LSIS LSLV-S100 - Sensorless Vector Control for PM (Permanent-Magnet) Synchronous Motors

154
Learning Advanced Features
Problem
Relevant function code
Troubleshooting
The motor hunts when the
load increases from the base
frequency or higher.
Cn.22 ASR-SL I Gain1
Cn.23 ASR-SL I Gain2
Increase the value of Cn.22 by increments of
50m/s or decrease the value of Cn.24 by
decrements of 5%.
The motor hunts as the load
increases.
Cn.28 S-Est P Gain1
Cn.29 S-Est I Gain1
At low speed (10Hz or lower), increase the value
of Cn.29 by increments of 5.
At mid speed (30 Hz or higher), increase the
value of Cn.28 by increments of 500. If the
parameter setting is too extreme, over current
trip may occur at low speed.
The motor speed level
decreases.
bA.20 Auto Tuning
Select 6. Tr (static type) from bA. 24 and run
bA.24 Rotor time constant tuning.
*Hunting: Symptom of irregular vibration of the equipment.
5.11 Sensorless Vector Control for PM (Permanent-
Magnet) Synchronous Motors
Sensorless vector control is an operation that carries out vector control without rotation speed
feedback from the motor but, instead, with an estimation of the motor rotation speed calculated
by the inverter.
Group
Code
Name
LCD Display
Parameter Setting
Setting Range
Unit
dr
09
Control mode
Control Mode
6
PM Sensorless
-
-
14 Motor capacity Motor Capacity
Depends on the
motor capacity
0–15 -
18 Base frequency Base Freq
Depends on the PM
motor capacity
30–180 Hz
20 Maximum frequency Max Freq
Depends on the PM
motor capacity
40–180 Hz
bA
11
Motor pole number
Pole Number
4
2–48
-
13 Rated motor current Rated Curr
Depends on the
motor capacity
1–1000 A
15 Motor-rated voltage Rated Volt 220/380/440/480 170–480 V
16 Motor efficiency Efficiency
Depends on the
motor capacity
64–100 %
19
Motor input voltage
AC Input Volt
220/380
170–480
20
Auto tuning
Auto Tuning
7
All (PM)
-
32
Q-axis inductance
scale
Lq (PM) Scale 100% 50–150 %
34
Auto tuning level for
Ld and Lq
Ld,Lq Tune Lev 33.3% 20.0–50.0 %