• 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
n
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 (L3-04 = 2), or the overvoltage suppression function (L3-11 = 1).
No. Name Setting Range Default
L3-25 Load Inertia Ratio 0.0 to 1000.0 1.0
When set incorrectly, a fairly large current ripple can result during KEB Ride-Thru 2 and overvoltage suppression (L3-11
= 1) or other faults such as ov, Uv1, and oC may occur.
Parameter L3-25 can be calculated by:
L3-25 =
Machine Inertia
Motor Inertia
u
L4: Speed Agree/Frequency Reference Loss Detection
These parameters set up the speed agree and
speed detection functions which can be assigned to the multi-function output
terminals.
n
L4-01/02: Speed Agreement Detection Level and Detection Width
Parameter L4-01 sets the detection level for the digital output functions “Speed Agree 1”, “User Set Speed Agree 1”,
“Frequency Detection 1”, and “Frequency Detection 2”.
Parameter L4-02 sets the hysteresis level for these functions.
No. Name Setting Range Default
L4-01 Speed Agreement Detection Level 0.0 to 400.0 Hz 0.0 Hz
L4-02 Speed Agreement Detection Width 0.0 to 20.0 Hz 2.0 Hz
Refer to H2-01 to H2-03: Terminal MA/MB/MC, P1/PC and P2/PC Function Selection on page 186, Settings 2, 3, 4,
and 5.
n
L4-03/04: Speed Agreement Detection Level and Detection Width (+/-)
Parameter L4-03 sets the detection level for the digital output functions “Speed Agree 2”, “User Set Speed Agree 2”,
“Frequency Detection 3”, and “Frequency Detection 4”.
5.8 L: Protection Functions
216
YASKAWA ELECTRIC SIEP C710606 16C YASKAWA AC Drive – V1000 Technical Manual
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