Delta MS300 Series User Manual page 438

electromagnetic noise might be louder if the setting value is too high.
 The system uses this parameter when the motor's parameter is "Auto". This parameter
influences the angle estimation accuracy.
 When the ratio of the salient pole (Lq / Ld) is lower, increase Pr.10-52 to make the angle
detection accurate.
 Pr.10-52 is valid only when Pr.10-53 = 2.
10-53
Angle Detection Method

Settings
 Set to 2 for IPM; set to 3 for SPM. If these settings cause problems, then set the parameter to 1.
0: Disabled
1: Force attracting the rotor to zero degrees
2: High frequency injection
3: Pulse injection
Chapter 12 Descriptions of Parameter SettingsMS300
429
Default: 0