Slip Compensation Function - Omron VS mini J7 User Manual

Slip Compensation Function

6-6

Slip Compensation Function

n64
Setting 0.0 to 20.0 (Hz)
range
Set Values
n65
Setting 0 to 99 (%)
range
Set Values
n66
Setting 0.0 to 2.5
range
Set Values
n67
Setting 0.0 to 25.5 (s)
range
Set Values
78
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.
Motor Rated Slip
Unit of
setting
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.
Rated slit value (Hz) = Rated frequency (Hz) –
Motor No-load Current
Unit of
setting
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
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
Unit of
setting
• 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:
The motor response is low:
Changes during
operation
0.1 Hz Default setting
Rated prm
Changes during
operation
1% Default setting
Changes during
operation
0.1 Default setting
Changes during
operation
0.1 s Default setting
Set the value to a larger value.
Set the value to a smaller value.
Chapter 6-6
Yes
(see note)
Number of poles
120
No
(see note)
Yes
0.0
(see note)
No
2.0