Parameter Details
12
12.8 n: Special Adjustment
YASKAWA SIEPYEULA5001C LA500 Technical Manual 345
12.8 n: Special Adjustment
n parameters set these functions:
• Function to prevent hunting
• High-slip braking
• Motor line-to-line resistance online tuning
• Fine-tune the parameters that adjust motor control
◆ n2: Speed Feedback Detection Control (AFR) Tuning
The speed feedback detection reduction function (or AFR: Automatic Frequency Regulator) helps the speed
become stable when you suddenly apply or remove a load.
Note:
Before you change n2-xx parameters, do one of these procedures:
• Set the motor parameters and V/f pattern correctly.
• Do Rotational Auto-Tuning.
■ n2-01: Speed Feedback Detection Control (AFR) Gain
No.
(Hex.)
Name Description
Default
(Range)
n2-01
(0584)
Speed Feedback Detection
Control (AFR) Gain
Sets the gain of the AFR function as a magnification value. Usually it is not necessary to change
this setting.
1.50
(0.00 - 10.00)
Adjust this parameter in these conditions:
• If hunting or oscillation occurs with light loads, increase the setting value in 0.05-unit increments and examine
the response.
• When torque is not sufficient with heavy loads or to make the torque or speed response better, decrease the
setting value in 0.05-unit increments and examine the response.
■ n2-02: Speed Feedback Detection Control (AFR) Time Constant 1
No.
(Hex.)
Name Description
Default
(Range)
n2-02
(0585)
Speed Feedback Detection
Control (AFR) Time
Constant 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. 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: Speed Feedback Detection Control (AFR) Time Constant 2
No.
(Hex.)
Name Description
Default
(Range)
n2-03
(0586)
Speed Feedback Detection
Control (AFR) Time
Constant 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.
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