-02 [Carrier Frequency Selection]

  • If the volume of the motor excitation sound is too high, increase the carrier frequency.

  • If hunting or oscillation occur the the low speed range, decrease the carrier frequency.

1 (2 kHz) 3

0 to upper limit value

  • Torque in the low speed range (10 Hz or lower) is not sufficient.

  • Speed response is slow.

  • Large initial vibration at start up.

  • E1-08 [Mid Point A Voltage]

  • E1-10 [Minimum Output Voltage]

  • If torque or speed response are slow, increase the setting value.

  • If there is large initial vibration at start up, decrease the setting value

Note:

If you set the value too high, the drive can output a large torque reference although the load is light.

  • E1-08: 11.0 V 2

  • E1-10: 2.0 V 2

Default setting +/- 2 V 4
 
1

The default setting changes when the settings for A1-02 [Control Method Selection] and o2-04 [Drive Model (KVA) Selection] change.

2

The default setting changes when the settings for A1-02 [Control Method Selection] and E1-03 [V/f Pattern Selection] change.

3

The default setting changes when the settings for C6-01 [Normal / Heavy Duty Selection] and o2-04 change.

4

Recommended settings are for 200 V class drives. Multiply the voltage by 2 for 400 V class drives.