Setting 1: 0.1 s units
The accel/decel times are set in 0.1 s units. The setting range is 0.0 to 6000.0 s.
n
C1-11: Accel/Decel Time Switching Frequency
Sets the frequency at which the drive switches between accel/decel time settings.
Refer to Switching Accel/Decel Times by
No.
Parameter Name
Setting Range
Default
C1-11
Accel/Decel Time Switching Frequency
Determined by
A1-02
Note:
Setting C1-11 to 0.0 disables this function.
u
C2: S-Curve Characteristics
Use S-curve characteristics to smooth acceleration and deceleration and minimize abrupt shock to the load. Set S-curve
characteristic time during acceleration/deceleration at start and acceleration/deceleration at stop. Increase the value set to
C2-01 if the STo fault (Step Out Detection) occurs when starting a PM motor.
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.
Parameter Name
Setting Range
Default
C2-01
S-Curve Characteristic at Accel Start
0.00 to 10.00 s
Determined by
A1-02
C2-02
S-Curve Characteristic at Accel End
0.20 s
C2-03
S-Curve Characteristic at Decel Start
0.20 s
C2-04
S-Curve Characteristic at Decel End
0.00 s
illustrates S-curve application.
C2-02
C2-01
C2-03
C2-04
C2-02
C2-01
C2-03
C2-04
FWD run
REV run
Output
frequency
Figure 5.33 S-Curve Timing Diagram - FWD/REV Operation
Setting the S-curve will increase the acceleration and deceleration times.
• Actual accel time = accel time s (C2-01 + C2-02) / 2
• Actual decel time = decel time s (C2-03 + C2-04) / 2
u
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 no-load current (E2-03)
have all been set properly before making any adjustments to slip compensation parameters.
n
C3-01: Slip Compensation Gain
Sets the gain for the motor slip compensation function. Although this parameter rarely needs to be changed, adjustments may
be necessary under the following circumstances:
• Increase the setting if the motor at constant speed is slower than the frequency reference.
• Decrease the setting if the motor at constant speed is faster than the frequency reference.
5.3 C: Tuning
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YASKAWA ELECTRIC SIEP C710636 04D U1000 Industrial MATRIX Drive Technical Manual
Summary of Contents for U1000 iQpump Drive
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