C2: S-Curve Characteristics; C3: Slip Compensation - YASKAWA T1000A Technical Manual

5.3 C: Tuning
NOTICE: Rapid deceleration can trigger an overvoltage fault. When faulted, the drive output shuts off, and the motor coasts. To avoid
this uncontrolled motor state and to ensure that the motor stops quickly and safely, set an appropriate Fast Stop time to C1-09.
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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.
C1-10
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.
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 the STo fault
(Hunting Detection) 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.
No.
C2-01
C2-02
C2-03
C2-04
Figure 5.29 explains how S-curves are applied.
Figure 5.29
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
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
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:
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Parameter Name
Accel/Decel Time Setting Units
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 5.29 S-Curve Timing Diagram - FWD/REV Operation
YASKAWA ELECTRIC SIEP C710616 30B YASKAWA AC Drive T1000A Technical Manual
Setting Range
Setting Range
0.00 to 10.00 s
C2-04
C2-04
C2-01
C2-03
C2-02
Default
0 or 1 1
Default
Determined by A1-02
0.20 s
0.20 s
0.00 s