YASKAWA T1000V - C2: S-Curve Characteristics

5.3 C: Tuning
YASKAWA ELECTRIC SIEP C710606 44B YASKAWA AC Drive T1000V Technical Manual 135
Parameter Details
5
Setting 0: 0.01 s Units
The accel/decel. times are set in 0.01 s units. The setting range will be 0.00 to 600.00 s. If any of the parameters C1-01 to
C1-09 is set to 600.1 seconds or more, then C1-10 cannot be set to 0.
Setting 1: 0.1 s Units
The accel/decel. times are set in 0.1 s units. The setting range will be 0.0 to 6000.0 s.
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C1-11: Accel/Decel Switching Frequency
Sets the switching frequency for automation accel/decel. time change over. Refer to Switching Accel/decel Times by a
Frequency Level on page 134.
Note: Setting C1-11 to 0.0 Hz 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 a STo fault
(Hunting Detection 2) occurs when starting a PM motor, try increasing the value set to C2-01.
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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.
Figure 5.24 explains how S-curves are applied.
Figure 5.24
Figure 5.24 S-Curve Timing Diagram - FWD/REV Operation
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
No. Parameter Name Setting Range Default
C1-11 Accel/Decel Switching Frequency 0.0 to 400.0 Hz 0.0 Hz
No.
<1> Default setting depends on the control mode selection in parameter A1-02. The value shown here is for V/f Control. Refer to Control Mode
Dependent Parameter Default Values on page 364.
Parameter Name Setting Range Default
C2-01 S-Curve Characteristic at Accel Start
0.00 to 10.00 s
0.20 s <1>
C2-02 S-Curve Characteristic at Accel End
0.20 s
C2-03 S-Curve Characteristic at Decel Start
C2-04 S-Curve Characteristic at Decel End 0.00 s
C2-02
C2-01
C2-03
C2-04
C2-02
C2-01
C2-03
C2-04
FWD run
REV run
Output
frequency