12.10 n: Special Adjustment
1014 YASKAWA SIEPC71061737D GA800 Drive Technical Reference
The current flowing to the motor from the load can overheat the motor and cause burn damage to the motor. Set this
parameter to prevent burn damage to the motor.
■ 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.
• If you use overexcitation deceleration frequently or if you use overexcitation deceleration for an extended period of
time, it can increase motor temperature. 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 n3-
21, the drive will automatically decrease the overexcitation gain. If oC [Overcurrent], oL1 [Motor Overload], or oL2
[Drive Overload] 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)
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