Electronic Thermal Function - Omron 3G3JX Quick Start Manual

PROGRAMMING JX

3.13 Electronic thermal function

This function electronically protects the motor from overheating.
•
Causes an overload trip (E05) to protect the motor from overheating by setting according to the motor rated current.
•
Provides the most appropriate protection characteristics, taking into account the decline of a standard motor cooling capabil-
ity at a low speed.
•
To set a value over the rated current of the motor, be careful of any temperature rise of the motor.
Parameter
b012 Electronic thermal level
b212* 2nd electronic thermal level
b013 Electronic thermal characteristics selection
b213* 2nd electronic thermal characteristics
selection
Related parameters
* To switch to the 2nd control, allocate 08 (SET) to the multi-function input terminal and then turn it on.
Electronic thermal level (motor protection level)
(Example) 3G3JX-AB007, rated current: 4.0 A, setting range: 0.8 to 4.0 A.
Electronic thermal characteristics
Frequency characteristics are multiplied by the b012/212 set value above. The lower the output frequency is, the lower the cool-
ing capability of the standard motor's self-cooling fan.
•
Reduced torque characteristics 1 - Multiplied by the time limit characteristics set in b012/212 for each frequency.
•
Constant torque characteristics - Do not skip this setting when using a constant torque motor. Multiplied by the time limit
characteristics set in b012/212 for each frequency.
•
Reduced torque characteristics 2 - Multiplied by the limit characteristics set in b012/212 for each frequency.
Reduced torque
characteristics 1
Electronic thermal level Electronic thermal level
X1.0
X0.8
X0.6
0 5 20 60
JX Quick Start Guide
Parameter name
0.2 x Rated current to 1.0 x Rated current
00: Reduced torque characteristics 1
01: Constant torque characteristics
02: Reduced torque characteristics 2
C021
Time before trip (s)
60
4
0
4.6
6.0
(116%) (150%)
Constant torque
characteristics
Electronic thermal level
X1.0
X0.667
Inverter output
frequency (Hz)
5
0
Description
Example where electronic
thermal level is b012 = 5.0 A
Motor current (A)
(Ratio to the rated
8.0
(200%) current of the Inverter)
Electronic thermal level
X1.0
X0.8
Inverter output
frequency (Hz)
60
Reduced torque
characteristics 2
Inverter output
frequency (Hz)
0 20 60
23