C2: S-Curve Characteristics - YASKAWA U1000 Series Technical Manual

5.3 C: Tuning
C1-11: Accel/Decel Time Switching Frequency
■
Sets the frequency at which the drive switches between accel/decel time settings.
by a Frequency Level on page
No.
C1-11
<1> In AOLV/PM and CLV/PM control modes, the setting units and range are expressed in percent (0.0 to 100.0%) instead of in Hz.
Note: Setting C1-11 to 0.0 Hz (0.0%) disables this function.

◆ C2: S-Curve Characteristics

Use S-curve characteristics to smooth acceleration and deceleration and to minimize abrupt shock to the load. Set
S-curve characteristic time during acceleration/deceleration at start and acceleration/deceleration at stop. If the STo fault
(Pull-Out Detection) occurs when starting a PM motor, try increasing the value set to C2-01.
■ 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 5.33 explains how S-curves are applied.
Figure 5.33
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
◆ C3: Slip Compensation
The Slip Compensation function improves the speed accuracy of an induction motor. By adjusting the output frequency
in accordance with the motor load, it compensates the slip and makes the motor speed equal to the frequency reference.
Note: Perform Auto-Tuning and make sure that the motor rated current (E2-01), the motor rated slip (E2-02), and the motor no-load
current (E2-03) have all been set properly before making any adjustments to slip compensation parameters.
■ 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 circumstances:
• If the motor at constant speed is slower than the frequency reference, increase C3-01.
• If the motor at constant speed is faster than the frequency reference, decrease C3-01.
No.
C3-01
218
217.
Parameter Name
Accel/Decel Time Switching Frequency
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
C2-03
Output
frequency
C2-01
Figure 5.33 S-Curve Timing Diagram - FWD/REV Operation
Parameter Name
Slip Compensation Gain
Refer to Switching Accel/Decel Times
Setting Range
0.0 to 400.0 Hz
Setting Range
C2-04
C2-04
C2-01
C2-03
C2-02
Setting Range
YASKAWA ELECTRIC SIEP C710636 02B YASKAWA U1000 Technical Manual
Determined by A1-02
<1>
Determined by A1-02
0.00 to 10.00 s
0.0 to 2.5 Determined by A1-02
Default
<1>
Default
0.20 s
0.20 s
0.00 s
Default