YASKAWA LA500 - C4: Torque Compensation

Parameter Details
12
12.3 C: Tuning
YASKAWA SIEPYEULA5001C LA500 Technical Manual 293
Figure 12.6 Slip Compensation Limit
■ C3-04: Slip Compensation at Regen
No.
(Hex.)
Name Description
Default
(Range)
C3-04
(0212)
Expert
Slip Compensation at
Regen
Sets the slip compensation function during regenerative operation.
0
(0 - 1)
If you apply a regenerative load when slip compensation function during regeneration is active, the quantity of
regeneration can increase immediately. In this condition, it is necessary to use a dynamic braking option (braking
resistor or braking resistor unit).
0 : Disabled
The drive does not provide slip compensation during regeneration.
The load and operation status (regenerative operation) can cause the motor speed to be higher or lower than the
frequency reference.
1 : Enabled Above 6Hz
Slip compensation function is enabled during regeneration. Slip compensation is disabled at output frequencies of
6 Hz or less.
■ C3-05: Output Voltage Limit Selection
No.
(Hex.)
Name Description
Default
(Range)
C3-05
(0213)
Expert
Output Voltage Limit
Selection
Sets the automatic reduction of motor magnetic flux when the output voltage is saturated.
0
(0, 1)
The drive will decrease flux and increase current to compensate torque when voltage is saturated. Make sure that
the drive has sufficient output current capacity before you enable this parameter. When this parameter = 1
[Enabled], the output current will increase by 10% at a maximum (at rated load) before it is enabled.
Enable this parameter to increase speed precision when you move heavy loads at high speeds in these conditions:
• Power supply voltage is low
• Motor rated voltage is high
Do not enable this parameter in these conditions:
• Operating a motor in the middle speed range or low speed range
• Power supply voltage is a minimum of 10% more than the motor rated voltage
When you enable this parameter, if the power supply voltage is much less than the motor rated voltage, torque
control will not be accurate.
0 : Disabled
1 : Enabled
◆ C4: Torque Compensation
Torque compensation is a function that increases voltage to increase output torque as compensation for
insufficient torque production at start-up or low-speed operation.
Voltage drops due to motor winding resistance cause torque generating voltage to decrease, which causes
insufficient torque. If the main circuit cable connecting the drive and motor is long, this can also cause insufficient
torque due to voltage drops.
V/f
OLV
V/f
OLV