12.9 n: SPECIAL
820 SIEPYEUOQ2A01G AC Drive Q2A Technical Manual
■ n8-21 Mot Back-EMF (Ke) Gain
No.
(Hex.)
Name Description
Default
(Range)
n8-21
(0554)
Expert
Mot 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)
■ n8-35 InitRotorPos Selection
No.
(Hex.)
Name Description
Default
(Range)
n8-35
(0562)
InitRotorPos Selection
Sets how the drive detects the position of the rotor at start.
Determined by A1-02
(1 - 3)
When A1-02 = 7 [Control Method = PM CLVector], the initial motor magnetic pole detection operates the first
time after the drive is energized. After that, the drive uses the encoder signal to calculate the rotor position and the
drive saves the value until the drive is de-energized.
1 : Pull-In
Starts the rotor with pull-in current.
2 : HiFreq Injection
Injects high frequency to detect the rotor position. This setting can cause a loud excitation sound when the motor
starts.
3 : Pulse Injection
Inputs the pulse signal to the motor to detect the rotor position.
Note:
• When you use an SPM motor, set this parameter to 1. Values between 1 to 3 can be selected if using IPM motors.
• If the drive incorrectly detects the polarity direction, the motor can rotate in the opposite direction of the Run command.
■ n8-36 HFI Signal Frequency
No.
(Hex.)
Name Description
Default
(Range)
n8-36
(0563)
HFI Signal Frequency
Sets the injection frequency for high frequency injection.
500 Hz
(200 - 5000 Hz)
PM Rotational Auto-Tuning and PM Stationary Auto-Tuning automatically calculate this parameter value.
■ n8-37 HFI Voltage Amplitude Level
No.
(Hex.)
Name Description
Default
(Range)
n8-37
(0564)
Expert
HFI Voltage Amplitude
Level
Sets the high frequency injection amplitude as a percentage where 400 V = 100% for a 400 V
class drives. Usually it is not necessary to change this setting.
20.0%
(0.0 - 50.0%)
Set n8-57 = 1 [High-Freq Injection = Enabled] to enable this parameter. When you do Auto-Tuning or Rotational
Auto-Tuning, the drive will automatically set this parameter.
Note:
When you change C6-02 [Carrier Frequency Selection], the drive automatically initializes this parameter. Set the carrier frequency you
will use, then do Auto-Tuning.
■ n8-39 HFI LPF Cutoff Frq
No.
(Hex.)
Name Description
Default
(Range)
n8-39
(0566)
HFI LPF Cutoff Frq
Sets the low-pass filter shut-off frequency for high frequency injection.
250 Hz
(0 - 1000 Hz)
Note:
• Set n8-35 = 1 [InitRotorPos Selection = Pull-In] or n8-57 = 1 [High-Freq Injection = ] to enable this parameter.
• The drive automatically calculates this value when High Frequency Injection Auto-Tuning completes successfully.
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