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îš„Adjusting Slip Compensation Primary Delay Time Constant (C3-02)
The slip compensation delay time constant is set in ms.
The setting value of C3-02 depends on the control method. The factory settings are:
• V/f control without PG: 2000 ms
• Open loop vector control: 200 ms
Normally, there is no need to change these settings. When the slip compensation response is low, lower the set
value. When the speed is unstable, increase the set value.
îš„Adjusting Slip Compensation Limit (C3-03)
Using parameter C3-03 the upper limit for the slip compensation can be set as a percentage, taking the motor
rated slip as 100%.
If the speed is lower than the target value but does not change even after adjusting the slip compensation gain,
the slip compensation limit may have reached. Increase the limit, and check the speed again. Always make
sure that the value of the slip compensation limit and reference frequency does not exceed the tolerance of the
machine.
The following diagram shows the slip compensation limit for the constant torque range and fixed output range.
Fig 6.39 Slip Compensation Limit
îš„Selecting Slip Compensation Function During Regeneration (C3-04)
Enables or disables the slip compensation function during regeneration.
If the slip compensation function operates during regeneration, you might have to use a braking option (brak-
ing resistor, braking resistor unit and braking unit).
îš„Operation Selection when Output Voltage Saturated (C3-05)
Generally the Inverter cannot output a voltage that is higher than the input voltage. If the output voltage refer-
ence for the motor (monitor parameter U1-06) exceeds the input voltage in the high-speed range, the output
voltage becomes saturated, and inverter cannot respond to speed or load changes. This function automatically
reduces the output voltage to avoid voltage saturation.
Thereby the speed control accuracy can be maintained even at high speeds (around the rated speed of the
motor). By the lowered voltage the current can be around 10% higher compared to the operation without volt-
age limiter.
Slip compensation limit
Output frequency
E1-06: Base frequency
E1-04: Maximum output frequency
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