Yaskawa AC Drive-P1000 Industrial Fan - Manual (Page 250)

No. Name Setting Range Default
L3-11 Overvoltage Suppression Function Selection 0, 1 0
Setting 0: Disabled
The regenerative torque limit and the output frequency are not adjusted. A regenerative load may trip the drive with an
overvoltage fault. Use this setting if dynamic braking options are installed.
Setting 1: Enabled
When the DC bus voltage rises due to regenerative load, an overvoltage fault is prevented by decreasing the regenerative
torque limit and increasing the output frequency.
n L3-17: Target DC Bus Voltage for Overvoltage Suppression and Stall Prevention
Sets the target DC bus voltage level used by the overvoltage suppression function (L3-11 = 1), Intelligent Stall Prevention
during deceleration (L3-04 = 2).
No. Name Setting Range Default
L3-17
Target DC Bus Voltage for Overvoltage Suppression
and Stall Prevention
150 to 400 Vdc <1> 375 Vdc <1> <2>
<1> Values are specific to 200 V class drives. Double the value for 400 V class drives. Multiply the value by 2.875 for 600 V class drives, but set the
value below 1040 Vdc (overvoltage protection level).
<2> This value is initialized when E1-01 is changed.
n L3-20: DC Bus Voltage Adjustment Gain
Determines the proportional gain used by overvoltage suppression (L3-11 = 1), Single Drive KEB 2 (L2-29 = 1), KEB Ride-
Thru 2 (H1-oo = 7A or 7B) ,and Intelligent Stall Prevention during deceleration (L3-04 = 2) to control the DC bus voltage.
No. Name Setting Range Default
L3-20 DC Bus Voltage Adjustment Gain 0.00 to 5.00 1.00
Adjustment for Single Drive KEB 2 (L2-29 = 1) and Intelligent Stall Prevention During Deceleration
• Increase this setting slowly in steps of 0.1 if overvoltage or undervoltage occurs at the beginning of deceleration.
• Decrease this setting if there is a fair amount of speed or torque ripple.
Adjustment for Overvoltage Suppression
• Increase this setting slowly in steps of 0.1 if overvoltage suppression is enabled (L3-11 = 1) and a sudden increase in a
regenerative load causes an overvoltage fault.
• Decrease this setting if there is a fair amount of speed or torque ripple.
n L3-21: Accel/Decel Rate Calculation Gain
Determines the proportional gain used by overvoltage suppression (L3-11 = 1), Single Drive KEB 2 (L2-29 = 1), and Intelligent
Stall Prevention during deceleration (L3-04 = 2) to calculate acceleration and deceleration rates.
No. Name Setting Range Default
L3-21 Accel/Decel Rate Calculation Gain 0.10 to 10.00 1.00
Adjustment for Single Drive KEB 2 (L2-29 = 1) and Intelligent Stall Prevention During Deceleration
• Reduce L3-21 in steps of 0.05 if there is a fairly large speed or current ripple.
• Small reductions of L3-21 can help solve problems with overvoltage and overcurrent.
• Decreasing this setting too much can cause slow DC bus voltage control response and may also lengthen deceleration times
beyond optimal levels.
Adjustment for Overvoltage Suppression
• Increase this setting in steps of 0.1 if overvoltage occurs as a result of a regenerative load when overvoltage suppression is
enabled (L3-11 = 1).
• Decrease L3-21 in steps of 0.05 if there is a fairly large speed ripple when overvoltage suppression is enabled.
n L3-23: Automatic Reduction Selection for Stall Prevention during Run
Reduces the Stall Prevention during run level in the constant power range.
5.8 L: Protection Functions
250 YASKAWA SIEP YAIP1U 01B AC Drive - P1000 Technical Manual