L4: Speed Agree/Frequency Reference Loss Detection - YASKAWA V1000 Technical Manual

5.8 L: Protection Functions
• 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.
L3-24 Motor Acceleration Time for Inertia Calculations
<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:
The rated torque can be calculated as follows:
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.
L3-25
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:
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.
L4-01
L4-02
Refer to H2-01 to H2-03: Terminal MA/MB/MC, P1/PC and P2/PC Function Selection on page
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".
216
Name
2
L3-24 =
T [Nm] =
rated
Name
Load Inertia Ratio
L3-25 =
Name
Speed Agreement Detection Level
Speed Agreement Detection Width
YASKAWA ELECTRIC SIEP C710606 16C YASKAWA AC Drive – V1000 Technical Manual
Setting Range
0.001 to 10.000
J [kgm 2 ] n [r/min]
rated
60 T [Nm]
rated
60 P [kW] 10 3
Motor
2 n [r/min]
rated
Machine Inertia
Motor Inertia
Default
Determined by o2-04, E2-11, and
E5-01
Setting Range
0.0 to 1000.0
Setting Range
0.0 to 400.0 Hz
0.0 to 20.0 Hz
186, Settings 2, 3, 4,
<1>
Default
1.0
Default
0.0 Hz
2.0 Hz