N8: Pm Motor Control Tuning - YASKAWA L1000A Technical Manual

◆ n8: PM Motor Control Tuning

Parameters in the n8 group are used to adjust the Initial Rotor Pole Position Search function and other PM motor control
related functions like the current control loop in CLV/PM or voltage saturation prevention (voltage limit).
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Initial Rotor Pole Position Search Settings
When a PM motor with a non-absolute encoder such as an incremental encoder with a PG-X3 option is used, the drive
needs to search for the rotor pole position before it can operate the motor. This search is performed always:
• when the Up/Down command is issued for the first time after the power has been switched on.
• after one of the following errors occurred: dv1, dv2, dv3, dv4, dv6, dv7, PGo, PGoH.
• when an Up/Down command issued after the setting of parameter n8-35 had been changed.
With default settings the drive will generate a dv8 error if initial rotor pole position search fails (n8-86 = 1). The brake
control output (H2- = 50) will not open in this case.
When not using the drives brake sequence, include the Motor Pole Search Status signal (digital output programmed for
H2- = 61) so that the brake can open only if motor pole position search has been finished successfully. Refer to
Setting 61: Motor pole search status on page 196
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n8-01: Initial Polarity Estimation Current
Sets the current used for the initial rotor position estimation as a percentage of the motor rated current.
No.
n8-01
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n8-02: Pole Attraction Current
Sets the pull-in current used to detect rotor position. This setting rarely needs to be changed.
No.
n8-02
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n8-35: Initial Rotor Position Detection Selection
Selects how the rotor position is detected at start.
No.
n8-35
Setting 1: High Frequency Injection
High frequency is injected in order to detect the rotor position. Some noise may be generated from the motor at start.
Setting 2: Pulse injection
A pulse signal is injected into the motor in order to detect the rotor position.
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n8-36: High Frequency Injection Level
Sets the frequency level used for High Frequency Injection.
No.
n8-36
YASKAWA ELECTRIC SIEP C710616 38A YASKAWA AC Drive L1000A Technical Manual
for details.
Name
Initial Polarity Estimation Current
Name
Pole Attraction Current
Name
Initial Rotor Position Detection Selection
Name
High Frequency Injection
5.9 n: Special Adjustments
Setting Range Default
0 to 100%
Setting Range Default
0 to 150%
Setting Range Default
1 or 2
Setting Range Default
25 to 1000 Hz 500 Hz
50%
80%
1
5
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