1.9 n: Special Adjustments
YASKAWA ELECTRIC SIEP C710606 10A YASKAWA AC Drive - V1000 PRELIM. Programming Manual
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Note:
Parameter n2-02 cannot be set higher than n2-03 or an oPE08 error will result.
These parameters rarely need to be changed. Adjust settings only under the following
conditions.
• If hunting occurs, increase n2-02. If response is low, decrease it.
• Increase the setting of n2-03 if overvoltage (oV) failures occur with high inertia loads at
the end of acceleration or when the load changes radically.
• When increasing n2-02, make sure to increase C4-02 (Torque Compensation Delay Time
Constant 1) proportionally.
• When increasing n2-03, make sure to increase C4-05 (Torque Compensation Delay Time
Constant 2) proportionally.
◆
n3: High Slip Braking / Overexcitation Deceleration
High Slip Braking (V/f Control)
High Slip Braking (HSB) works in V/f Control only and is used to decrease the stopping
time compared to normal deceleration without using braking resistor options. HSB stops the
motor by reducing the output frequency in large steps, thus producing a high slip.
Regenerative energy created from decelerating the load is dissipated in the motor windings
through increased motor slip. Because of the increased temperature of the motor windings,
HSB should not be used for frequently stopping the motor. The duty cycle should be around
5% or less.
Notes on using High Slip Braking:
• The deceleration time that has been set is ignored during HSB.
• Braking time varies based on the load inertia and motor characteristics.
• HSB must be triggered by a digital input set to H1-
= 68. Once the HSB command is
given, it is not possible to restart the drive until the motor is stopped and the Run
command is cycled.
Use parameters n3-01 through n3-04 for adjusting HSB.
Overexcitation Deceleration (V/f Control and Open Loop Vector)
Overexcitation deceleration increases the flux during deceleration and allows shorter
deceleration time settings than with normal deceleration without the use of a braking
resistor. Enabled by setting L3-04 = 4.
Notes on Overexcitation Deceleration
No.
Name
Setting Range
Default
n2-02
AFR Time Constant 1
0 to 2000 ms
50 ms
n2-03
AFR Time Constant 2
0 to 2000 ms
750 ms
Summary of Contents for OYMC V1000
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