Slip Compensation Function. Omron VS MINI J7

Slip Compensation Function

Chapter 6-6

6-6 Slip Compensation Function

The slip compensation function calculates the motor torque according to the output current, and sets gain to compensate for output frequency. This function is used to improve speed accuracy when operating with a load.

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Setting range

0.0 to 20.0 (Hz)

Motor Rated Slip

Unit of setting

0.1 Hz

Changes during operation

Default setting (see note)

Yes

Set Values

Note The default setting varies with the capacity of the Inverter model.

• Set the rated slip value of the motor in use.

• This parameter is used as a slip compensation constant.

• Calculate the rated motor slip value from the rated frequency (Hz) and rpm on the motor nameplate by using the following formula.

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Rated slit value (Hz) = Rated frequency (Hz) –

Rated prm Number of poles

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Motor No-load Current

Unit of setting

1%

Changes during operation

Default setting (see note)

No

Setting range

0 to 99 (%)

Set Values n66

Setting range

0.0 to 2.5

Note The default setting varies with the capacity of the Inverter model.

• Set the motor current with no load in percentage based on the rated motor current as 100%.

• Contact the motor manufacturer for the motor current with no load.

• This parameter is used as a slip compensation constant.

Slip Compensation Gain

Unit of setting

0.1

Changes during operation

Default setting 0.0

(see note)

Yes

Set Values n67

Setting range

Note This parameter is disabled with the value set to 0.0.

• Set the parameter to 1.0 first and check the operation of the Inverter.

Then fine-tune the gain with 0.1-gain increments or decrements.

If the speed is lower than the target value, increase the set value.

If the speed is higher than the target value, decrease the set value.

Slip Compensation Time Constant

0.0 to 25.5 (s) Unit of setting

0.1 s

Changes during operation

Default setting 2.0

No

Set Values • This parameter is used for the response adjustment of the slip compensation function.

• The default setting does not need any changes in normal operation.

• Change the default setting in the following cases.

The motor vibrates: Set the value to a larger value.

The motor response is low: Set the value to a smaller value.

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