Delta CT2000 Series User Manual page 385

Chapter 12 Description of Parameter SettingsCT2000 Series
sensorless FOC is successful if the motor runs smoothly. But if the motor runs
unsmoothly or low-frequency start up is failed, then refer to the following steps.
6. Set up Pr11-00-bit0=1, and adjust ASR parameter according to speed response.
Pr11-00-bit0 =1, ASR gain will auto adjust
Pr11-03 ASR1 low-speed bandwidth (When speed up in low speed cannot follow the
accel. command, increase the low-speed bandwidth)
Pr11-04 ASR2 high-speed bandwidth (When speed up in high speed cause vibration
or cannot follow the accel. Command, increase high-speed bandwidth)
Pr11-05 Zero-speed bandwidth (If the response of start-up is slow or incapable,
increase zero-speed bandwidth)
 The bigger setting value of ASR bandwidth is, the faster response is.
 It is suggested that low-speed bandwidth cannot be set too high, or the
observer will diverge.
7. Adjust the setting of FOC speed observer and per-unit value of inertia (common problems)
 Pr10-25: Set up FOC bandwidth of speed observer
Situation 1. Speed command changed rapidly, but speed response cannot follow.
Situation 2. The noise of observer is too large, and the running is diverged. (Speed
noise is too large→Decrease)
 Pr11-01: Set up per-unit value of inertia
Situation 1. When start- up, inrush current is too high in a sudden, and cause oc.
Situation 2. During the running or stop, OCN occurs and the motor runs randomly.
 Check Pr11-01 whether the per-unit of inertia is too large.
 Decrease Pr10-25 or Pr11-05.
PI
11-05
1. Need to know the inertia first
2. Set up 11- 00 bit0=1
11-03
11-04
5Hz
0Hz
(PI adjustment- Auto gain)
(Speed response is too slow→ Increase the setting value)
12.2-00-23
5Hz
Hz
11- 02