Delta CT2000 Series User Manual page 378

 Increase the parameter if the input power has rapid change (ex. unstable electrical grid
makes voltage be insufficient in a sudden) while enter the field weakening re)gion, and ACR
diverges to cause oc (ex. during the application of Press, there are other Press is working,
and DC BUS decreases extremely in a sudden). If Id has spur and cause high frequency
noise of output current to be too big, then decrease the parameter to lower the noise, but
this also might cause a slow response.
Frequency Point when switch from I/F Mode to PM Sensorless Mode

Settings
 The parameter is the switch point which is from low frequency to high frequency. It will
influence high/low frequency area of speed observer.
 If the switch point is too low, motor will generate not enough back emf to let the speed
estimator measure the right rotator's position and speed, and cause stall and oc when the
frequency of switch point is running.
 If the switch point is too high, the active area of I/F will too wide, and then it will generate
larger current to make it cannot save energy. (The reason is that if the current of Pr10-31
sets too high, and the high switch point will make the drive keeps outputting with the setting
value of Pr10-31)
Frequency Point when Switch from PM Sensorless Observation Mode to

I/F Mode
Settings
 The parameter is the switch point which is from high frequency to low frequency. It will
influence high/low frequency area of speed observer.
 If the switch point is too low, motor will generate not enough back emf to let the speed
estimator measure the right rotator's position and speed, and cause stall and oc when the
frequency of switch point is running.
 If the switch point is too high, the active area of I/F will too wide, and then it will generate
larger current to make it cannot save energy. (The reason is that if the current of Pr10-31
sets too high, and the high switch point will make the drive keeps outputting with the setting
value of Pr10-31)
Voltage pulse width

Settings
 The angle detection is 3:6-pulse. The parameter influences the value of pulse during the
angle detection. The larger the pulse is, the higher of the accuracy of rotator's position. But it
might cause oc easily.
 Increase the parameter when the running direction and the command are opposite while
start-up. If oc occurs in the start-up moment, then decrease the parameter.
Chapter 12 Description of Parameter SettingsCT2000 Series
0.00~599.00Hz
0.00~599.00Hz
0~50 ms
12.2-00-16
Factory Setting:20.00
Factory Setting: 20.00
Factory Setting:10