Electronic Thermal Function; Electronic Thermal Level (Motor Protection Level); Electronic Thermal Characteristics; Reduced Torque Characteristics - Omron JX User Manual

4-2 Function Mode

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 capability 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 No.
b012
*
b212
4
b013
*
b213
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) JX-AB007

Electronic Thermal Characteristics

•Frequency characteristics are multiplied by the b012/212 set value above.
•The lower the output frequency is, the lower the cooling 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.
Electronic thermal level
X1.0
X0.8
X0.6
0
4-32
Function name
Electronic thermal level
0.2 × Rated current to 1.0 × Rated current
2nd electronic thermal
level
Electronic thermal
00: Reduced torque characteristics 1
characteristics selection
01: Constant torque characteristics
2nd electronic thermal
02: Reduced torque characteristics 2
characteristics selection
Rated current: 4.0 A
Setting range: 0.8 to 4.0A
Time before trip (s)
60
4
0
4.6
(116%)
(Example) JX-AB007 (Rated current: 4.0 A), b012 = 4.00 (A),
Trip time (s)
Inverter output
frequency (Hz)
5 20 60
Data
C021, C024
Example where electronic
thermal level is b012 = 5.0 A
Motor current (A)
(Ratio to the rated
6.0 8.0
(150%) (200%) current of the Inverter)
Output frequency = 20 Hz
60
4
Motor current (A)
0
(Ratio to the rated current of the Inverter)
3.7
4.8 6.4
(92.8%)
(120%) (160%)
Default setting Unit
Rated current A
Rated current A
⎯
00
⎯
00