2.10 n: Special Adjustment
490 YASKAWA TOEPYAIGA8002B GA800 Drive Programming
■ n3-13: OverexcitationBraking (OEB) Gain
No.
(Hex.)
Name Description
Default
(Range)
n3-13
(0531)
OverexcitationBraking
(OEB) Gain
Sets the gain value that the drive multiplies by the V/f pattern output value during overexcitation
deceleration to calculate the overexcitation level.
1.10
(1.00 - 1.40)
The V/f pattern output value goes back to its usual level after the motor stops or accelerates again to the frequency
reference speed.
The best value of this parameter changes when the flux saturation characteristics of the motor change.
• Gradually increase the value of n3-13 to 1.25 or 1.30 to increase the braking power of Overexcitation Deceleration.
If the gain is too much, the motor can have flux saturation and cause a large quantity of current to flow. This can
increase the deceleration time.
• Decrease the setting value if flux saturation causes overcurrent. If you increase the setting value, the drive can
detect oC [Overcurrent], oL1 [Motor Overload], and oL2 [Drive Overload]. Decrease the value of n3-21 [HSB
Current Suppression Level] to prevent oC and oL.
• Regular use of overexcitation deceleration or extended periods of overexcitation deceleration can increase internal
motor temperatures. Decrease the setting value in these conditions.
• If ov [Overvoltage] occurs, increase the deceleration time.
■ n3-14: OEB High Frequency Injection
No.
(Hex.)
Name Description
Default
(Range)
n3-14
(0532)
Expert
OEB High Frequency
Injection
Sets the function that injects harmonic signals during overexcitation deceleration.
0
(0, 1)
Enable this parameter to set a shorter deceleration time.
Note:
• If you frequently use overexcitation deceleration on a motor, the motor loss will increase the risk of burn damage.
• When you set this parameter to 1, the motor can make a loud excitation sound during overexcitation deceleration. If the excitation sound is
unwanted, set this parameter to 0 to disable the function.
0 : Disabled
1 : Enabled
The drive injects harmonic signals at the time of overexcitation deceleration. You can decrease the deceleration time
because motor loss increases.
■ n3-21: HSB Current Suppression Level
No.
(Hex.)
Name Description
Default
(Range)
n3-21
(0579)
HSB Current Suppression
Level
Sets the upper limit of the current that is suppressed at the time of overexcitation deceleration as a
percentage of the drive rated current.
100%
(0 - 150%)
If flux saturation during Overexcitation Deceleration makes the motor current become more than the value set in this
parameter, the drive will automatically decrease the overexcitation gain. If oC [Overcurrent], oL1 [Motor Overload],
or oL2 [Drive Overloaded] occur during overexcitation deceleration, decrease the setting value.
If repetitive or long overexcitation deceleration cause the motor to overheat, decrease the setting value.
■ n3-23: Overexcitation Braking Operation
No.
(Hex.)
Name Description
Default
(Range)
n3-23
(057B)
Overexcitation Braking
Operation
Sets the direction of motor rotation where the drive will enable overexcitation.
0
(0 - 2)
0 : Disabled
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