Parameter Details
12
12.10 n: Special Adjustment
YASKAWA SIEPC71061753C GA500 Technical Manual 747
◆ n8: PM Motor Control Tuning
n8 parameters are used to make adjustments when controlling PM motors.
■ n8-01: Pole Position Detection Current
No.
(Hex.)
Name Description
Default
(Range)
n8-01
(0540)
Expert
Pole Position Detection
Current
Sets the Initial Rotor Position Estimated Current as a percentage where E5-03 [PM Motor Rated
Current (FLA)] = 100%. Usually it is not necessary to change this setting.
50%
(0 - 100%)
The drive uses the Initial Rotor Position Estimated Current to detect the initial position of rotors.
Use the "Si" value on the motor nameplate, if available.
■ n8-02: Pole Alignment Current Level
No.
(Hex.)
Name Description
Default
(Range)
n8-02
(0541)
Expert
Pole Alignment Current
Level
Sets the current at the time of polar attraction as a percentage where E5-03 [motor rated current]
is 100%. Usually it is not necessary to change this setting.
80%
(0 - 150%)
The drive uses the polar pull-in current to attract the rotor after it detects the initial rotor position. When you
increase the value of n8-02, the starting torque also increases.
• If the motor does not track correctly at the time of the polar attraction, increase the value in 10% increments.
• If the motor oscillates at the time of the polar attraction, decrease the value in 10% increments.
■ n8-11: Observer Calculation Gain 2
No.
(Hex.)
Name Description
Default
(Range)
n8-11
(054A)
Expert
Observer Calculation Gain
2
Sets the gain for speed estimation. Usually it is not necessary to change this setting.
Determined by n8-72
(0.0 - 1000.0)
Note:
When n8-72 = 0 [Speed Estimation Method Select = Method 1], the default value is 50.0. When n8-72 = 1 [Method 2], the default value
is 150.0.
■ n8-14: Polarity Compensation Gain 3
No.
(Hex.)
Name Description
Default
(Range)
n8-14
(054D)
Expert
Polarity Compensation
Gain 3
Sets the gain for speed estimation. Usually it is not necessary to change this setting.
1.000
(0.000 - 10.000)
■ n8-15: Polarity Compensation Gain 4
No.
(Hex.)
Name Description
Default
(Range)
n8-15
(054E)
Expert
Polarity Compensation
Gain 4
Sets the gain for speed estimation. Usually it is not necessary to change this setting.
0.500
(0.000 - 10.000)
■ n8-21: Motor Back-EMF (Ke) Gain
No.
(Hex.)
Name Description
Default
(Range)
n8-21
(0554)
Expert
Motor Back-EMF (Ke)
Gain
Sets the gain for speed estimation. Usually it is not necessary to change this setting.
0.90
(0.80 - 1.00)
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