Delta Electronics VFD-M Series User Manual page 172

the AC motor drive operates more than one motor, please pay attention to starting and
changing the motor.
Power Transmission Mechanism
Pay attention to reduced lubrication when operating gear reduction motors, gearboxes, belts
and chains, etc. over longer periods at low speeds. At high speeds of 50/60Hz and above,
lifetime reducing noises and vibrations may occur.
Motor torque
The torque characteristics of a motor operated by an AC motor drive and commercial mains
power are different.
Below you'll find the torque-speed characteristics of a standard motor (4-pole, 15kW):
180
155
140
100
80
55
38
0 3 20
Frequency (Hz)
Base freq.: 60Hz
V/F for 220V/60Hz
140
130
100
85
68
45
35
0 3 20
Frequency (Hz)
Base freq.: 50Hz
V/F for 220V/50Hz
Revision May 2008, ME14, SW V3.04
Appendix CHow to Select the Right AC Motor Drive|
AC motor drive
60 seconds 60 seconds
60
120
60 seconds
50
120
Motor
180
60 seconds
155
100
55
38
0 3 20
60
Frequency (Hz)
Base freq.: 60Hz
V/F for 220V/60Hz
180
60 seconds
150
100
80
45
35
0
3 20 50
Frequency (Hz)
Base freq.: 50Hz
V/F for 220V/50Hz
120
120
C-7