No. Name Setting Range Default
L3-17
Target DC Bus Voltage for Overvoltage Suppression, and
Intelligent Stall Prevention During Deceleration
150 to 400
<1>
375 V
<1>
<2>
<1> Values are for 200 V class drives and must be doubled for 400 V class drives.
<2> This value is initialized when E1-01 is changed.
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L3-20: DC Bus Voltage Adjustment Gain
Determines the proportional gain used by overvoltage suppression (L3-11 = 1), Kinetic Energy Backup 2, and Intelligent Stall
Prevention during deceleration (L3-04 = 2) in order 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 KEB 2 and Intelligent Stall Prevention During Deceleration
• Increase this setting slowly in steps of 0.1 if overvoltage (ov) or undervoltage (Uv1) occurs at the beginning of deceleration
while KEB Ride-Thru 2 is enabled or Intelligent Stall Prevention during deceleration is activated.
• If this setting is too high, then a fair amount of speed or torque ripple can result.
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 results in an overvoltage (ov) fault.
• If this setting is too high, excessive speed or torque ripple can result.
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L3-21: Accel/Decel Rate Calculation Gain
Determines the proportional gain used by overvoltage suppression (L3-11 = 1), Kinetic Energy Backup 2, and Intelligent Stall
Prevention during deceleration (L3-04 = 2) in order 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 KEB 2 and Intelligent Stall Prevention During Deceleration
• Reduce the setting in steps of 0.05 if there is a fairly large speed or current ripple during KEB Ride-Thru 2 or when using
Intelligent Stall Prevention during deceleration.
• Small reductions in the acceleration gain can also help solve problems with overvoltage and overcurrent.
• Decreasing this setting too much can result in a 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).
• If there is a fairly large speed ripple when overvoltage suppression is enabled, then decrease L3-21 in steps of 0.05.
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L3-23: Automatic Stall Prevention Level Reduction
This function reduces the Stall Prevention during run level in the constant power range.
No. Name Setting Range Default
L3-23
Automatic Reduction Function Selection for Stall Prevention during
Run
0 or 1 0
Setting 0: Disabled
The level set in L3-06 is used throughout the entire speed range.
Setting 1: Enabled
The Stall Prevention level during run is reduced in the constant power range. The lower limit will be 40% of L3-06.
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Overvoltage Suppression Function
This function suppresses overvoltage faults by slightly increasing the output frequency when the DC bus voltage rises. It can
be used to drive loads with cyclic regenerative operation, such as punch presses or other applications that involve repetitive
crank movements.
5.8 L: Protection Functions
YASKAWA TOEP YAIQPM 03B YASKAWA AC Drive - iQpump Micro User Manual
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Parameter Details
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