11.10 n: Special Adjustment
992 YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual
■ n3-01: HSB Deceleration Frequency Width
No.
(Hex.)
Name Description
Default
(Range)
n3-01
(0588)
Expert
HSB Deceleration
Frequency Width
Sets how much the drive lowers the output frequency during high-slip
braking as a percentage where E1-04 [Maximum Output Frequency] =
100%.
5%
(1 - 20%)
When you must detect ov [DC Bus Overvoltage] during high-slip braking, set this parameter to a large value.
■ n3-02: HSB Current Limit Level
No.
(Hex.)
Name Description
Default
(Range)
n3-02
(0589)
Expert
HSB Current Limit
Level
Sets the maximum current output during high-slip braking as a percentage
where E2-01 [Motor Rated Current (FLA)] = 100%. Also set the current
suppression to prevent exceeding drive overload tolerance.
Determined by C6-
01, L8-38
(0 - 200%)
When you decrease the setting value for current suppression, it will make the deceleration time longer.
• When you must detect ov [DC Bus Overvoltage] during high-slip braking, set this parameter to a low value.
• If the motor current increases during high-slip braking, decrease the setting value to prevent burn damage in the
motor.
• The overload tolerance for the drive is 150% for Heavy Duty Rating (HD) and 110% for Normal Duty Rating
(ND).
■ n3-03: HSB Dwell Time at Stop
No.
(Hex.)
Name Description
Default
(Range)
n3-03
(058A)
Expert
HSB Dwell Time at
Stop
Sets the dwell time, a length of time when high-slip braking is ending and
during which the motor speed decreases and runs at a stable speed. For a set
length of time, the drive will hold the actual output frequency at the
minimum output frequency set in E1-09.
1.0 s
(0.0 - 10.0 s)
If there is too much inertia or when the motor is coasting to a stop after high-slip braking is complete, increase the
setting value. If the setting value is too low, machine inertia can cause the motor to rotate after high-slip braking is
complete.
■ n3-04: HSB Overload Time
No.
(Hex.)
Name Description
Default
(Range)
n3-04
(058B)
Expert
HSB Overload Time
Sets the time used to detect oL7 [High Slip Braking Overload], which
occurs when the output frequency does not change during high-slip braking.
Usually it is not necessary to change this setting.
40 s
(30 - 1200 s)
If a force on the load side is rotating the motor or if there is too much load inertia connected to the motor, the
drive will detect oL7.
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)
OverexcitationBrak
ing (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.
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