Table 1. Parameters for Fine Tuning the Drive (A1-02 = 5 [OLV/PM])

Issue

Parameter Number

Possible Solutions

Default

Recommended Setting

Unsatisfactory motor performance

E1-xx parameters, E5-xx parameters

  • Check the settings for E1-06, E1-04 [Base Frequency, Maximum Output Frequency].

  • Check the E5-xx and make sure that you set all motor data correctly.

    Note:

    Do not set E5-05 [PM Motor Resistance (ohms/phase)] to a line-to-line resistance value.

  • Do Auto-Tuning.

-

-

Unsatisfactory motor torque and speed response

n8-55 [Motor to Load Inertia Ratio]

Adjust to align the load inertia ratio of the motor and machine.

0

Near the load inertia ratio.

n8-45 [Speed Feedback Detection Gain]

Decrease the setting value in increments of 0.05.

0.80

-

C4-01 [Torque Compensation Gain]

Adjust the setting value.

Note:

If you set this value too high, it can cause overcompensation and motor oscillation.

0.00

1.00

  • Oscillation when the motor starts.

  • Motor stalls.

n8-51 [Pull-in Current @ Accel/Decel]

Increase the setting value in increments of 5%.

50%

-

  • b2-02 [DC Injection Braking Current]

  • b2-03 [DC Inject Braking Time at Start]

Use DC Injection Braking at start.

Note:

This can cause the motor to rotate in reverse for approximately 1/8 of a turn at start.

  • b2-02: 50%

  • b2-03: 0.00 s

  • b2-02: Adjust as necessary.

  • b2-03: 0.5 s

n8-55 [Motor to Load Inertia Ratio]

Increase the setting value.

Note:

When you operate a single motor or with a minimum quantity of inertia, if you set this value too high, it can cause motor oscillation.

0

Near the load inertia ratio.

There is too much current during deceleration.

n8-79 [Pull-in Current at Deceleration]

Set n8-79 < n8-51.

50%

Note:

When n8-79 = 0, the drive will apply the n8-51 setting to the pull-in current during deceleration.

Decrease in increments of 5%.

Stalling or oscillation occurs when you apply the load during constant speed

n8-47 [Pull-in Current Comp Filter Time]

Decrease the setting value in increments of 0.2 s.

5.0 s

-

n8-48 [Pull-in/Light Load Id Current]

Increase the setting value in increments of 5%.

30%

-

n8-55 [Motor to Load Inertia Ratio]

Increase the setting value.

Note:

When you operate a single motor or with a minimum quantity of inertia, if you set this value too high, it can cause motor oscillation.

0

Near the load inertia ratio.

Hunting or oscillation

n8-45 [Speed Feedback Detection Gain]

Increase the setting value in increments of 0.05.

0.80

-

The drive detects STPo [Motor Step-Out Detected] fault when the load is not too high.

  • E5-09 [PM Back-EMF Vpeak (mV/(rad/s))]

  • E5-24 [PM Back-EMF L-L Vrms (mV/rpm)]

  • Adjust the setting value.

  • Examine the motor code on the motor nameplate or the data sheet, then set correct values for E5-09 or E5-24.

1

  • Yaskawa motor

    Set the motor code from the motor nameplate.

  • Motor from another manufacturer

    Set the values from the test report.

The drive detected stalling or STPo [Motor Step-Out Detected] at high speed and maximum output voltage.

n8-62 [Output Voltage Limit Level]

Set to a value lower than the actual input voltage.

  • 200.0 V

  • 400.0 V

-
 
1

The default setting changes when the settings for E5-01 [Motor Code Selection] and o2-04 [Drive Model (KVA) Selection] change.