YASKAWA OYMC V1000, Programming Manual

Page: 206 / 408

1.8 L: Protection Functions
206 YASKAWA ELECTRIC SIEP C710606 10A YASKAWA AC Drive - V1000 PRELIM. Programming Manual
Adjustment for KEB 2 and Intelligent Stall Prevention During Deceleration
• Reduced 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 lengthens 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.
■
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).
Calculations are made as follows
where the rated torque can be calculated as follows:
■
L3-25: Load Inertia Ratio
Determines the ratio between the rotor inertia and the load. Set this parameter when using
KEB Ride-Thru 2, Intelligent Stall Prevention during deceleration (L2-04 = 2), or the
overvoltage suppression function (L3-11 = 1).
No.
<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.
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>
L3-24 =
2
π
J [
kgm
2
] n
rated
[
r/min
]
60 T
rated
[
Nm
]
60 P
Motor
[
kW
] 10
3
2
π
n
rated
[
r/min
]
T
rated
[
Nm
] =