No. Name Setting Range Default
L3-17
Target DC Bus Voltage for Overvoltage Suppression, and
Intelligent Stall Prevention During Deceleration
150 to 400
<1>
370 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.
n
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.
n
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 0.00 to 200.00
1.00
<1>
<1> This value is reset to its default value when the control mode is changed (A1-02). The value shown here is for Open Loop Vector Control.
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.
n
L3-24: Motor Acceleration Time for Inertia Calculations
Sets the time it takes to accelerate the motor from stop to the maximum speed at motor rated torque. This parameter should
be set when using KEB Ride-Thru 2, Intelligent Stall Prevention during deceleration (L2-04 = 2), or the overvoltage
suppression function (L3-11 = 1).
No. Name Setting Range Default
L3-24 Motor Acceleration Time for Inertia Calculations 0.001 to 10.000
Determined by o2-04, E2-11, and
E5-01
<1>
<1> Parameter L3-24 is defaulted for a Yaskawa standard 4-pole motor. During Auto-Tuning, L3-24 will be initialized to a Yaskawa standard 4-
pole motor if parameter E2-11 is changed. This value also changes based on the motor code set to E5-01 when using the Open Loop Vector
Control Mode for PM motors.
Calculations are made as follows:
L3-24 =
2 J [kgm
2
] n [r/min]
60 T [Nm]
rated
rated
The rated torque can be calculated as follows:
60 P [kW] 10
3
2 n [r/min]
T [Nm] =
Motor
rated
rated
5.8
L: Protection Functions
196
SIEP C710606 20 OYMC AC Drive - V1000 User Manual
7/16/2008-13:23
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