Delta VFD300C43S-HS User Manual page 448

Chapter 12 Description of Parameter SettingsC2000-HS
 When the drive is running forward, if a sudden reverse run occurs and the reverse angle
exceeds the setting for Pr. 10-50, then a ScRv error occurs.
 This parameter is valid only when the setting of Pr. 07-28 =11 (enable textile machine).
 If the estimated tolerance of start-up angle detection is larger, and causes a reverse run of the
motor, this parameter can limit the reverse angle.
 Decrease the parameter setting to prevent large reverse angle. If the tolerance is bigger, then
increase the parameter setting. If the load is too large at this moment, it may cause oc.

Injection Frequency
Settings
 This parameter is a high frequency injection command in IPM sensorless control mode and
usually you do not need to adjust it. If a motor's rated frequency (for example, 400Hz) is too
close to the frequency setting for this parameter (that is, the Default of 500Hz), it affects the
accuracy of the angle detection. Refer to the setting for Pr. 01-01 before you adjust this
parameter.
 If the setting value for Pr. 00-17 is lower than Pr. 10-51*10, then increase the frequency of the
carrier wave.
 Pr. 10-51 is valid only when Pr. 10-53=2.

Injection Magnitude
Settings
 The parameter is the magnitude command for the high frequency injection signal in IPM
Sensorless control mode.
 Increasing the parameter can increase the accuracy of the angle estimation, but the
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 more accurate.
 Pr. 10-52 is valid only when Pr. 10-53=2.

PM Initial Rotor Position Detection Method
Settings
 Set to 2 for IPM; set to 3 for SPM. If these settings cause problems, then set the parameter to 1.

Magnetic Linkage Estimator Low-speed Gain
Settings 10–1000%
0–1200 Hz
0.0–200.0V
0: Disable
1: Internal 1/4 rated current attracting the rotor to zero degrees
2: High frequency injection
3: Pulse injection
12.1-10-11
Default: 500
Default: 30.0
Default: 0
Default: 100%