Parameter Details
12
12.10 n: Special Adjustment
YASKAWA SIEPC71061737D GA800 Drive Technical Reference 1011
■ n2-02: Automatic Freq Regulator Time 1
No.
(Hex.)
Name Description
Default
(Range)
n2-02
(0585)
Automatic Freq Regulator
Time 1
Sets the time constant that sets the rate of change for the AFR function. Usually it is not necessary to
change this setting.
50 ms
(0 - 2000 ms)
Adjust this parameter in these conditions:
• If there is hunting or oscillation with a light load, increase the setting value in 50 ms increments and examine the
response. If the load inertia is large, increase the setting value in 50 ms increments and examine the response.
• If torque is not sufficient with a heavy load or if you must increase torque or speed responsiveness, decrease the
setting value in 10 ms increments and examine the response.
Note:
• Set n2-02 ≤ n2-03 [Automatic Freq Regulator Time 2]. If n2-02 > n2-03, the drive will detect oPE08 [Parameter Selection Error].
• When you change the value in n2-02, also change the value in C4-02 [Torque Compensation Delay Time] by the same ratio.
■ n2-03: Automatic Freq Regulator Time 2
No.
(Hex.)
Name Description
Default
(Range)
n2-03
(0586)
Automatic Freq Regulator
Time 2
Sets the time constant that sets the speed difference of the AFR function. Use this parameter for
speed searches or regeneration. Usually it is not necessary to change this setting.
750 ms
(0 - 2000 ms)
Adjust this parameter in these conditions:
• If the drive detects ov [Overvoltage] when acceleration stops under high-inertia loads, increase the setting value in
50 ms increments.
If the drive detects ov when the load changes suddenly, increase the setting value in 50 ms increments.
• To increase the responsiveness of torque and speed, decrease the setting value in 10 ms increments and examine the
response.
Note:
• Set n2-02 ≤ n2-03 [Automatic Freq Regulator Time 2]. If n2-02 > n2-03, the drive will detect oPE08 [Parameter Selection Error].
• When you change the value in n2-03, also change the value in C4-06 [Motor 2 Torque Comp Delay Time] by the same ratio.
◆ n3: High Slip Braking (HSB) and Overexcitation Braking
n3 parameters configure High Slip Braking and Overexcitation Deceleration.
■ High Slip Braking
High slip braking quickly decelerates motors without braking resistors.
This lets you stop a motor more quickly than with the ramp to stop processes. This function is best for applications
that do not frequently stop the motor, for example the fast stop function for high-inertia loads. Braking starts when the
MFDI for High Slip Braking (HSB) Activate [H1-xx = 68] activates.
Figure 12.143 High Slip Braking Time Chart
An induction motor is necessary to use high slip braking. Set A1-02 [Control Method Selection] to one of these values
to enable high slip braking:
• 0 [V/f Control]
• 1 [V/f Control with Encoder]
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