Parameter Details
12
12.10 n: Special Adjustment
YASKAWA SIEPC71061705H GA700 Series Technical Manual 933
◆ 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 [PM Motor Rated
Current (FLA)] = 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
you set the value too high, the drive will detect oL2 [Drive Overload].
• If the motor oscillates at the time of the polar attraction, decrease the value in 10% increments.
Note:
• When A1-02 = 7 [Control Method Selection = CLV/PM], do Rotational Auto-Tuning or Z Pulse Offset Tuning to enable this function.
■ n8-03: Pole Position Detection Time
No.
(Hex.)
Name Description
Default
(Range)
n8-03
(0542)
Pole Position Detection
Time
Sets the length of the Current Starting Time, which is used for Z Pulse Offset Tuning. Usually it is
not necessary to change this setting.
1.5 s
(1.5 - 5.0 s)
Sets the length of time of pull-in current when the drive detects the motor magnetic pole of the rotors.
Note:
If the motor oscillates at the time of the polar attraction, increase the value in 0.5 s increments. If the value is too high, the drive can
detect oL2 [Drive Overload].
■ n8-04: Pole Alignment Time
No.
(Hex.)
Name Description
Default
(Range)
n8-04
(0543)
Expert
Pole Alignment Time
Sets the length of the Polar Attraction Time, which is used for Z Pulse Offset Tuning. Usually it is
not necessary to change this setting.
1.5 s
(1.5 - 5.0 s)
Sets the length of time that the pull-in current flows when the drive detects the motor magnetic pole of the rotors.
Note:
If the motor oscillates at the time of the polar attraction, increase the value in 0.5 s increments. If you set the value too high, the drive
will detect oL2 [Drive Overload].
■ n8-11: Observer Calculation Gain 2
No.
(Hex.)
Name Description
Default
(Range)
n8-11
(054A)
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.
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