Electronic Thermal Level (Motor Protection Level); Electronic Thermal Characteristics; Reduced Torque Characteristics; Constant Torque Characteristics - Omron 3G3RX User Manual

4-2 Function Mode
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.
4
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.
Torque
x1.0
x0.8
x0.6
0 5
0 6

Constant Torque Characteristics

Do not skip this setting when using a constant torque motor.
Torque
x1.0
x0.8
x0.6
0 2.5 5
4-47
Inverter output
frequency (Hz)
16 50
20 60
Base frequency
Inverter output
frequency (Hz)
60
Trip time (s)
60
3.0
69.8
0
(109%)
(Example) 3G3RX-A2150 (Rated current: 64 A), b012 = 64
(A) Base frequency = 60 Hz
,
20 Hz
Trip time (s)
60
3.0
0 55.8 76.8
(87.2%) (120%)
(Example) 3G3RX-A2150 (Rated current: 64 A),
b012 = 64 (A), Output frequency = 2.5 Hz
Output current
value (A)
b020
b018
b016
0 b015 b017 b019 A004/A204/A304
Motor current (A)
96 128
(Ratio to the rated
(150%) (200%)
current of the Inverter)
Output frequency =
,
Motor current (A)
102.4
(Ratio to the rated
(160%)
current of the Inverter)
Max. frequency (Hz)