S6: Power Keb Function - YASKAWA T1000V Technical Manual

5.11 S: Functions for Textile Applications

◆ S6: Power KEB Function

S6 parameters determine how the Power KEB type of KEB operates. Power KEB is enabled when S4-01 is set to 3. It
uses machine inertia data for determining the deceleration rate needed to keep the DC bus voltage level at the value set in
parameter S4-11.
S6-01: DC Bus Capacity
■
Enter the size of any external capacitors that have been added to the drive to S6-01.
No.
S6-01
<1> Default setting depends on the control mode selection in parameter A1-02. The value shown here is for V/f Control.
Dependent Parameter Default Values on page
S6-02: Motor Acceleration Time
■
Enter the time required for the motor the drive is running to accelerate from zero up to the maximum frequency at the
rated torque. If setting in parameter E2-11 is changed by the user or by performing Auto-Tuning, then S6-02 will
automatically be set to the motor acceleration time of a standard Yaskawa 4-pole motor.
No.
S6-02
The motor acceleration time can be calculated using the formula below.
2π × J × Nr
S6-02 =
60 × T
100
GD 2
2
J [Kgm ] P Rated output [kW] Nr Rated speed [r/min] T
4
Use the following formula to find the rated torque.
60 × P × 10
3
T =
100
2π × Nr
S6-03: Load/Inertia Ratio
■
Enter the ratio between the inertia of the load and the inertia of the motor the drive is running. This parameter also adjusts
the functions, Stall Prevention during deceleration (L3-04 = 2), and overvoltage suppression (L3-11 = 1).
No.
S6-03
If S6-03 is set to the wrong value, a large current ripple may appear during Power KEB and during overvoltage
suppression. Problems may occur with overvoltage or undervoltage in the DC bus, and overcurrent.
The load/inertia ratio can be calculated using the following formula:
Machine inertia (excluding motor)
Load inertia ratio =
228
Name
DC Bus Capacity
364.
Name
Motor Acceleration Time
Name
Load/Inertia Ratio
Rotor inertia
YASKAWA ELECTRIC SIEP C710606 44B YASKAWA AC Drive T1000V Technical Manual
Setting Range
0 to 65000 μF
Setting Range
0.001 to 10.000 s
Rated torque [Nm]
100
Setting Range
0.0 to 1000.0
Default
1.00
<1>
Refer to Control Mode
Default
Determined by
o2-04, E2-11,
and E5-01
Default
1, 0