NOTICE: Rapid deceleration can trigger an overvoltage fault. The drive output shuts off when faulted and the motor coasts. Set an
appropriate Fast Stop time to C1-09 to avoid this uncontrolled motor state and to ensure that the motor stops quickly and safely.
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C1-10: Accel/Decel Time Setting Units
Determines the units for the acceleration and deceleration times set to C1-01 through C1-09 using parameter C1-10.
No.
Parameter Name
Setting Range
Default
C1-10
Accel/Decel Time Setting Units
0, 1
1
Setting 0: 0.01 s units
The accel/decel times are set in 0.01 s units. The setting range is 0.00 to 600.00 s. C1-10 cannot be set to 0 if any of the
parameters C1-01 to C1-09 is set to 600.1 s or longer.
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.
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.
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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.
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 1.30 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.
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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.
1.3 C: Tuning
48
YASKAWA ELECTRIC SIEP YEAHHP 01B YASKAWA AC Drive – A1000 HHP Programming Manual
Summary of Contents for A1000 HHP
Page 359: ......
