Delta Electronics VFD-EL series User Manual

Appendix C How to Select the Right AC Motor Drive|
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Revision 2016/03, 6ELE, V1.14
C-5
3. Explosion-proof (Ex) motor:
Needs to be installed in a safe place and the wiring should comply with the (Ex) requirements. Delta AC
Motor Drives are not suitable for (Ex) areas with special precautions.
4. Gear reduction motor:
The lubricating method of reduction gearbox and speed range for continuous operation will be different and
depending on brand. The lubricating function for operating long time at low speed and for high-speed
operation needs to be considered carefully.
5. Synchronous motor:
The rated current and starting current are higher than for standard motors. Please check before operation
and choose the capacity of the AC motor drive carefully. When 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):
AC motor drive Motor
180
155
140
100
80
55
38
0
3 20
60
120
60 seconds
Base freq.: 60Hz
V/F for 220V/60Hz
180
155
100
55
38
0
320
60
120
t
o
r
q
u
e
(
%
)
Frequency (Hz)
Frequency (Hz)
60 seconds
60 seconds
t
o
r
q
u
e
(
%
)
Base freq.: 60Hz
V/F for 220V/60Hz
130
140
100
85
45
35
0
3
20
50
120
180
150
100
45
35
0
50
120
68
80
torque (%)
t
o
r
q
u
e
(
%
)
60 seconds
60 seconds
Frequency (Hz)
Frequency (Hz)
3
20
Base freq.: 50Hz
V/F for 220V/50Hz
Base freq.: 50Hz
V/F for 220V/50Hz

Delta Electronics VFD-EL series Specifications

General

Brand	Delta Electronics
Model	VFD-EL series
Category	Media Converter
Language	English