Omron 3G3RX User Manual

4-47
4-2 Function Mode
4
Functions
Electronic Thermal Level (Motor Protection Level)
(Example) 3G3RX-A2150
Rated current: 64 A
Setting range: 12.8 A (20%) to 64.0 A (100%)
• The graph on the right shows the time limit
characteristics with the electronic thermal level
(b012) set to 64 A.
Electronic Thermal Characteristics
•The frequency characteristics are integrated with the above b012/b212/b312 set values.
•A general-purpose motor requires reduced load (current) because the lower the output frequency
is, the lower the cooling capability of its self-cooling fan.
•The reduced torque characteristics are designed to fit the heat radiation of a general-purpose
motor.
Reduced Torque Characteristics
Multiplied by the time limit characteristics set in b012/b212/b312 for each frequency.
Constant Torque Characteristics
Do not skip this setting when using a constant torque motor.
Trip time (s)
60
3.0
0
69.8
(109%)
96
(150%)
128
(200%)
Motor current (A)
(Ratio to the rated
current of the Inverter)
(Example) 3G3RX-A2150 (Rated current: 64 A), b012 = 64
(A)
, Base frequency = 60 Hz, Output frequency =
20 Hz
Tor que
x1.0
x0.8
x0.6
0
0
5
6
16
20
50
60
Inverter output
frequency (Hz)
Base frequency
Trip time (
s)
60
3.0
0
55.8
(87.2%)
76.8
(120%)
102.4
(160%)
Motor current (A)
(Ratio to the rated
current of the Inverter)
(Example) 3G3RX-A2150 (Rated current: 64 A),
b012 = 64 (A), Output frequency = 2.5 Hz
Tor que
x1.0
x0.8
x0.6
0 2.5
560
Inverter output
frequency (Hz)
Output current
value (A)
b020
b018
b016
0
b015 b017 b019 A004/A204/A304
Max. frequency (Hz)

Omron 3G3RX Specifications

General

Brand	Omron
Model	3G3RX
Category	DC Drives
Language	English