5.11 S: Functions for Textile Applications
YASKAWA ELECTRIC SIEP C710616 30B YASKAWA AC Drive T1000A Technical Manual 261
Parameter Details
5
n 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.
n
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.
n
S6-06: ASR Primary Delay Time Constant 2
Sets the filter time constant in seconds for the time from the speed loop to the torque reference output when the Power
KEB Ride-Thru is enabled (S4-01 = 3). If oscillation occurs during Power KEB Ride-Thru, then gradually increase this
setting in increments of 0.01 s.
n
S6-07: Torque Limit Delay Time
Sets the filter time constant in seconds for the torque limit value to return to set value when the Power KEB Ride-Thru is
enabled (S4-01 = 3). If oscillation occurs during Power KEB Ride-Thru, then gradually increase this setting in
increments of 0.010 s.
No. Name Setting Range Default
S6-04 DC Bus Adjustment Gain 0.00 to 5.00 Determined by A1-02
No. Name Setting Range Default
S6-05 Accel/Decel Calculation Gain 0.00 to 200.00 1.00
No. Name Setting Range Default
S6-06 ASR Primary Delay Time Constant 2 0.000 to 0.500 s 0.000 s
No. Name Setting Range Default
S6-07 Torque Limit Delay Time 0.000 to 1.000 s Determined by A1-02
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