5.11 S: Functions for Textile Applications
YASKAWA ELECTRIC SIEP C710606 44B YASKAWA AC Drive T1000V Technical Manual 229
■ S6-04: DC Bus Adjustment Gain
Sets the gain to keep the voltage in the DC bus at the target level. If overvoltage or undervoltage is a problem at the start
of Power KEB, gradually increasing S6-04 in increments of 0.1 may help.
DC Bus Gain Adjustment for Power KEB and Intelligent Stall Prevention
• If overvoltage or undervoltage is a problem at the start of Power KEB or when the “intelligent” method of Stall
Prevention during deceleration (L3-04 = 2) is performed, then gradually increasing S6-04 in increments of 0.1.
• Setting S6-04 too high can result in a large speed or current ripple.
DC Bus Gain Adjustment for Overvoltage Suppression
• For sudden increases in a regenerative load resulting in overvoltage, trying gradually increasing S6-04 in increments of
0.1.
• Setting S6-04 too high can result in a large speed or current ripple.
■
S6-05: Accel/Decel Calculation Gain
Sets the gain used to calculate the acceleration and deceleration rates used for Power KEB, overvoltage suppression, and
“intelligent” method of Stall Prevention during deceleration (L3-04 = 2).
Adjusting Calculation Gain for Power KEB and Intelligent Stall Prevention
• If speed or current ripple is a problem at the start of Power KEB or when the “intelligent” method of Stall Prevention
during deceleration (L3-04 = 2) is performed, then gradually reduce S6-05 in steps of 0.05
• For problems with overvoltage or overcurrent, reduce the value set to S6-05.
• If the calculation gain set to S6-05 is too low, the drive may be sluggish in suppressing DC bus voltage, and
deceleration times may take longer than is optimal.
Adjusting Calculation Gain for Overvoltage Suppression
• If the overvoltage suppression function is enabled (L3-11 = 1) but cannot handle the amount of regenerative energy
coming back from the motor, try gradually increasing S6-05 in increments of 0.1.
• If speed ripple is a problem while the overvoltage suppression function is enabled (L3-11 = 1), try gradually decreasing
S6-05 in steps of 0.05.
◆ T: Motor Tuning
Auto-Tuning automatically sets and tunes parameters required for optimal motor performance.
Refer to Auto-Tuning on page 88 for details on Auto-Tuning parameters.
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.
Name Setting Range Default
S6-04
DC Bus Adjustment Gain
0.00 to 5.00 1.00 <1>
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.
Name Setting Range Default
S6-05
Accel/Decel Calculation Gain
0.00 to 200.00 1.00 <1>
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