Delta CT2000 Series, User Manual, Page: 372 / 634

Chapter 12 Description of Parameter Settings

CT2000 Series
12.2-00-10

Frequency Point when switch from I/F Mode to PM Sensorless Mode
Factory Setting:20.00
Settings 0.00~599.00Hz
 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 to I/F Mode
Factory Setting: 20.00
Settings 0.00~599.00Hz
 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)

I/F Mode and Low Pass-filter time of Id
Factory Setting: 0.2
Settings 0.0~6.0 sec
 The parameter is the filter time of Pr10-31. This can make the magnetic field of I/F increases
to current command value progressively and smoothly.
 If Id has to be higher slowly, then increase the parameter to avoid Step of current occurring
on start-up. If decrease (the minimum is 0) it, the speed of current to rise will be fast, and
occurs Step.

Voltage pulse width
Factory Setting:10
Settings 0~50 ms
 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.