Delta VFD300C43S-HS User Manual page 507

II. PM Sensorless no-load/ light-load adjustment procedure
Start up with I/F mode
1. Increase d-axis current Pr.10-31
2. Increase the I/F switching
frequency Pr.10-39 & Pr.10-40
Fail to start the motor after tuning
the system inertia
(high-speed drive Ke < 25 V/krpm)
Start up with I/F mode
1. Increase d-axis current Pr.10-31
2. Increase the I/F switching
frequency Pr.10-39 & Pr.10-40
The speed vibration remains at
low-speed
(high-speed drive Ke < 25 V/krpm)
1. Increase high-speed gain
Pr.10-55
2. Decrease phase locked loop
PLL Kp Pr.10-56
The output frequency
fluctuates widely, or diverges
1. Increase high-speed gain Pr.10-55
2. Decrease phase locked loop PLL
Kp Pr.10-56
3. Increase carrier frequency Pr.00-17
The motor stalls at maximum
rotor speed
Chapter 12 Description of Parameter SettingsC2000-HS
8.No-load
Running
(a) Set frequency command
(b) Operating
A1.Started with
correct direction?
YES
9.Low-frequency no-
load Operation Test
YES
A2.Low-speed
NO
frequency operates
stably?
10.High-frequency No-
load Operation Test
YES
A3.Rated frequency
operates stably? The steady-state speed
YES
A4.If the motor reaches
the max. operation
frequency?
11.Load
Operation Test
12.2-00-37
Increase the system
inertia Pr.11-01
Momentary over current when
pressing RUN (ocA/ocn)
Start up with FOC mode
Increase the system inertia if the
motor operates with load,
decrease it if the motor operates
without load.
1. Increase system inertia Pr.11-01
2. Decrease ASR high-
frequency bandwidth Pr.11-04
fluctuates widely