C2: S-Curve Characteristics - YASKAWA V1000 Technical Manual

C1-14 = 80 Hz
Frequency
reference = 60 Hz
Figure 5.26 Accel/Decel Rate, Example 3 (C1-14 = 80 Hz, E1-04 = 60 Hz, Frequency Reference = 60 Hz)
Note: 1. The accel/decel times shown in
decel at stop of 0.00 s (parameters C2-01 to C2-04).
2. When Stall Prevention during acceleration is enabled (L3-01 ≠ 0), the accel time may take longer than the set value.
3. When Stall Prevention during deceleration is enabled (L3-04 ≠ 0), the decel time may take longer than the set value.
4. When performing Rotational Auto-Tuning for OLV Control (T1-01 = 0) and Rotational Auto-Tuning for V/f Control (T1-04 = 3),
the drive uses the maximum output frequency set in E1-04 to determine the base accel/decel rate, regardless of the C1-14 value.
u

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 (Step Out
Detection) occurs when starting a PM motor, try increasing the value set to C2-01.
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 5.27 explains how S-curves are applied.
FWD run
REV run
Output
frequency
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
YASKAWA ELECTRIC SIEP C710606 16C YASKAWA AC Drive – V1000 Technical Manual
Output
frequency
0
Accel Times 1 to 4
Figure 5.24 to Figure 5.26
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
C2-02
C2-03
C2-01
Figure 5.27 S-Curve Timing Diagram - FWD/REV Operation
Decel Times 1 to 4
assume S-curve characteristic time during accel/decel at start and accel/
Setting Range
0.00 to 10.00 s
C2-04
C2-01
C2-03
C2-02
5.3 C: Tuning
Time
Default
Determined by
A1-02
0.20 s
0.20 s
0.00 s
C2-04
5
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