4-32
4-2 Function Mode
4
Functions
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.
* 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
Rated current: 4.0 A
Setting range: 0.8 to 4.0A
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.
Parameter No. Function name Data Default setting Unit
b012 Electronic thermal level
0.2 × Rated current to 1.0 × Rated current
Rated current A
*
b212
2nd electronic thermal
level
Rated current A
b013
Electronic thermal
characteristics selection
00: Reduced torque characteristics 1
01: Constant torque characteristics
02: Reduced torque characteristics 2
00 ⎯
*
b213
2nd electronic thermal
characteristics selection
00 ⎯
Related parameters C021, C024
Time before trip (s)
Example where electronic
thermal level is b012 = 5.0 A
Motor current (A)
(Ratio to the rated
current of the Inverter)
60
4
0
4.6
(116%)
6.0
(150%)
8.0
(200%)
Electronic thermal level
X1.0
X0.8
X0.6
0
520 60
Inverter output
frequency (Hz)
(Example) JX-AB007 (Rated current: 4.0 A), b012 = 4.00 (A),
Output frequency = 20 Hz
Trip time (s)
Motor current (A)
(Ratio to the rated current of the Inverter)
60
4
0
3.7
(92.8%)
4.8
(120%)
6.4
(160%)
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