YASKAWA U1000 Series Technical Manual page 219

Note: Default setting is 0.0 in V/f Control (A1-02 = 0), and 1.0 in Open Loop Vector Control (A1-02 = 2). In Closed Loop Vector
Control, slip compensation is used to correct inaccuracies that can result from temperature fluctuation in the rotor.
C3-02: Slip Compensation Primary Delay Time
■
Adjusts the filter on the output side of the slip compensation function. Although this parameter rarely needs to be
changed, adjustment may help in the following situations:
• Decrease the setting when the slip compensation response is too slow.
• Increase this setting when speed is unstable.
No.
C3-02
Note: Default for V/f Control (A1-02 = 0) is 2000 ms. Default for Open Loop Vector Control (A1-02 = 2) is 200 ms.
C3-03: Slip Compensation Limit
■
Sets the upper limit for the slip compensation function as a percentage of the motor rated slip (E2-02).
No.
C3-03
The slip compensation limit is constant throughout the constant torque range (frequency reference ≤ E1-06). In the
constant power range (frequency reference ≥ E1-06), it is increased based on C3-03 and the output frequency as shown in
Figure 5.34.
Figure 5.34
■ C3-04: Slip Compensation Selection during Regeneration
Enables or disables slip compensation during regenerative operation.
Even if enabled, this function does not operate when the output frequency is too low.
No.
C3-04
Setting 0: Disabled
Slip compensation is not provided. Depending on the load and mode of operation, the actual motor speed will be lower or
higher than the frequency reference.
Setting 1: Enabled (6 Hz and above)
Slip compensation is enabled during regenerative operation. It will not be active at output frequencies below 6 Hz.
Setting 2: Enabled (compensation provided wherever possible)
Slip compensation is enabled during regenerative operation, and at frequencies as low as 2 Hz. The drive uses the motor
rated slip set in E2-02 to automatically calculate the frequency range where compensation will be disabled.
C3-05: Output Voltage Limit Operation Selection
■
Determines if the motor flux reference is automatically reduced when output voltage reaches the saturation range.
If the input power supply voltage is low or the motor has a high voltage rating, this function can help improve the speed
precision when moving heavy loads at high speeds. When this function is enabled, the reduction in flux causes a slightly
higher current at high speed. Keep this in mind when selecting the drive.
YASKAWA ELECTRIC SIEP C710636 02B YASKAWA U1000 Technical Manual
Parameter Name
Slip Compensation Primary Delay Time
Parameter Name
Slip Compensation Limit
E1-04
E1-06 × C3-03
C3-03
Frequency
Figure 5.34 Slip Compensation Limit
Parameter Name
Slip Compensation Selection during Regeneration
Output Frequency
E1-06 E1-04
Base Maximum Output
Frequency
5.3 C: Tuning
Setting Range Default
0 to 10000 ms Determined by A1-02
Setting Range Default
0 to 250%
Setting Range Default
0 to 2
200%
0
5
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