C2: S-Curve Characteristics; C3: Slip Compensation - YASKAWA J1000 Technical Manual

5.3 C: Tuning
NOTICE: Rapid deceleration can trigger an overvoltage fault. When faulted, the drive output shuts off, and the motor coasts. To avoid this
uncontrolled motor state and to ensure that the motor stops quickly and safely, set an appropriate Fast-stop time to C1-09.
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C2: S-Curve Characteristics

Use S-curve characteristics to smooth acceleration and deceleration and to minimize abrupt shock to the load.
n C2-01 to C2-04: S-Curve Characteristics
C2-01 through C2-04 set separate S-curves for each section of the acceleration or deceleration.
No.
C2-01
C2-02
C2-03
C2-04
Figure 5.6 explains how S-curves are applied.
Setting the S-curve will increase the acceleration and deceleration times.
Actual accel time = accel time setting + (C2-01 + C2-02)/2
Actual decel time = decel time setting + (C2-03 + C2-04)/2
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C3: Slip Compensation

The Slip Compensation function prevents motor speed loss due to an increase in load.
Note: Before making changes to the Slip Compensation parameters, make sure the motor parameters and V/f pattern are set properly.
n C3-01: Slip Compensation Gain
This parameter sets the gain for the motor slip compensation function. Although this parameter rarely needs to be changed,
adjustments might be needed under the following situations:
• If the speed at constant frequency reference is lower than the frequency reference, increase C3-01.
• If the speed at constant frequency reference is higher than the frequency reference, decrease C3-01.
No.
C3-01
n C3-02: Slip Compensation Primary Delay Time
Adjusts the filter on the output of the slip compensation function. Although this parameter rarely needs to be changed,
adjustments might be needed under the following situations:
• Decrease the setting when the slip compensation response is too slow.
• Increase this setting when the speed is not stable.
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Parameter Name
S-Curve Characteristic at Accel Start
S-Curve Characteristic at Accel End
S-Curve Characteristic at Decel Start
S-Curve Characteristic at Decel End
FWD run
REV run
C2-02
Output
frequency
C2-01
Figure 5.6 S-Curve Timing Diagram - FWD/REV Operation
Parameter Name
Slip Compensation Gain
http://nicontrols.com
C2-04
C2-03
C2-01
C2-02
YASKAWA ELECTRIC SIEP C710606 31B YASKAWA AC Drive – J1000 Technical Manual
Setting Range
0.00 to 10.00 s
C2-04
C2-03
Setting Range
0.0 to 2.5
Default
0.20 s
0.20 s
0.20 s
0.00 s
Default
0.0